View allAll Photos Tagged quartzite
Sandstone in the Silurian of Tennessee, USA.
The Clinch Formation (a.k.a. Tuscarora Quartzite, Clinch Sandstone, Tuscarora Sandstone; Clinch Quartzite, Tuscarora Formation) generally consists of hard, well-cemented, quartzose sandstones and some quartz-pebble conglomerates. Commonly seen sedimentary features include cross-bedding and burrows. The quartz grains in the Clinch appear to have been recycled, probably several times during the Precambrian and Early Paleozoic. These sediments were deposited near the end of the Taconic Orogeny. The beds themselves were structurally tilted during the Allegheny Orogeny, in the Late Paleozoic.
Stratigraphy: Clinch Formation, Llandoverian Series, lower Lower Silurian
Locality: roadcut on the northern side of Rt. 25E, across the road from Veterans Overlook, near the top of Clinch Mountain, northeastern Grainger County, northeastern Tennessee, USA (36° 20' 02.41" North latitude, 83° 23' 37.39" West longitude)
this is an enormous gray-white quartzite slab, part of a long line of 60ft cliffs that line the valley in Dundonnell Forest.
pretty amazing to see it here, reminds me so much of the sparkling landscape of Yosemite.
the stone is covered with scored grooves, 'grated' by a flowing glacier.
..an amazing sight, and real juxtaposition aginst the red torridian sandstone of the An Teallach peaks.
better viewed large.
Wester Ross, Scotland
The Tasmanian endemic Xerochrysum collierianum (quartzite everlasting) flowering on rock outcrops on Mt Claude. This species was described in 2004 and is restricted to the west of the state where it occurs in rocky outcroppings of quartzite.
Quartzite from the Precambrian of the Transcontinental Arch, USA. (8.7 centimeters across at its widest)
Metamorphic rocks result from intense alteration of any previously existing rocks by heat and/or pressure and/or chemical change. This can happen as a result of regional metamorphism (large-scale tectonic events, such as continental collision or subduction), burial metamorphism (super-deep burial), contact metamorphism (by the heat & chemicals from nearby magma or lava), hydrothermal metamorphism (by superheated groundwater), shear metamorphism (in or near a fault zone), or shock metamorphism (by an impact event). Other categories include thermal metamorphism, kinetic metamorphism, and nuclear metamorphism. Many metamorphic rocks have a foliated texture, but some are crystalline or glassy.
Quartzite is a common, crystalline-textured, intermediate- to high-grade metamorphic rock. It forms by metamorphism of quartzose sandstones or siltstones. Quartzite can be entirely composed of interlocking quartz crystals, or the original sand grains may still be visible. This rock is hard (H = 7), will not bubble in acid (unlike marble), and can be almost any color.
The term “quartzite” has been used in geology to refer to crystalline, quartzose metamorphic rocks and to hard, well-cemented quartzose sandstones that have not been subjected to metamorphism. It is difficult to not call hard, well-cemented sandstones “quartzite” - for example, the Clinch Quartzite in the Appalachian Mountains and the Eureka Quartzite of the Great Basin in western USA, but the Clinch and Eureka aren’t metamorphic rocks. The term "metaquartzite" has been used by some geologists to refer to crystalline-textured, quartzose rocks that have been metamorphosed. This implies that “quartzite” be restricted to well-cemented, non-metamorphosed sandstones. I don’t often see the term metaquartzite in the geologic literature.
The quartzite sample seen here is from the Precambrian-aged Sioux Quartzite, which outcrops in southeastern South Dakota and southwestern Minnesota. Despite being regionally metamorphed, the unit’s original sedimentary features, such as horizontal stratification, cross-bedding, and ripple marks, are still apparent in some outcrops.
The Sioux Quartzite is a erosion-resistant unit in a long-lived paleotopographic high called the Sioux tectonic core. This high has existed since Precambrian times and is part of a northeast-southwest trending series of paleotopographic highs & depressions known as the Transcontinental Arch, which extends from Arizona to Minnesota (see Carlson, 1999).
Stratigraphy: Sioux Quartzite, upper Paleoproterozoic, 1.65 to 1.70 Ga
Locality: undetermined quarry; collected from railroad ballast at Missouri Valley, Iowa, USA
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Reference cited:
Carlson (1999) - Transcontinental Arch - a pattern formed by rejuvenation of local features across central North America. Tectonophysics 305: 225-233.
Otter Creek in the South Range of the Baraboo Ranges of Wisconsin, USA.
The gravel bars in this creek have abundant, large quartzite clasts derived from nearby outcrops of Baraboo Quartzite (for example, the upper part of the above photo). The Baraboo Ranges of southern Wisconsin are dominated by this hard, erosion-resistant Precambrian metamorphic unit. These rocks were originally marine sandstones and have been subjected to metamorphism and structural folding. Original sedimentary structures are preserved, such as cross-bedding and ripple marks. Baraboo Quartzites vary in color from pinkish to dark reddish to grayish. During metamorphism, quartz overgrowths formed over the original quartz sand grains. Long-term, modern weathering can result in original sand grains being released.
This unit has economic significance - it has been quarried historically and in modern times. The quartzite is broken down into gravel-sized pieces for use as railroad ballast and erosion-control rip-rap.
Stratigraphy: Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga
Locality: Baxter Hollow (a little downstream of bridge over Otter Creek), South Range of the Baraboo Ranges, southeastern Sauk County, southern Wisconsin, USA
That quartzite sarcophagus apparently holds five more ebony-and-lead coffins contained within one another like Russian dolls. It's taller than me even without the pedestal. Napoleon's followers must have had as much of a complex as he did!
Eriogonum brevicaule Nutt. var. laxifolium (Torr. & A. Gray) Reveal.
The geologic formation in this area of the canyon is the Precambrian-aged Big Cottonwood Formation containing tilting alternating layers of buff to red quartzite and shale ranging from black to purple to green, and it is said to be slightly metamorphosed. From about 900 million to 1 billion years ago, sand and clay were deposited by ocean tidal current and shoreline processes creating these layers. These are old rocks.
As currently circumscribed, this is a taxon that only occurs in Utah (except for a small extension into the southeastern corner of Idaho) and mainly on the western side of the Wasatch in northern Utah. [Dr. Stanley] Welsh even treats it as an endemic, although, it has also in the past been somewhat of a dumping ground for various things within the brevicaule complex.
Plants have more of a reddish tomentosum than other forms, flowering stems can be scapose as here, and the inflorescence can be either capitate (as here) or branched/divided. These plants are very different in appearance than var. brevicaule but it is difficult to describe that difference fully in words. The key taxonomic difference appears to be the stems which in var. brevicaule are glabrous whereas in var. laxifolium are not. What struck me was the geology and general beauty of the hidden location where these plants were growing, and their capitate heads (but that is not per se the taxonomic distinction). Var. brevicaule was also in flower in the general vicinity but not in the precise same location. Eriogonum umbellatum, well past flowering, was growing very near to this plant.
October 9, 2008, lower Big Cottonwood Canyon, Salt Lake County, Utah, elev. about 5,750 ft., in a relatively secluded and remote location about 300 feet above the flume.
Fuchsitic quartzite in the Precambrian of Wyoming, USA.
The quartzite seen here is richly infused with greenish fuchsite (= chromian muscovite mica). This is a small abandoned quarry where flaggy rocks were excavated for use as decorative stones (see Harris, 2003, p. 9).
Geologic unit: Elmers Rock Greenstone Belt, Archean, 2.54+ Ga
Locality: small abandoned quarry ~0.5 miles north of Tunnel Road, west of Squaw Mountain & south-southeast of Government Peak, eastern flanks of the Laramie Range, far-eastern Albany County, WSW of the town of Wheatland, southeastern Wyoming, USA (vicinity of 41° 55' 00.40" North latitude, 105° 17' 48.53" West longitude)
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Reference cited:
Harris (2003) - Decorative stones of southern Wyoming. Wyoming State Geological Survey Public Information Circular 42.
This Precambrian quartzite is from the Pecos Wilderness. Quartzite is metamorphosed standstone.
NOTE: The photo is public domain. Please credit U.S. Forest Service when used.
"The Cutting Wedge" – Christopher Lee, 1989, 488 East Valley Parkway and Hickory – A single tall wedge made of quartzite, laminated glass, and aluminum.
Quartzite in the Precambrian of Wisconsin, USA. (geology hammer for scale)
The Baraboo Ranges of southern Wisconsin are dominated by a hard, erosion-resistant Precambrian metamorphic unit called the Baraboo Quartzite. These rocks were originally marine sandstones and have been subjected to metamorphism and structural folding. Original sedimentary structures are preserved, such as cross-bedding and ripple marks. Baraboo Quartzites vary in color from pinkish to dark reddish to grayish. During metamorphism, quartz overgrowths formed over the original quartz sand grains. Long-term, modern weathering can result in original sand grains being released.
This unit has economic significance - it has been quarried historically and in modern times. The quartzite is broken down into gravel-sized pieces for use as railroad ballast and erosion-control rip-rap.
Stratigraphy: Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga
Locality: roadcut on the western side of Rt. 136, across the road from Van Hise Rock, just north of the town of Rock Springs, North Range of the Baraboo Ranges, north-central Sauk County, southern Wisconsin, USA (43° 29’ 21.35” North, 89° 54’ 57.39” West)
OLYMPUS DIGITAL CAMERA
Beach pebble from Port na Mheirlich with yellow quartzite and a metamorphic fusion of sedimentary sandstone coloured rock.
Lots of little abrasions in the softer rock from millions of years of collisions in the tides and storms.
Shaped and with colour that has rare beauty.
Focus stacked in camera. Interval 8/10
Macro studio lighting with white LEDs
White quartzite mountain in the La Cloche range in Northern Ontario Canada in late autumn with fall leaves with beaver pond and swamp.
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Quartzite lintel of Senusret III. Twelfth Dynasty, about 1850 BC. Provenance unknown, reused at Alexandria in the Roman period. Larger part of a monolithic lintel bearing a cartoche containing the 'prenomen' of Senusret III (originally at the centre of the block). On either side of the cartouche, a seated deity faced outwards to give the hieroglyphs of life, dominion and stability to the Horus name of the king, written in a rectangle (now lost) beneath the falcon of the god Horus. Above the surviving figure the inscription identifies the god as the incarnation of 'the souls of Heliopolis'. The city of Heliopolis, northeast of Cairo, was the cult centre of the sun-god, and the lintel may have belonged to a gateway in a Middle Kingdom temple on that site, destroyed in antiquity. Presented by the Earl Spencer, 1805. (British Museum)
Fuchsitic quartzite in the Precambrian of Wyoming, USA.
The quartzite seen here is richly infused with greenish fuchsite (= chromian muscovite mica). This is a small abandoned quarry where flaggy rocks were excavated for use as decorative stones (see Harris, 2003, p. 9).
Geologic unit: Elmers Rock Greenstone Belt, Archean, 2.54+ Ga
Locality: small abandoned quarry ~0.5 miles north of Tunnel Road, west of Squaw Mountain & south-southeast of Government Peak, eastern flanks of the Laramie Range, far-eastern Albany County, WSW of the town of Wheatland, southeastern Wyoming, USA (vicinity of 41° 55' 00.40" North latitude, 105° 17' 48.53" West longitude)
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Reference cited:
Harris (2003) - Decorative stones of southern Wyoming. Wyoming State Geological Survey Public Information Circular 42.
American Granite™ Mosaic Veneer, Wall Stone, Roughly Squared Roughly Rectangular, South Bay Quartzite® Roughly Squared Roughly Rectangular, Wall Stone, Fieldstone Wall Stone
Quartzite from the Precambrian of the Transcontinental Arch, USA. (8.7 centimeters across at its widest)
Metamorphic rocks result from intense alteration of any previously existing rocks by heat and/or pressure and/or chemical change. This can happen as a result of regional metamorphism (large-scale tectonic events, such as continental collision or subduction), burial metamorphism (super-deep burial), contact metamorphism (by the heat & chemicals from nearby magma or lava), hydrothermal metamorphism (by superheated groundwater), shear metamorphism (in or near a fault zone), or shock metamorphism (by an impact event). Other categories include thermal metamorphism, kinetic metamorphism, and nuclear metamorphism. Many metamorphic rocks have a foliated texture, but some are crystalline or glassy.
Quartzite is a common, crystalline-textured, intermediate- to high-grade metamorphic rock. It forms by metamorphism of quartzose sandstones or siltstones. Quartzite can be entirely composed of interlocking quartz crystals, or the original sand grains may still be visible. This rock is hard (H = 7), will not bubble in acid (unlike marble), and can be almost any color.
The term “quartzite” has been used in geology to refer to crystalline, quartzose metamorphic rocks and to hard, well-cemented quartzose sandstones that have not been subjected to metamorphism. It is difficult to not call hard, well-cemented sandstones “quartzite” - for example, the Clinch Quartzite in the Appalachian Mountains and the Eureka Quartzite of the Great Basin in western USA, but the Clinch and Eureka aren’t metamorphic rocks. The term "metaquartzite" has been used by some geologists to refer to crystalline-textured, quartzose rocks that have been metamorphosed. This implies that “quartzite” be restricted to well-cemented, non-metamorphosed sandstones. I don’t often see the term metaquartzite in the geologic literature.
The quartzite sample seen here is from the Precambrian-aged Sioux Quartzite, which outcrops in southeastern South Dakota and southwestern Minnesota. Despite being regionally metamorphed, the unit’s original sedimentary features, such as horizontal stratification, cross-bedding, and ripple marks, are still apparent in some outcrops.
The Sioux Quartzite is a erosion-resistant unit in a long-lived paleotopographic high called the Sioux tectonic core. This high has existed since Precambrian times and is part of a northeast-southwest trending series of paleotopographic highs & depressions known as the Transcontinental Arch, which extends from Arizona to Minnesota (see Carlson, 1999).
Stratigraphy: Sioux Quartzite, upper Paleoproterozoic, 1.65 to 1.70 Ga
Locality: undetermined quarry; collected from railroad ballast at Missouri Valley, Iowa, USA
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Reference cited:
Carlson (1999) - Transcontinental Arch - a pattern formed by rejuvenation of local features across central North America. Tectonophysics 305: 225-233.
British Museum (Free Museum) London England, Bloomsbury District
Eighteenth Dynasty, about 1400 BC from Thebes
Quartzites in the Precambrian of South Dakota, USA.
Extensive outcrops of pinkish, Paleoproterozoic-aged quartzites are present at Falls Park along the Big Sioux River in the city of Sioux Falls, South Dakota. The quartzites here have nicely water-worn, sculpted surfaces with good, fluvially abraded polish in places. These rocks are part of the Sioux Quartzite, which consists of 1.65 to 1.70 billion year old metamorphosed sandstones. Despite the metamorphism, original sedimentary features such as horizontal stratification, cross-bedding, and ripple marks are still preserved.
The Sioux Quartzite is an erosion-resistant unit in America’s midcontinent. It has formed a long-lived paleotopographic high since Precambrian times - the Sioux tectonic core. This high is part of a northeast-to-southwest trending series of paleotopographic highs & depressions known as the Transcontinental Arch, which extends from Arizona to Minnesota (see Carlson, 1999).
Quarries of Sioux Quartzite occur in southeastern South Dakota and southwestern Minnesota. The rocks are used as building stone, road gravel, sidewalk and paving gravel, and erosion control material.
Stratigraphy: Sioux Quartzite, upper Paleoproterozoic, 1.65-1.70 Ga
Locality: Falls Park, along the Big Sioux River in the town of Sioux Falls, southeastern South Dakota, USA
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Reference cited:
Carlson (1999) - Transcontinental Arch - a pattern formed by rejuvenation of local features across central North America. Tectonophysics 305: 225-233.