View allAll Photos Tagged Quartz
A quartz crystal etched in hydrofluoric acid (DANGER! don't try this at home!) and photographed with differential interference contract (DIC) microscopy.
Rhodochrosite and Quartz. Rhodochrosite is manganese carbonate. Emma Mine. Butte, Silver Bow Co., Montana. (Collection of the Mines Museum of Earth Science. Golden, Colo.)
Rock collection home photo experiments on a snowy lockdown day. Quartz is the most abundant mineral found at Earth's surface, and its unique properties make it one of the most useful natural substances.
Different types of hexagonal quartz crystals - Transparent rock crystals in the upper area - Amethyst Quartz in the lower left area and Smoky quartz in the lower right area of the frame.
Sample: Provided by Mr. Claudio Canut de Bon and Mr Carlos Aracena personal collections
Location: La Serena - IV Region - Chile
Quartz is the second most abundant mineral in the Earth's continental crust, after feldspar. It is made up of a continuous framework of SiO4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall formula SiO2.
There are many different varieties of quartz, several of which are semi-precious gemstones. Especially in Europe and the Middle East, varieties of quartz have been since antiquity the most commonly used minerals in the making of jewelry and hardstone carvings.
Varieties (according to color)
Figurine of a child carved in rock crystal, hittite, between 1500 and 1200 BC
Pure quartz, traditionally called rock crystal (sometimes called clear quartz), is colorless and transparent (clear) or translucent, and has often been used for hardstone carvings, such as the Lothair Crystal. Common colored varieties include citrine, rose quartz, amethyst, smoky quartz, milky quartz, and others. Quartz goes by an array of different names. The most important distinction between types of quartz is that of macrocrystalline (individual crystals visible to the unaided eye) and the microcrystalline or cryptocrystalline varieties (aggregates of crystals visible only under high magnification). The cryptocrystalline varieties are either translucent or mostly opaque, while the transparent varieties tend to be macrocrystalline. Chalcedony is a cryptocrystalline form of silica consisting of fine intergrowths of both quartz, and its monoclinic polymorph moganite.Other opaque gemstone varieties of quartz, or mixed rocks including quartz, often including contrasting bands or patterns of color, are agate, sard, onyx, carnelian, heliotrope, and jasper.
Citrine
Citrine is a variety of quartz whose color ranges from a pale yellow to brown due to ferric impurities. Natural citrines are rare; most commercial citrines are heat-treated amethysts or smoky quartzes. However, a heat-treated amethyst will have small lines in the crystal, as opposed to a natural citrine's cloudy or smokey appearance. It is nearly impossible to tell cut citrine from yellow topaz visually, but they differ in hardness.Brazil is the leading producer of citrine, with much of its production coming from the state of Rio Grande do Sul. The name is derived from Latin citrina which means "yellow" and is also the origin of the word "citron." Sometimes citrine and amethyst can be found together in the same crystal, which is then referred to as ametrine.
Rose quartz
An elephant carved in rose quartz, 10 cm (4 inches) long
Rose quartz is a type of quartz which exhibits a pale pink to rose red hue. The color is usually considered as due to trace amounts of titanium, iron, or manganese, in the massive material. Some rose quartz contains microscopic rutile needles which produces an asterism in transmitted light. Recent X-ray diffraction studies suggest that the color is due to thin microscopic fibers of possibly dumortierite within the massive quartz.
Additionally, there is a rare type of pink quartz (also frequently called crystalline rose quartz) with color that is thought to be caused by trace amounts of phosphate or aluminium. The color in crystals is apparently photosensitive and subject to fading. The first crystals were found in a pegmatite found near Rumford, Maine, USA, but most crystals on the market come from Minas Gerais, Brazil.
Rose quartz is not popular as a gem – it is generally too clouded by impurities to be suitable for that purpose.[citation needed] Rose quartz is more often carved into figures such as people or hearts.[citation needed] Hearts are commonly found because rose quartz is pink and an affordable mineral.[citation needed]
Amethyst
Amethyst is a popular form of quartz that ranges from a bright to dark or dull purple color. The world's largest deposits of amethysts can be found in Brazil, Mexico, Uruguay, Russia, France, Namibia and Morocco. Sometimes amethyst and citrine are found growing in the same crystal. It is then referred to as ametrine. An amethyst is formed when there is iron in the area where it was formed.
Smoky quartz
Smoky quartz is a gray, translucent version of quartz. It ranges in clarity from almost complete transparency to a brownish-gray crystal that is almost opaque. Some can also be black.
Milky quartz
Ancient Roman cameo onyx engraved gem of Augustus
Milk quartz or milky quartz may be the most common variety of crystalline quartz and can be found almost anywhere. The white color may be caused by minute fluid inclusions of gas, liquid, or both, trapped during the crystal formation. The cloudiness caused by the inclusions effectively bars its use in most optical and quality gemstone applications.
Quartz crystals and Moss mark the site of an ancient worked vein (Silver/Lead?) on Meliden Mountain / Graig Fawr.
Junk bus at the Pearsonville junkyard. Quartz Hill is near the high desert town of Lancaster. Visit the set page for more information.
Night, 2 minute exposure, full moon, red-gelled strobe, natural and green-gelled flashlight.
In geology, a vein is a distinct sheetlike body of crystallized minerals within a rock. Veins form when mineral constituents carried by an aqueous solution within the rock mass are deposited through precipitation. The hydraulic flow involved is usually due to hydrothermal circulation.
You can buy my postcards in here or buy me a coffee!
Photo by Girl Travel Factor
Bloodstone is a chert-like rock that is composed of cryptocrystalline quartz. It consists of a mix of deep green and deep red quartz. By itself, deep green cryptocrystalline quartz is called "plasma", and the deep red variety is called "jasper". Bloodstone, or "heliotrope", is plasma with spots or streaks or patches of jasper.
I have never in my life seen a bloodstone sample with provenance information. Surprisingly, there is little to no technical geologic literature on bloodstone - at least, none that is available and out in the open.
This specimen has zero information about its locality and geologic context. Many claim that most bloodstone comes from India. If this sample is Indian in origin, it is possibly derived from a fracture fill in Deccan Traps basalt lava flows (= Cretaceous-Tertiary boundary times), and possibly from the Kathiawar Peninsula in western India.
Bloodstone is also supposedly known from California and Italy.
I found this 7 mm yellow quartz crystal at the Palermo Mine in North Groton, New Hampshire in 2005. It is perched on albite (feldspar).
Quartz Crystal Snowflake - A stunning specimen on display shows how man made quartz can be lab-grown to precise conditions and forms. By Sawyer Technical Materials, shot through the glass display case at the Tucson Rock and Gem Show 2016. For more about the importance of quartz and technical research: www.sawyerllc.com/quartz.htm
Druse de quartz
Collection : W. FOUCHER
Hauteur : 16 cm
Provenance : Ouaco, Nouvelle-Calédonie
Stacking sur 8 clichés
Pyrite on Quartz. Pyrite is iron sufide. Garbutt Mine. Leadville, Lake Co., Colo. (On loan to the Colorado School of Mines Geology Museum. Golden, Colo.)
Locality: Le Bourg d'Oisans, Isere, France
Size: 50mm Wide
Part of the Gem and Mineral Hall Collection of the Natural History Museum of Los Angeles
Eidahl Collection
Malachite on Quartz. Malachite is hydrous copper carbonate. The quartz crystals are coated with iron oxide and possibly psilomelane. El Cobre Mine. Concepción del Oro, Zacatecas, Mexico.
Quartz var. Smoky. These clusters of crystals are found lining pockets in a fractured and weathered Cretaceous granodiorite. Hallelujah Claim. Petersen Mountain. Washoe Co., Nevada
Looking down to the Hudson River, all that white in the rocks is quartz. Dean and Tango had a great time exploring
From the Instamatic years, a poor view of an SD14 general cargo ship in the Dry Dock at Barry/Barry Island, transforming and being renamed from 'Welsh Endeavour' to 'Quartz'.
SD14 was a very successful standard design of general cargo ship, standing for Shelter Decker 14,000 tonnes deadweight (many later were nearer the 15,000t mark).
IMO 7314890
Built 1973 Austin & Pickersgill, Sunderland
9,201 grt
15,180t dwt
Scrapped 2001
I doubt you could get so close to a working ship-repair yard these days. Laid up BP Tankers of the Bird Class can be seen in the background.
Scanned Slide
1978
Don't they look pretty? These caught my eye when I went in to turn the lights off in my treatment room last night, they really sparkled in the light from the lamp.
This portion of the Highway 1 Kamloops to Alberta program involves replacing the two-lane bridge crossing at Quartz Creek, 40 km west of Golden, with a new four-lane bridge, access improvements to forest service roads and widening 4.4 km of two-lane highway to four lanes.