View allAll Photos Tagged Quartz
Chalcopyrite-sphalerite-pyrite-quartz from Romania (public display, Carnegie Museum of Natural History, Pittsburgh, Pennsylvania, USA)
A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are over 5600 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates.
The sulfide minerals contain one or more sulfide anions (S-2). The sulfides are usually considered together with the arsenide minerals, the sulfarsenide minerals, and the telluride minerals. Many sulfides are economically significant, as they occur commonly in ores. The metals that combine with S-2 are mainly Fe, Cu, Ni, Ag, etc. Most sulfides have a metallic luster, are moderately soft, and are noticeably heavy for their size. These minerals will not form in the presence of free oxygen. Under an oxygen-rich atmosphere, sulfide minerals tend to chemically weather to various oxide and hydroxide minerals.
Chalcopyrite is a copper iron sulfide mineral (CuFeS2). Many pyrite-like minerals exist, such as pyrite, marcasite, arsenopyrite, pyrrhotite, and chalcopyrite. Chalcopyrite has a metallic luster, a deep yellowish-brassy color, a dark gray streak, a hardness of about 3.5 to 4, and no cleavage. Many specimens have a multicolored iridescent tarnish, which can be artificially produced by exposure to certain chemicals (often acid). Chalcopyrite is an important copper ore mineral.
Locality: Boldut Mine, Cavnic, Romania
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Photo gallery of chalcopyrite:
Normal lighting on left and back-lit on right.
Locality: Irai, Alto Uruguay REgion, Rio Grande do Sul, Brazil
Size: Specimen is
Quartz/Pyrite, Shangbao, Hunan, China.
Seen in "Terra Mineralia", Freiberg, Germany, one of the largest collections of minerals worldwide.
Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). It is the second most abundant mineral in Earth's continental crust, behind feldspar. There are many different varieties of quartz, several of which are classified as gemstones. Since antiquity, varieties of quartz have been the most commonly used minerals in the making of jewelry and hardstone carvings, especially in Europe and Asia.
Manganese oxide powdered quartz crystals from a vug at the Mesquite Gold Mine in southeastern California
Main parts of my small collection of stones, picked on the Pacific beaches, not including fossils, jasper and various unidentified stones.
Other name for it is Scolecite
Locality: Fat Jack Mine, ane Mountain, Crown King, Pine Grove District, Bradshaw Mts (Bradshaw Range), Yavapai Co., Arizona, USA
Size: Crystal is 1.4 inches tall.
Subject: Rock, quartz
If you see any visions from gazing into this crystal I am not liable for any direct, indirect, or incidental, consequential, real, imagined or punitive damages arising from entering a trance. Here is the link to the original size: farm3.static.flickr.com/2657/4180306484_37c5d71ac7_o.jpg
Canon 100mm macro lens, 1/60 sec, f/4.5, ISO 100 Single 100W incandescent light left of quartz crystal. Manual Focus with focal plane inside of crystal. Used Lightroom to saturate and bring out the hues of the light reflecting of inside of the grain structure of the crystal lattice.
At the Gem Rock museum in Creetown - www.gemrock.net/
PS - the smallest of those is 6 inches long, absolutely amazing!
Small but ultra-clear crystals. Very hard to photograph because they are so clear. About 3-4mm long. Waitawheta River, Karangahake Gorge.
Twinned quartz from Madagascar.
A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are over 5100 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates.
The silicates are the most abundant and chemically complex group of minerals. All silicates have silica as the basis for their chemistry. "Silica" refers to SiO2 chemistry. The fundamental molecular unit of silica is one small silicon atom surrounded by four large oxygen atoms in the shape of a triangular pyramid - this is the silica tetrahedron - SiO4. Each oxygen atom is shared by two silicon atoms, so only half of the four oxygens "belong" to each silicon. The resulting formula for silica is thus SiO2, not SiO4.
The simplest & most abundant silicate mineral in the Earth's crust is quartz (SiO2). All other silicates have silica + impurities. Many silicates have a significant percentage of aluminum (the aluminosilicates).
Quartz (silicon dioxide/silica - SiO2) is the most common mineral in the Earth's crust. It is composed of the two most abundant elements in the crust - oxygen and silicon. It has a glassy, nonmetallic luster, is commonly clearish to whitish to grayish in color, has a white streak, is quite hard (H≡7), forms hexagonal crystals, has no cleavage, and has conchoidal fracture. Quartz can be any color: clear, white, gray, black, brown, pink, red, purple, blue, green, orange, etc.
The specimen shown above is Japan-law twinned quartz of hydrothermal origin, derived from a breccia body.
Locality: unrecorded/undisclosed site north of the town of Andilamena, northern Toamasina Province, northeastern Madagascar
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Photo gallery of quartz:
(Pra129) Prasiolite Quartz (Brazil). 7.89ct, 12.15x12.17x9.31mm. Custom Barion Square.
I purchased this from a Brazilian dealer in Tucson. I paid a small premium for this color -- described as "super extra" at the dealer's booth. It is a little nicer than the normal prasiolite in that it lacks much of the gray mask most of these stones have.
I'm pretty pleased with this design too -- I think I'll use it again in some other materials.
(~1.95 centimeters across at its widest)
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"Dendritic agate" is a rockhound term applied to fine-grained quartz / chalcedony having dark-colored, irregularly-shaped to branching inclusions of one or more opaque minerals.
Locality: unrecorded / undisclosed
While this piece doesn't span as wide as some of my earlier work, I've spent more hours on it than any gear-less piece so far. This is due to a lot of detailed carving, specifically on the dial; and the machining of the very solid casing, and dial ring. For the motor casing, and the ring around the parameter of the dial, I used thick bronze piping, typically used for industrial bearings. This almost completely dampens the commercial clock motor, which can otherwise be distractingly noisy. Because pipe was used, rather than sheet, I could make the dial a lot deeper. This allowed for the interesting effect of one hand passing behind the decorative curl on the top of the clock, while the other passes in front.
The atypical horizontal design of this piece makes it perfect for placement over doorways or mantles, but it has the detail and interest to be viewed up close at eye level.
Materials - Brass and bronze.
Dimensions - 19 1/4" wide x 5 1/2" tall x 2" deep.
Every PAL colour TV has one of these 64-microsecond delay lines. Video recorders have them, too. They compensate for phase errors in the colour subcarrier and prevent the display of false colours.
Quartz Peak cirque in the Niut Range seen from the north slopes of Peak 9560. Our basecamp was at the bottom of the photo. This thing was mapped as a glacier but it's all moraine now! :o
A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are over 5600 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates.
The silicates are the most abundant and chemically complex group of minerals. All silicates have silica as the basis for their chemistry. "Silica" refers to SiO2 chemistry. The fundamental molecular unit of silica is one small silicon atom surrounded by four large oxygen atoms in the shape of a triangular pyramid - this is the silica tetrahedron - SiO4. Each oxygen atom is shared by two silicon atoms, so only half of the four oxygens "belong" to each silicon. The resulting formula for silica is thus SiO2, not SiO4.
The simplest & most abundant silicate mineral in the Earth's crust is quartz (SiO2). All other silicates have silica + impurities. Many silicates have a significant percentage of aluminum (the aluminosilicates).
Quartz (silicon dioxide/silica - SiO2) is the most common mineral in the Earth's crust. It is composed of the two most abundant elements in the crust - oxygen and silicon. It has a glassy, nonmetallic luster, is commonly clearish to whitish to grayish in color, has a white streak, is quite hard (H≡7), forms hexagonal crystals, has no cleavage, and has conchoidal fracture. Quartz can be any color: clear, white, gray, black, brown, pink, red, purple, blue, green, orange, etc.
The quartz seen here is a broken specimen - no obvious crystal faces are present.
45 mm environ, le gros cristal en haut mesure 15 mm.
Collection privée.
Zoom Sigma 17-70mm F2,8-4 DC HSM Macro.
Quartz Japanese Law Twin
Locality: Washington Camp, Arizona
43g w/base
Crystal is 2.1 inches wide.
SC2-0011
Fluorite with coating of druzy Quartz
SC2-3126
This is a closer view of:
www.flickr.com/photos/usageology/49552941876/in/photostream/
This fluorite crystal has a portion of the druzy quartz coating missing.
Quartz with inclusions. This stone is interesting as the inclusions are all in one very shallow plane.
Petit... mais costaud!
"Le quartz opale pour l'aura a une couleur arc-en-ciel plus pâle que celle produite par le platine. De même que l'apparition d'un arc-en-ciel suscite l'espoir et l'optimisme, ce cristal apporte la joie. Purifie et équilibre tous les chakras, intègre le corps de lumière dans la dimension physique. Permet d'accéder à un profond état de conscience méditative, ancrant l'information reçue dans le corps physique. Induit un état d'union totale à travers la conscience cosmique." (Judy Hall "La bible des minéraux" chez france loisirs). Fortifiant du thymus et du système immunitaire.
From Island Ave, Peaks Island (in Casco Bay), Maine USA • Orange sunset. Another arch rises on the deck; all from quartz and quartzite. I've been building miniature, windowed Inukshuk, for some time; finally, arches.