View allAll Photos Tagged Quartz
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.
Arsenopyrite with Quartz. The mineral is iron arsenic sulfide. Siglo XX Mine. Llallagua, Bustillos Province, Potosi Department, Bolivia. (Collection of the Mines Museum of Earth Science. Golden, Colo.)
(~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
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
☞ See the original photo in 1st comment below. • Created with the Amazing Circles tool of dumpr.net. ∞ Rotated 180º.
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.
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 an unbroken crystal.
Locality:
Size: Field of View is about 2.5 inches
Information: www.ndk.com/catalog/AN-SQC_GG_e.pdf
This view shows the seed wafer. (Two parallel lines running horizontally.)
SC2-0040
325g
Quartz is commonly colored red or brown by crystals of iron-bearing minerals inside it. The green gemstone chrysoprase is colored by nickel.
Caland Pit
Atikokan, Ontario
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