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Mineralpedia Details for Quartz

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Quartz

Quartz

The name for Quartz is believed to be first applied in the Middle Ages to gangue in Saxony, Germany, however the word itself is of obscure origin. Quartz in the most abundant mineral on the surface of the Earth and can be found in a number of environments including hydrothermal veins and metallic deposits, within granites and granite pegmatite, in sandstones, quartzite, and in carbonate rocks. There are hundreds of varieties of quartz which include chalcedonies, agates, and jaspers among others that differ in color, habits, inclusions, and impurities. There are tens of thousands of localities for quartz. Quartz is piezoelectric, develops a charge in response to pressure, and pyroelectric, develops a charge in response to heat and can also be triboluminescent, meaning it can generate light when broken.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/quartz.pdf

Formula
SiO2 
Crystal System
Trigonal 
Crystal Habit
Crystalline - Coarse, Druse, Crystalline - Fine 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
brown, colorless, violet, gray, yellow 
Streak
white 
Class
Trigonal - Trapezohedral 
Fracture
Conchoidal 
Hardness
WebMineral
View Quartz 
Mindat
View Quartz 

Quartz var. Opal from Yowah, Queensland, Australia

Quartz var. Opal
            from Yowah, Queensland, Australia

Flashing purple and blue internal reflections of Opal. 

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Quartz from Serra Negra, Patrocinio, Minas Gerais, Brazil

Quartz
            from Serra Negra, Patrocinio, Minas Gerais, Brazil

Group of opaque white sceptored Quartz crystals to 4cm long.

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Quartz from Lavra Da Ilha, Taquaral, Itinga, Minas Gerais, Brazil

Quartz
            from Lavra Da Ilha, Taquaral, Itinga, Minas Gerais, Brazil

Large pink or rose Quartz in a good crystal group with the largest at 1cm. This is a good clean specimen of rose Quartz from probably one of the best locailties in the worls.

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Quartz var. Amethyst from Piedras Parado, Tatatlia, Veracruz, Mexico

Quartz var. Amethyst
            from Piedras Parado, Tatatlia,  Veracruz, Mexico

Gorgeous purple Quartz variety Amethyst crystal points to 3cm with internal phantoms.

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Quartz variety Agate 'Teepee Canyon Agate' from Teepee Canyon, Black Hills, South Dakota, United States

Quartz variety Agate 'Teepee Canyon Agate'
            from Teepee Canyon, Black Hills, South Dakota, United States
Special Info
agate, teepee canyon agate

Beautiful multi-colored bands of the Teepee Canyon Agate found in the southern Black Hills.

Discovered by C. Lipp 2012

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QUARTZ from Abeville Co., South Carolina

QUARTZ
            from Abeville Co., South Carolina

A group of two amethyst crystals side by side.

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Quartz from Huaron mine, Huayllay, Pasco dept., Peru

Quartz
            from Huaron mine, Huayllay, Pasco dept., Peru

Colorless needle-like crystals of Quartz the longest to about 2.5cm with cubes of Pyrite on Sphalerite matrix.

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Quartz from Guerrero, Mexico

Quartz
            from Guerrero, Mexico

A nice group of 2-3cm amethyst crystals from the late June Zeitner collection purchased by Bill McConlogue.

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Quartz from Petersen Mountain, Washoe Co., Nevada, United States

Quartz
            from Petersen Mountain, Washoe Co., Nevada, United States

A nice light purple Quartz amethyst sceptor crystal to 4cm. Chipped on the very tip.

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QUARTZ from Hirukawa, Gifu Pref., Chubu, Honshu Island, Japan

QUARTZ
            from Hirukawa, Gifu Pref., Chubu, Honshu Island, Japan

A very dark smoky Quartz crystal floater. It really doesn't get much smokier than this! Poor photos but very nice in-hand. No damage. A good locality specimen.

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Quartz from Leiyang, Hunan prov., China

Quartz
            from Leiyang, Hunan prov., China

Just a nice cluster large cluster of Quartz crystals, the largest to 4cm with white Dolomite.

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Quartz from Black Pine mine, Philipsburg, Granite Co., Montana, United States

Quartz
            from Black Pine mine, Philipsburg, Granite Co., Montana, United States

A 1.3cm Japan-law twin of Quartz. 

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Quartz from Boulder Batholith, Silver Bow Co., Montana, United States

Quartz
            from Boulder Batholith, Silver Bow Co., Montana, United States

Two entries here: Smoky Quartz and Amethyst Quartz

Amethyst: This is a complex Quartz crystal with a lot of growth features to keep you busy studying exactly how it was formed. It is not a total floater with maybe an detachment point and is mostly amethyst with smoky at the base. The termination is better on the amethyst end and shows cavernous or negative growth with inclusions of a white clay. The prism faces are short. 

Smoky: Also found in the miarilitic cavities of the Boulder Batholith and collected by the late Chris van Laer. It is a good combination specimen with a small black Schorl crystal to 1cm. The smoky Quartz is 4cm and perched nicely on a Microcline crystal. The first photo is a good example of the color, while the others show you the crystal forms.

Amethyst: A very complex specimen with numerous doubly terminated crystals of both smoky and amethyst Quartz. All the crystals are in parallel growth. One end seems to be smokier than the other, which is more amethyst. Much of it seems to be in sceptor growth. The index catalog card from Chris's collection states that it was collected by Zach Johnson in 2004. 

Amethyst: A rich deep purple single crystal showing excellent skeletal growth on two faces. Excellent gemmy specimen. Obtained by Chris van Laer in 2004.

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Quartz from Elk Park, Jefferson Co., Montana, United States

Quartz
            from Elk Park, Jefferson Co., Montana, United States

A single excellent deep amethyst crystal to 2.5cm.

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Quartz from Bighorn Crags, Lemhi Co., Idaho, United States

Quartz
            from Bighorn Crags, Lemhi Co., Idaho, United States

Three very dark Quartz crystals to about 1.5cm on white Albite. Nice piece. Collected by Chris van Laer in July of 2003.

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Quartz from Crystal Park, Beaverhead Co., Montana, United States

Quartz
            from Crystal Park, Beaverhead Co., Montana, United States

A crystal clear light amethyst scepter. Excellent!

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Quartz from Timber Butte, Silver Bow Co., Montana, United States

Quartz
            from Timber Butte, Silver Bow Co., Montana, United States

Two very dark smoky Quartz crystals side-by-side, the longer one is 3.5cm. It is very lustrous, which does not show well in the photos. Collected by Chris van Laer in 1986.

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Quartz from Tadpole pegmatite, Toll Mtn area, Jefferson Co., Montana, United States

Quartz
            from Tadpole pegmatite, Toll Mtn area, Jefferson Co., Montana, United States

Excellent specimen of light smoky Quartz with a darker phantom in both crystals. There are two parallel smokies, the largest is to 3cm. It is very lustrous.

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Quartz from Pohndorf mine, Boulder Batholith, Jefferson Co., Montana, United States

Quartz
            from Pohndorf mine, Boulder Batholith, Jefferson Co., Montana, United States

Several crystal specimens with deep amethyst color strongly zoned at the pyramids and some doubly terminated.

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Quartz from Jefferson Co., Montana, United States

Quartz
            from Jefferson Co., Montana, United States

Gorgeous deep purple amethyst crystal to 2.5cm. Doubly terminated, color zoned.

A nice slender color Quartz crystal tipped by a light purple amethyst scepter. Collected by Chris van Laer.

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Quartz from Jeffrey Quarry, Pulaski Co., Arkansas, United States

Quartz
            from Jeffrey Quarry, Pulaski Co., Arkansas, United States

Nice aesthetic specimen with discoidal crystals of Ankerite to 9mm with waterclear Quartz. The largest Quartz is 3cm.

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Quartz var. amethyst from Hallelujah Junction, Washoe Co., Nevada, United States

Quartz var. amethyst
            from Hallelujah Junction, Washoe Co., Nevada, United States

Gemmy amethyst with shades of smoky scepter crystal. The clarity and color is great.

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Quartz from Beehive #8 peg., Boulder Batholith, Jefferson Co., Montana, United States

Quartz
            from Beehive #8 peg., Boulder Batholith, Jefferson Co., Montana, United States

A nice light smoky Quartz with excellent clarity and nice internal feathering.

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Quartz from Rader Creek, Jefferson Co., Montana, United States

Quartz
            from Rader Creek, Jefferson Co., Montana, United States

A very dark smoky Quartz single crystal with nice straitions and interesting terminations on both ends. 

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Quartz from Antreville, Abbeville Co., South Carolina, United States

Quartz
            from Antreville, Abbeville Co., South Carolina, United States

Highly lustrous with a light amethystine color and nice internal feathering. 

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Quartz from Goldflint Mtn., Jefferson Co., Montana, United States

Quartz
            from Goldflint Mtn., Jefferson Co., Montana, United States

A single roughly doubly terminated amethyst tipped crystal with interior smoky color. One end is well terminated with the other end roughly terminated with a small attachment point. The overall crystal is also shows a offset growth of another crystal. Collected by Chris van Laer in 2000.

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Quartz from Toll Mtn. area, Jefferson Co., Montana, United States

Quartz
            from Toll Mtn. area, Jefferson Co., Montana, United States

A scepter overgrowth of rich purple amethyst over a smoky Quartz. Very nice.

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Quartz from Beehive #2 peg., Boulder Batholith, Jefferson Co., Montana, United States

Quartz
            from Beehive #2 peg., Boulder Batholith, Jefferson Co., Montana, United States

Scepter with smoky in the neck and purple amethyst in the head. The amethyst is a good deep purple color and shows color zoning and clarity. 

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Quartz from Agate Creek, Queensland, Australia

Quartz
            from Agate Creek, Queensland, Australia

A beautiful specimen of rich red and greayish blue cut and polished Roselle agate. It is rough on one side.

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Quartz from White River beds, South Dakota, United States

Quartz
            from White River beds, South Dakota, United States

This is out of the June Culp Zeitner collection parts of which I obtained when she was still alive.  I don't know the exact location but it is out there somewhere. If you dig through her hundreds of articles you may find it. These pieces are a nice blue color. Most chalcedony out there is a dull grey or milky and colorless.

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Quartz var. amethyst from Dewey Rose mine, Elbert Co., Georgia, United States

Quartz var. amethyst
            from Dewey Rose mine, Elbert Co., Georgia, United States

Amethyst Quartz crystal with good color and Kaolinite(?) inclusions.

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Quartz var. amethyst from Basin Creek, Jefferson Co., Montana, United States

Quartz var. amethyst
            from Basin Creek, Jefferson Co., Montana, United States
Special Info
Collected by Chris van Laer in 1987.

Deep to light purple amethyst crystals in stacked and paralled growth on smoky Quartz. It is a fascinating specimen especially held up to a light and turning it about its axes. Collected by Chris van Laer in 1987.

Also an interesting specimen with a dark smoky, frosted stem capped by a purple amethyst about of equal width. 2.5cm.

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Quartz from Glittering Hill Addition, Toll Mtn, Jefferson Co., Montana, United States

Quartz
            from Glittering Hill Addition, Toll Mtn, Jefferson Co., Montana, United States

A very nice scepter of amethyst over a thin colorless Quartz stem. Collected by Chris van Laer in 1992.

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Quartz from Little Gem mine, Jefferson Co., Montana, United States

Quartz
            from Little Gem mine, Jefferson Co., Montana, United States

Double headed scepter, almost colorless, but with a slight amethyst color. Very excellent and rare. Collected by Chris van Laer himself in 1979.

An excellent specimen 2.5cm long, doubly terminated on the stem and the head scepter. The scepter is a very nice gemmy color. Collected by Chris van Laer in 1979.

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Quartz from São Paulo, Brazil

Quartz
            from São Paulo, Brazil

Purple amethyst cast of a former Quartz crystal.

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Quartz from Sulawesi, Indonesia

Quartz
            from Sulawesi, Indonesia

Light purple (less than photos depict) globular chalcedony group.

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Quartz from Dal'negorsk, Primorsky Kray, Russia

Quartz
            from Dal'negorsk, Primorsky Kray, Russia

Slender red Quartz crystals to 6cm. 

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