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Mineralpedia Details for Scorodite

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Scorodite

Scorodite

Named for the Greek scorodion, meaning “garlic,” in reference to the garlicky smell Scoodite produces when heated.  From hundreds of occurrences, usually in small amounts, including Germany, the Czech Republic, Austria, England, Algeria, particularity large crystals from Namibia, Brazil, and Mexico, the USA, Japan, and Australia. Scorodite forms as a secondary mineral from the oxidation of arsenic-rich sulfides.

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

Formula
Fe3+AsO4·2H2
Crystal System
Orthorhombic 
Crystal Habit
Earthy, Granular, Fibrous 
Cleavage
Imperfect, Poor, Poor 
Luster
Vitreous - Greasy 
Color
yellowish green, pale leek green, liver brown, blue green, black green 
Streak
greenish white 
Class
Orthorhombic - Dipyramidal 
Fracture
Splintery 
Hardness
3.5-4 
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Scorodite from Bou Azzer dist., Anti-Atlas, Morocco

Scorodite
            from Bou Azzer dist., Anti-Atlas, Morocco This fantastic Scorodite specimen was illustrated in the Bou Azzer issue of the Mineralogical Record, Volume 38, number 5 on page 395. It is truly one of the more remarkable Scorodites around. The largest crystal measures 1cm. All of the crystals are very glassy and well formed and appear bluish green in natural sunlight and greenish under fluorescent lights. The digital camera captures a blue tone. It naturally sits well without aid and has no damage.
Click thumbnail images for larger view.

Scorodite from Mina Ojuela, Mapimi, Durango, Mexico

Scorodite
            from Mina Ojuela, Mapimi, Durango, Mexico

Bluish to green glassy crystals to 3mm.

Click thumbnail images for larger view.

Scorodite from Bull Moose mine, Custer Co., South Dakota, United States

Scorodite
            from Bull Moose mine, Custer Co., South Dakota, United States

Deep blue Scorodite crystals, less than 1cm.

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Scorodite from Hemerdon Consols, Plympton, Tavistock dist., Devon, England

Scorodite
            from Hemerdon Consols, Plympton, Tavistock dist., Devon, England

Light blue prismatic crystals to 2mm lining vugs in a seam of Quartz. These crystals color change from a light blue under incandescent lighting to a more vivid greenish blue natural sun light.

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SCORODITE from Trincheras, Sonora, Mexico

SCORODITE
            from Trincheras, Sonora, Mexico

Exceptional Scorodite cluster in matrix with a rich blue color, although that depends on the light source. Under the halogen lights used to take these photos the color is pretty close to that which you'll see in person under the sun. The crystals are to 1-2mm throughout the large 4cm vug.

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Scorodite from Tsumeb mine, Tsumeb, Namibia

Scorodite
            from Tsumeb mine, Tsumeb, Namibia

A thumbnail size specimen with a large 4mm pseudo-octahedral crystal perched nicely at the center of the sulfide matrix. As is typical of Scorodite, it displays the alexandrite effect in which the color changes from purple to blue depending on the light source.

Scorodite is a relatively common mineral typically occuring in decayed Arsenopyrite in a variety of geological environment. Large, well-formed crystals of Scorodite are uncommon.

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Scorodite from Gold Hill mine, Tooele Co., Utah, United States

Scorodite
            from Gold Hill mine, Tooele Co., Utah, United States

Bluish spheroidal crystal groups of good Scorodite to 0.3mm throughout gossan matrix.

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