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Mineralpedia Details for Gold

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Gold

Gold

Named from antiquity as the Old English word for the metal, and possibly related to the Sanskrit wok jval. The chemical symbol, Au, comes from the Latin word for gold, aurum. Gold is a common and widespread mineral in small amounts in rocks of many kinds as well as in sea water. It is found in epithermal veins, pegmatites, contact metamorphosed deposits, and in placers. Localities for fine specimens include in Russia, Romania, Australia, New Guinea, South Africa, Canada, the United States including famously here in the Black Hills of South Dakota at the Homestake mine, Venezuela, and Brazil. Hundreds of other minor localities.

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

Formula
Au 
Crystal System
Isometric 
Crystal Habit
Arborescent, Platy, Granular 
Cleavage
None, None, None 
Luster
Metallic 
Color
yellow, pale yellow, orange, yellow white, reddish white 
Streak
yellow 
Class
Isometric - Hexoctahedral 
Fracture
Hackly 
Hardness
2.5-3 
WebMineral
View Gold 
Mindat
View Gold 

Gold from Eagle's Nest mine, Placer Co., California, United States

Gold
            from Eagle's Nest mine, Placer Co., California, United States

Large leaf Gold to over 3.5cm.

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Gold from Harvard mine, Jamestown, Tuolumne Co., California, United States

Gold
            from Harvard mine, Jamestown, Tuolumne Co., California, United States

Brilliant leaf Gold to 2cm showing crystal outlines.

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Gold from Alpha mine, Lawrence Co., South Dakota, United States

Gold
            from Alpha mine, Lawrence Co., South Dakota, United States

Gold to 1mm in Deadwood Fm quartzite.

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Gold from Homestake mine, Lawrence Co., South Dakota, United States

Gold
            from Homestake mine, Lawrence Co., South Dakota, United States

A good example of how much of the ore was like at the Homestake mine. That is to say, tiny 1mm grains in Cummingtonite schist with Quartz.

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Gold from Santa Gertrudis mine, Sonora, Mexico

Gold
            from Santa Gertrudis mine, Sonora, Mexico

Coarse grained crystalline Gold strung out through siliceous sedimentary matrix.

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Gold from Red Lake mine, Balmertown, Ontario, Canada

Gold
            from Red Lake mine, Balmertown, Ontario, Canada

Leaf gold FOV 3cm.

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Gold from Bronzewing mine, Leinster, Western Australia, Australia

Gold
            from Bronzewing mine, Leinster, Western Australia, Australia

A 7mm long leaf Gold in Calcite matrix.

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Gold from Idaho pit, Kalgoorlie-Boulder, Western Australia, Australia

Gold
            from Idaho pit, Kalgoorlie-Boulder, Western Australia, Australia

Leaf gold to 3.5mm in quartz.

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