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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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Gold from Callaghan dist., Klamath Mtns., South of Yreka, California, United States

Gold
            from Callaghan dist., Klamath Mtns., South of Yreka, California, United States

Gold in serpentine. The gold does not actually surface, rather it seems to be in the foliations. 

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Gold from Emperor mine, Tavua Gold Field, Viti Levu, Fiji

Gold
            from Emperor mine, Tavua Gold Field, Viti Levu, Fiji

Wire gold throughout matrix. There does not appear to be any tellurides. The gold appears as 7 or more wires less than 1mm in length.

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Gold from Burns Creek, Mariposa Co., California, United States

Gold
            from Burns Creek, Mariposa Co., California, United States

5mm Gold in milky Quartz.

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Gold from Golden Slipper mine, Pennington Co., South Dakota, United States

Gold
            from Golden Slipper mine, Pennington Co., South Dakota, United States

2mm Gold in bluish to blackish Quartz.

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Gold from Excelsior Mountains, Mineral Co., Nevada, United States

Gold
            from Excelsior Mountains, Mineral Co., Nevada, United States

Quartz with a ring of leaf Gold 5mm across.

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Gold from Cotton Creek, Mariposa Co., California, United States

Gold
            from Cotton Creek, Mariposa Co., California, United States

Leaf gold in several areas up to 4mm across in milky Quartz.

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Gold from Oriental mine, Sierra Co., California, United States

Gold
            from Oriental mine, Sierra Co., California, United States

Spongy looking light Gold with a matrix of Arsenopyrite on the backside.

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Gold from Idarado mine, Telluride, San Miguel Co., Colorado, United States

Gold
            from Idarado mine, Telluride, San Miguel Co., Colorado, United States

Slab showing very rich mineralization of veinlet Gold in Quartz.

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Gold from Musselwhite mine, Skinner Lake Area, Kenora dist., Ontario, Canada

Gold
            from Musselwhite mine, Skinner Lake Area, Kenora dist., Ontario, Canada

Seldom seen Gold from this major deposit in Ontario. The Musselwhite is an underground mine with reserves of about 2 million ounces of Gold. Production in 2016 was about 260,000 ounces. It is one of the largest Gold mines in Canada. This specimen is very rich with leaf and strigers throughout the Quartz mass with a little Pyrrhotite.

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Gold from Bendigo, Victoria, Australia

Gold
            from Bendigo, Victoria, Australia

Accounts place Bendigo as the largest producer of Gold from 1850 to 1900. Alluvial gold depostits were some of the richest in the world. This specimen is obviously from the veins and lode deposits and shows spotty Gold along 7mm stringers and grains to 2-3mm. It is intimately associated with several sulfides: Pyrite, Arsenopyrite and Sphalerite.

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Gold from Caracota, Porco, Potosi, Bolivia

Gold
            from Caracota, Porco, Potosi, Bolivia

3mm leaf Gold on limonite matrix.

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Gold from Julcani mine, Julcani dist., Huancavelica dept., Peru

Gold
            from Julcani mine, Julcani dist., Huancavelica dept., Peru

Wire gold with some forms and branching to 5mm and Gold to about 1-2mm dispersed throughout Quartz matrix with black Ferberite. 

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