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Calcite : CaCO3 | |
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Keweenaw Co., Michigan, USA Native copper matrix with overgrowth of colorless calcite crystals. The calcite protects the copper from oxidation, making the copper within the calcite bright color. All crystals complete and undamaged. Ex. Travis collection. Overall size of mineral specimen: 10x8x5 cm. Size of individual crystals: 3-8 mm. |
| © 2002 John H. Betts | Photo ID: 4553 View Count: 329 |
Calcite : CaCO3, Copper : Cu | |
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Keweenaw Co., Michigan, USA Thin crust (pseudomorphs?) of tan stilbite crystals with scalenohedral calcite crystals up to 12 mm. Inside the calcite crystals are bright native copper inclusions. No damage. Overall size of mineral specimen: 4x3x2 cm. Size of individual crystals: 1-12 mm. |
| © 2002 John H. Betts | Photo ID: 5092 View Count: 310 |
Calcite : CaCO3, Copper : Cu | |
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Keweenaw Co., Michigan, USA A 3cm calcite crystal on copper. Photographed by, and in the collection of, Karl Volkman |
| © Karl Volkman 10/07 | Photo ID: 131144 View Count: 88 |
Calcite : CaCO3, Copper : Cu | |
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Keweenaw Co., Michigan, USA A partial rhombic crystal on a native copper matrix and included with copper. 3.5cm X 2cm X 2.5cm |
| © Geoffrey Krasnov | Photo ID: 92308 View Count: 82 |
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Keweenaw Co., Michigan, USA This specimen was in the S.B. Whiting collection which was acquired by the academy over one hundred years ago. Though mostly a calcite specimen there is epidote and copper sprinked across the matrix. The calcite is very lustrous and translucent. An excellent opportunity to acquire a piece of history! Size: 55mm x 45mm x 30mm Collection: ... |
| © Collectors Edge | Photo ID: 134366 View Count: 76 |
Calcite : CaCO3, Copper : Cu | |
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Keweenaw Co., Michigan, USA Calcite with copper inclusions. 12cm in width. Smithsonian Museum of Natural History, Washington, D. C., USA. Photographed October 11, 2008. |
| © Joseph Polityka | Photo ID: 190237 View Count: 50 |
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Keweenaw Co., Michigan, USA 6.2 x 4.7 x 4.2 cm. A classic, old-time specimen from Michigan’s Copper Country. Copper in calcite pieces have always been one of the most sought after mineral species from this historic district. This superb piece features copper in calcite crystals on both sides of the gossan matrix, which is richly coated with two generations of epidote. The ... |
| © Rob Lavinsky | Photo ID: 209969 View Count: 41 |
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