Calumet, Houghton Co., Michigan, USA

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Copper : Cu, Calcite : CaCO₃
	Calumet, Houghton Co., Michigan, USA Translucent calcite with native copper inclusions. The calcite prevents the copper from oxidizing, keeping the copper a bright metallic color. Overall size of mineral specimen: 5x5x3.5 cm. Size of individual crystals: 3-10 mm.
© 2001 John H. Betts	Photo ID: 682 View Count: 390
Copper : Cu
	Calumet, Houghton Co., Michigan, USA Overall size: 55 x 34 x 18 mm - Photo and collection Antonio Borrelli.
© Antonio Borrelli	Photo ID: 37292 View Count: 225
Copper : Cu
	Calumet & Hecla Mine, Calumet, Houghton Co., Michigan, USA The aesthetics of this piece are absolutely incredible! The specimen features a well-formed, large 8+ cm tetrahexahedral copper crystal perched above a matrix of massive to crystallized copper. Several smaller 3 to 4 cm copper crystals, also, grace the matrix. Perhaps most interestingly, a â€œcopper skull" about 5 cm in length sits ...
© Collectors Edge	Photo ID: 69708 View Count: 193
Copper : Cu
	Calumet, Houghton Co., Michigan, USA Sample (Not crystallized) with 17cm - December of 1998
© Martins da Pedra	Photo ID: 40167 View Count: 189
Copper : Cu
	Calumet, Houghton Co., Michigan, USA A wonderfully sculptural old Michigan copper out of the Hauck Collection. This completely crystallized specimen shows stunning crystal form from all directions! As the pics show -- truly exceptional! 7.1 x 5.9 x 4.6cm
© Rob Lavinsky	Photo ID: 57096 View Count: 159
Copper : Cu, Datolite : CaB[OH\|SiO₄]
	Calumet, Houghton Co., Michigan, USA This is a fascinating old Michigan specimen, to me. What you have is a very large specimen of datolite, infused with copper so that it is actually tinted a coppery color - and, surrounded by copper-rich ore. Datolites have become so sought-after and hard to obtain, for whatever reason. Though they do not compete in aesthetics with a fine crystal ...
© Rob Lavinsky	Photo ID: 57080 View Count: 158
Copper : Cu
	Red Jacket shaft, Calumet & Hecla Mine, Calumet, Houghton Co., Michigan, USA 12.0 x 11.0 x 8.5 cm. An IMPRESSIVE and DRAMATIC CABINET copper "skull" from the Red Jacket Shaft of the Calumet and Hecla Mine, near Calumet, Michigan. This is a very 3-dimensional cast, with the copper forming around conglomerate cobbles. The cobbles were dissolved away and further tectonic activity caused the back of the cast or "skull" to bend ...
© Rob Lavinsky	Photo ID: 118176 View Count: 129
Copper : Cu
	Red Jacket shaft, Calumet & Hecla Mine, Calumet, Houghton Co., Michigan, USA From the Red Jacket Shaft of Calumet & Hecla Mine near Calumet, MI. The specimen measures 7 cm across and is crystalized. The specimen was found in July of 2003 by the photographer.
© Paul T. Brandes	Photo ID: 158078 View Count: 98
Copper : Cu
	Calumet & Hecla Mine, Calumet, Houghton Co., Michigan, USA 10.8 x 9 x 6 cm. Copper has a beauty all its own, and this large specimen has well-crystallized Copper intermixed and on calcite. The patina is also very good. Many of the crystals range from 1-2 cm in size, which is outstanding given the sharpness as well. An excellent specimen from one of the world’s great localities.
© Rob Lavinsky	Photo ID: 117559 View Count: 89
Copper : Cu
	Calumet & Hecla Mine, Calumet, Houghton Co., Michigan, USA A hackly 3.2 x 2.3 x 4.6 cm grouping of native copper, one large crystal showing good faces is measuring 20 x 25 mm in size. No damage and with a very good patina. A neat miniature from this classic locality! Ex Gene Tribby collection #1003 with label and data card dating the specimen to 1967. Ref: Rocks & Minerals:58:109 & 64:150.
© Dan Weinrich	Photo ID: 135814 View Count: 72
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