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Mineral Specimens

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22 specimens listed
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Silver and Copper (halfbreed)
stock #14.1-269
Caledonia Mine, Mass City, Ontonagon County
Michigan, United States
2.2 x 1.7 x 1.2 CM (thumbnail)
price: $110


A US classic a choice Halfbreed of Silver and Copper that shows perfectly the two metallic colors with very bright luster. Looks fine on all sides, the Halfbreed masses from this region are unlike anything from other places. The copper mined in the Upper Pennisula of Michigan tended to have some small percentage of Silver mixed in. This was especially desirable in the early manufacturing of electrical wires.
Pyrolusite with Manganite -well crystallized
stock #20.1-281
Negaunee, Marquette Co.
Michigan, United States
10.5 x 6.8 x 5.1 CM (cabinet)
price: $680


Pyrolusite is not usually thought of as an esthetic mineral unless it is very well crystalized. This piece has sprays and individual crystals to almost 5 CM long and has some free standing, cleanly terminated prisms. Excellent bright silver metallic luster, this is a very attractive version of a "black ugly" specie. An older classic US locale, this is a substantial piece not often seen in this esthetic quality.
Copper -superb spinel twins
stock #14.1-407
Central Mine, Keweenaw Co.
Michigan, United States
7.4 x 4.1 x 3.4 CM (cabinet)
price: $1200


Simply fantastic, a very well crystallized Copper with sculptural form much like a tree or cactus. The most prominent twin crystal at the top is 3.1 CM tall and the whole is very esthetic. From the Central mine of Michigan, this classic site produced many excellent spinel twins in its working life. This is well above the quality of "typical" pieces which are now uncommon. A fine USA classic copper that would be desirable from anyplace, a super example of the fames Upper Peninsula copper country. The piece displays great from almost any angle.
Silver and Copper
stock #LH-702
Calumet
Michigan, United States
6.7 x 3.1 x 1.7 CM (cabinet)
price: $120
Spring 2020

A hackly mass of Copper holds some areas of crudely crystalline Silver. The largest zone of Silver also has a few areas of Copper growing on the Ag which is less common than the other way round. A good mixed native element specimen from the Hitchings collection that he obtained in 1970. This sort of association is unique to the upper Pennisula of Michigan.
Silver on Copper
stock #17.1-624
Keweenaw Co.
Michigan, United States
4.6 x 2.7 x 1.6 CM (miniature)
price: $350
Spring 2020

A classic USA "halfbreed" cluster of crude crystals with a sizable percentage of Silver. Ex Less Hitchings collection, the main "glob" of Silver is 2.3 CM across and has distinct color, form and relief from the Copper. The specimen was purchased in 1967 and as was typical at that time has only the area locality (Keweenaw Penninsula). Good halfbreeds have always been appreciated as classic for the UP, and are unique in the world. This one is particularly rich and esthetic, weighs 57 grams, quite dense for the miniature size.
Silver - very pure crystalline mass
stock #10.1-137
Mass Consolidated Mine, Mass City, Ontonagon County,
Michigan, United States
5.3 x 4.7 z 3.2 CM (small cabinet/ large miniature)
price: $1300


A complex mass of crude crystals that have very clearly formed in a conglomerate type matrix that is now gone. This is a sponge-like cluster yet very solid and intricate. The patina ranges from a dark near black on some edges grading to a more silvery metallic in the center. I have not seen many specimens from the Mass mine but all have this spongy look and this is the best example in my limited experience. According to Mindat the mine closed in 1919. A really different looking Silver that displays fine on all sides. 78 grams.
Copper in and on Calcite USA Classic
stock #AX-12-460
Keweenaw Co.
Michigan, United States
5.3 x 3.4 x 2.7 CM (cabinet)
price: $1150
Spring 2020

An excellent vintage Copper in Calcite from the famed Philadelphia Academy collection, and retains their original label. This also has labels from Collectors Edge and Carter Rich, and was for a time in the William Hladysz collection. The matrix here is mostly clear Calcite in clusters of crystals more or less aligned. The clear Calcite are colored red-brown by large amounts of included copper easily seen inside the crystals. In several areas the Copper crystals extend outside the Calcite. The main crystal is 1.2 CM and very well formed. In excellent condition, and much better looking in person.
Polianite (Pyrolusite pseudo after Manganite)
stock #AX-10-869
Alberta, Baraga County
Michigan, United States
8 x 5.5 x 3.1 CM (cabinet)
price: $160
Spring 2020

A choice Michigan specimen with sharp black-silvery crystals that are a perfect replacement of Manganite. Most likely from the Taylor mine but there is no documentation of that detail. From the Palmer collection that was assembled in conjunction with the late Dr. Joe Mandarino for use in his research and publications. The crystals are quite sharp and lustrous reaching to 1 CM some are also free standing.
22 specimens listed
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