Mineral Specimen and Product Inventory Search
- Availability
- Sold
- Featured
- Featured in Special Editions
- Locality
- Kearsarge mine, Houghton Co., Michigan, United States
- Formula
- Cu
- Size
- 11 x 6 x 6 cm - Cabinet
- Tagged
- Ore Minerals
Large Copper mass from amygdaloidal basalts. This specimen also contains a bit of Silver. Well over 6 million tons of native Copper has been mined from these deposits which stretch the entire length of upper Michigan from Wisconsin to Keweenaw point. The Copper occurs within open-space fillings and replacements in amygdaloidal flow tops of the Portage Lake Lava Series. These Copper deposits has been mined since prehistoric times.
- Availability
- Sold
- Featured
- Featured in Special Editions
- Locality
- White Pine mine, Ontonagon Co., Michigan, United States
- Formula
- Cu
- Size
- 8.5 x 4.5 x 2 cm - Sm Cabinet
- Tagged
- Ore Minerals
The copper deposits of the White Pine mine are large stratiform deposits in the Nonesuch shale of upper Precambrian age. The ore is typically finely disseminated barely seen in the shale. Copper concentrations average 1-2% Copper. Higher grade zones occur in open fractures from a second pulse of mineralization and the Copper can crystallize nicely as with this specimen which shows superb micro octahedral crystals with a peculiar brassy luster. Micro Bornite (?) crystals are sprinkled about the Copper. Great showy specimen.
- Availability
- Sold
- Featured
- Featured in Special Editions
- Locality
- Norwich, Ontonagon Co., Michigan, United States
- Formula
- Cu
- Size
- 11 x 5.5 x 7 cm - Cabinet
- Tagged
- Ore Minerals
Native Copper to 1.5cm in Epidote from presumably from the Portage Lake volcanics of the upper Michigan Lake Superior district.
- Availability
- Sold
- Locality
- Central mine, Central, Keweenaw Co., Michigan, United States
- Formula
- Cu
- Size
- 5.5 x 3 x 2 cm - Sm Cabinet
- Tagged
- native element
Superb Copper specimen showing several cubic crystals and a spinel law twin 2cm long along the twinning plane.
- Availability
- Available
- Price
- $100.00
- Reduced Price
- $50.00
- Locality
- Central mine, Central, Keweenaw Co., Michigan, United States
- Formula
- Cu
- Size
- 5 x 1 x 1 cm - Miniature
- Tagged
- native element
Excellent Copper specimen with spinel-law twinning.
- Availability
- Available
- Price
- $75.00
- Reduced Price
- $50.00
- Locality
- Central mine, Central, Keweenaw Co., Michigan, United States
- Formula
- Cu
- Size
- 4.5 x 2.3 x 2 cm - Miniature
- Tagged
- native element
Crudely formed Copper crystals in mass.
