Fine Mineral Specimens Over $50
- 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
- Locality
- Reynolds Tunnel, Summitville dist., Rio Grande Co., Colorado, United States
- Formula
- CuS
- Size
- 5 x 4 x 2.5 cm - Miniature
- Tagged
- sulfide, copper
Deep purple and blue, excellent crystal plates of Covellite to 5mm.
- Availability
- Sold
- Featured
- Featured in Special Editions
- Locality
- Butte dist., Silver Bow Co., Montana, United States
- Formula
- CuS
- Size
- 8 x 4.5 x 8 cm - Sm Cabinet
- Tagged
- Ore Minerals
A thick seam of foliated platy Covellite with the typical blue-purple iridescence containing about 66% Copper making it one of the chief economic ores of Copper.
Discovered in 1877, the Butte district was one of the most important mining districts in the USA. Butte has produced millions of tons of Copper and considerable amounts of Silver Gold, Lead and Zinc as well as some incredibly and highly collectible mineral specimens. During its hey day, Butte was considered the "richest hill on earth". The mineral deposits of Butte fueled the ever increasing demands of our industrial machine and in the process helped build the country to what it is today. Unfortunately, the consequence of these societal demands of the past are the environmental issues inherited today.
- Availability
- Available
- Price
- $125.00
- Locality
- Liberty (Hall) mine, Nye Co., Nevada, United States
- Formula
- Ca3Al2(SO4)(OH)2F8ยท2H2O
- Size
- 4.5 x 4.5 x 2.5 cm - Miniature
Lilac colored sharp Creedite crystals to 3mm, but mostly 1-2mm. Excellent specimen.
- Availability
- Available
- Price
- $50.00
- Locality
- Presidente Kubitschek, Minas Gerais, Brazil
- Formula
- Sr(Mn,Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH)38
- Size
- 2 x 2 x 1.5 cm - Thumbnail
Black formless crystal grain to 1.5mm, on Quartz crystal. Lurking about is also golden Rutile crystals. Crichtonite is a fairly rare titanium mineral with several other (possible) elements as shown above in the formula.
