South American Minerals
Page 4, Peru 2
Alabandite, Uchucchacua Mine, Oyon Province, Lima Department, Peru
CR 1252, Alabandite 20.7 g, 3.8 x 2.5 x 1.3. $35 Central crystal is approximately 7 mm across.
Rocks, Minerals, Collectibles, Geology
Alabandite from the Uchucchacua Mine is probably the worlds premier locality for this rare manganese sulfide. Reportedly there have been no additional finds since these first hit the market in 2010. Many of the specimens have rhodochrosite with them. Spinel law twins commonly occur
CR 1253, Alabandite 50.9 g, 4.7 x 3.1 x 1.9. $95 Central crystal is approximately 12 mm across. At least one good twin on this specimen. Minor damage to the main crystal.
CR 1254, Alabandite 50.9 g, 2.7 x 2.6 x 3.0. $145 Central crystal is approximately 10 mm across with a twinned crystal adjacent to it.
CR 1255, Alabandite 69.3 g, 3.4 x 2.5 x 4.2 $145 A nice mass of coarse crystals.
Fluorescent Manganoan Calcite, Rachracancha Mine, Oyon Province, Lima Department, Peru
These calcites have a strong orange fluorescence. They are a complex intergrowth of calcite crystals with various twins and other interesting forms. Very sculptural specimens, somewhat difficult to photograph due to the lack of contrast.
CR1079, Manganoan Calcite, 93.3 g, 5.3 x 4.8 x 4.6 cm, $45
CR1068, Manganoan Calcite, 373 g, 11.5 x 7.5 x 5.5 cm, $150. Cabinet sized piece with great 3 dimensional form.
Sphalerite +/- pyrite +/- manganoan calcite, Rachracancha Mine, Oyon Province, Lima Department, Peru. Some of these pieces have calcite rhombs with strong orange fluorescence. The pyrite on some specimens provides a nice contrast.
CR1777, Sphalerite with pyrite and manganoan calcite. 166 g, 5.3 x 4.7 x 3.8 cm, $75. Nice combo piece with a 9mm fluorescent calcite crystal in the center and a sprinkling of pyrite. Nice sharp crystals.
CR1778, Sphalerite 76.5 g, 6.3 x 5.0 x 2.2 cm, $30. Sharp sphalerite crystals up to 7 mm. A nice small cabinet piece.
CR1779, Sphalerite 108.8 g, 6.0 x 4.3 x 3.6 cm, $35. Sharp sphalerite crystals up to 7 mm. Interesting shape.
CR1782, Sphalerite with pyrite 104.6 g, 5.5 x 3.0 x 3.0 cm, $45. Sharp sphalerite crystals with bright pyrite that provides a nice contrast in this combo piece.
Pyrite, Huanzala Mine, Bolognesi Province, Ancash (formerly Huanuco) Department, Peru. Clusters of nice sharp octahedral crystals from one of Peru's famous mines. Tons of this material was mined in the 1980's, a must have for any pyrite collector.
CR1239, Pyrite 233.6 g, 6.5 x 5.5 x 3.4 cm, $45. Nice sharp octahedral crystals up to 13 mm. A drusy coating gives them extra sparkle. Excellent condition.
CR1240, Pyrite 202.8 g, 6.5 x 4.3 x 3.6 cm, $45. Nice sharp octahedral crystals mostly around 7 mm. Nice sculptural shape.
CR1242, Pyrite 215.8 g, 5.9 x 4.2 x 3.9 cm, $40. Nice sharp octahedral crystals up to 11 mm. Minor 'rubbing'.
CR1250c 155.2 g, 6.0 x 5.2 x 2.1 cm, $25. Mostly nice sharp octahedral crystals up to 13 mm. Minor damage.
CR1645, Coquimbite $8, g, I purchased a lot of coquimbite and have noticed that the pieces I put on display in my own cabinet is turning brown. On further checking with MinDat, I see that both light and humidity may affect the color. Therefore, if you want the specimen to retain its purple/violet color, it should be stored appropriately.