Mineral Gallery
Rhodochrosite
Written by Boss Tambang Tuesday, 01 December 2009 23:35
Another name for rhodochrosite is raspberry spar. This is a cousin of calcite, but where calcite has calcium, rhodochrosite has manganese. The manganese gives it a rosy pink color even in clear crystals. This polished specimen, shown about three times life size, displays the mineral in a botryoidal mass—that’s from the Latin for a bunch of grapes. The crystals are mostly microscopic.
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Staurolite
Written by Boss Tambang Tuesday, 01 December 2009 23:33
Staurolite is a brown silicate mineral that forms under medium-grade conditions of metamorphism, as in this mica schist from New Hampshire. Well-formed crystals are commonly twinned, crossing at 90- or 60-degree angles. I found this pair of...
Talc
Written by Boss Tambang Tuesday, 01 December 2009 23:32
Talc is the softest mineral, the standard for hardness grade 1 in the Mohs scale. Your fingernail will scratch it. It has a greasy feel and a translucent, soapy look. It’s very useful, and not just because it can be ground into talcum powder—it’s a...
Ulexite
Written by Boss Tambang Tuesday, 01 December 2009 23:28
Ulexite is a desert mineral that combines calcium, sodium, water molecules, and boron in a complicated arrangement. It forms in alkali salt flats where the local water is rich in boron. Its hardness is about 2 on the Mohs scale. In rock shops, cut slabs of it like this one are commonly...
Variscite
Written by Boss Tambang Tuesday, 01 December 2009 23:26
Variscite is a hydrous aluminum phosphate, Al(H2O)2(PO4), with a Mohs hardness of around 4. It has what’s called a porcelaneous luster, which is somewhere between waxy and vitreous. It forms as a secondary...
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