page_title: Selenite (mineral)
section_title: Color
hierarchical_section_title: Selenite (mineral) / Crystal habit and properties / Color
caption_attribution_description: English: Azurite, Gypsum Locality: Buda Rock, Ray Mine, Pinal Co., Arizona Size: small cabinet, 7.6 x 7.2 x 5.9 cm Azurite on Selenite This beautiful and unusual specimen has a core of glassy and colorless gypsum crystals up to 1 cm in length. A druse of royal blue azurite, to .5 cm in length is on the smaller gypsum crystals and included within the larger ones, giving the whole specimen a wonderful color contrast. I have seen this material over the years, in trickles to the market. Never have I seen one of this size, quality, and overall showiness.It is, to me, a unique and interesting azurite occurrence in a combination that is for some reason simply almost never seen. Out of all the specimens of this material I have sene over the years, this one floored me for its overall quality and impact. Deutsch: Azurit, Gips Größe: 7.6 x 7.2 x 5.9 cm
context_page_description: Selenite, also known as satin spar, desert rose, or gypsum flower are four crystal structure varieties of the mineral gypsum. These four varieties of gypsum may be grouped together and called selenite.
  All varieties of gypsum, including selenite and alabaster, are composed of calcium sulfate dihydrate, with the chemical formula CaSO₄·2H₂O. Selenite contains no significant selenium, the similarity of the names of the substances coming from the Ancient Greek word for the Moon.
  Some of the largest crystals ever found are of selenite, the largest specimen found in the Naica Mine's Cave of the Crystals being 12 metres long and weighing 55 tons.
context_section_description: Gypsum crystals are colorless (most often selenite), white (or pearly –  most often satin spar), gray, brown, beige, orange, pink, yellow, light red, and green. Colors are caused by the presence of other mineral inclusions such as, copper ores, sulfur and sulfides, silver, iron ores, coal, calcite, dolomite, and opal.
caption: Azurite-gypsum "Buda Rock", Ray Mine Arizona.  A core of glassy and colorless gypsum crystals up to 1 cm in length with a druse of royal blue azurite, to 0.5 cm in length on the smaller gypsum crystals and included within the larger ones.
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