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Moonstone cabochon. The most common moonstone is of the orthoclase feldspar mineral adularia, named for an early mining site near Mt. Adular in Switzerland, now the town of St. Gotthard. [1] [better source needed] A solid solution of the plagioclase feldspar oligoclase +/− the potassium feldspar orthoclase also produces moonstone specimens.
Belomorite is a spectacular and popular jewelry and ornamental material, one of the varieties of moonstone. However, due to its fragility and perfect cleavage, the mineral often breaks and is difficult to process, so it is cut in the form of simple cabochons (oval, round, teardrop-shaped), as well as balls or polished plates.
The middle part of this crystal sparkles, and usually the color is darkest in the middle and becomes lighter toward the outer edges. The feldspar which usually displays the aventurine appearance is oligoclase , though the effect is sometimes seen in orthoclase : hence two kinds of sunstone are distinguished as "oligoclase sunstone" and ...
The optical effect of adularescence in moonstone is typically due to adularia. [7] The largest documented single crystal of orthoclase was found in the Ural Mountains in Russia. It measured around 10 m × 10 m × 0.4 m (33 ft × 33 ft × 1 ft) and weighed around 100 tonnes (110 short tons). [8]
Selenite, satin spar, desert rose, and gypsum flower are crystal habit varieties of the mineral gypsum.. All varieties of gypsum, including selenite and alabaster, are composed of calcium sulfate dihydrate (meaning that it has two molecules of water), with the chemical formula CaSO 4 ·2H 2 O. Selenite contains no selenium, the similar names both derive from Greek selḗnē (σελήνη 'Moon').
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