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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.
The stone found in an old mine was called “belomorite” — because, as Fersman explains, “The White Sea shimmered with the colors of moonstone... or did the stone reflect the pale blue depths of the White Sea?..” — Geologists took several samples to the Peterhof lapidary factory , recommending it as a new jewelry stone. [3]
Moonstone, one of June's modern birthstones, can appear to be almost clear at times, but is "prized for its blue to white adularescence," according to the International Gem Society.
Orthoclase, or orthoclase feldspar (endmember formula K Al Si 3 O 8), is an important tectosilicate mineral which forms igneous rock.The name is from the Ancient Greek for "straight fracture", because its two cleavage planes are at right angles to each other.
Cobá took its place in Maya culture no earlier than 100 B.C., and enjoyed a continuous life as a city until about 1,200 A.D. Known as the “city of chopped water,” the site may have had up to ...
Builders soon found that the stones were useful for more than just jewelry. The sand and stones became components of streets, sidewalks and foundations. It is believed that 10,000 loads [ vague ] of the stones were crushed and used in the foundation of the Southern California Edison plant built in Redondo Beach in 1907. [ 3 ]
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Sandakada Pahana, also known as Moonstone, is a unique feature of the architecture of ancient Sri Lanka. [ 1 ] [ 2 ] [ 3 ] It is an elaborately carved semi-circular stone slab, usually placed at the bottom of staircases and entrances.