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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, inexpensive and popular ornamental stone; it is used in jewelry as one of the varieties of “moonstone”. It is typically cut into cabochons , often double-sided, convex in both directions, thus enhancing its brilliance, unlike, say, similar labradorite , which is often cut into flat plates cut parallel to the ...
Moonstone; Opal; Peridot; Peristerite (Albite variety) ... This page was last edited on 30 December 2024, ... Color (beta) Automatic. Light.
Opalite is a trade name for synthetic opalescent glass and various opal and moonstone simulants. Other names for this glass product include argenon, sea opal, opal moonstone, and other similar names. [1] [2] It is also used to promote impure varieties of variously colored common opal. [1]
In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [ 80 ] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...
In gemology, their luster is called adularescence and is typically described as creamy or silvery white with a "billowy" quality. It is the state gem of Florida . The gemstone commonly called rainbow moonstone is more properly a colorless form of labradorite and can be distinguished from "true" moonstone by its greater transparency and play of ...
Adularescence in a moonstone cabochon, Minas Gerais, Brazil. The specimen's diameter is 23 mm (0.91 in). Adularescence (/ ˌ æ dʒ ə l ə ˈ r ɛ s ən s / AJ-ə-lə-RES-əns) is an optical phenomenon that is produced in gemstones like moonstone. The optical effect is similar to labradorescence and aventurescence.
The quality of the polish is also a factor. The "dragon skin" cracking usually hinders its value [citation needed]; the most prized ammolite is the sheet type [citation needed] (see formation) that has broad, uninterrupted swathes of color similar to the "broad flash" category of opal. The matrix is not visible in finer grades, and there should ...
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