
1) Beautiful stone 2) Cut mineral 3) Decorative stone 4) Gemstone mineral 5) Gemstone 6) Jewel 7) Jewel mineral 8) Mineral jewel 9) Mineral gemstone 10) Polished jewel 11) Polished mineral 12) Precious gem 13) Precious stone 14) Precious jewel 15) Precious gemstone 16) Prized mineral 17) Prized stone
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https://www.crosswordclues.com/clue/adularia

• (n.) A transparent or translucent variety of common feldspar, or orthoclase, which often shows pearly opalescent reflections; -- called by lapidaries moonstone.
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http://thinkexist.com/dictionary/meaning/adularia/

a feldspar mineral and potassium aluminosilicate (KAlSi3O8). It commonly forms colourless, glassy, prismatic, twinned crystals in low-temperature ...
Found on
http://www.britannica.com/eb/a-z/a/21
Ad`u·la'ri·a noun [ From
Adula , a mountain peak in Switzerland, where fine specimens are found.]
(Min.) A transparent or translucent variety of common feldspar, or orthoclase, which often shows pearly opalescent reflections; -- called by lapidaries
moonstone .
Found on
http://www.encyclo.co.uk/webster/A/33

Adularia (Moonstone) is a semi-precious, clear, transparent, glassy form of potash feldspar which is found mainly in the crevices of crystalline schists and gneisses, often in beautifully perfect crystals. It has sometimes a pearly, opalescent reflection or play of colours. It derives its name from Adula, a mountain peak in Switzerland, where fine ...
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http://www.probertencyclopaedia.com/browse/HA.HTM

(KALSi3O8) A colourless translucent variety of potash feldspar.
Found on
https://www.encyclo.co.uk/local/20501

a sometimes opalescent variety of orthoclase formed at a low temperature.
Found on
https://www.infoplease.com/dictionary/adularia
No exact match found.