
1) Beautiful stone 2) Cut mineral 3) Decorative stone 4) Gemstone mineral 5) Gemstone 6) Hexagonal mineral 7) Industrial mineral 8) Jewel mineral 9) Jewel 10) Mineral gemstone 11) Mineral 12) Mineral jewel 13) Nephelite 14) Potassium mineral 15) Polished mineral 16) Polished jewel 17) Precious gem 18) Precious stone
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https://www.crosswordclues.com/clue/nepheline

1) Nephelite
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https://www.crosswordclues.com/clue/nepheline

Nepheline, also called nephelite (from Greek: νεφέλη, `cloud`), is a feldspathoid: a silica-undersaturated aluminosilicate, Na3KAl4Si4O16, that occurs in intrusive and volcanic rocks with low silica, and in their associated pegmatites. Nepheline crystals are rare and belong to the hexagonal system, usually having the form of a short, six-s.....
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http://en.wikipedia.org/wiki/Nepheline

• (n.) Alt. of Nephelite • (n.) Alt. of Nephelite
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http://thinkexist.com/dictionary/meaning/nepheline/

the most common feldspathoid mineral, an aluminosilicate of sodium and potassium [(Na,K)AlSiO4]. It is sometimes used as a substitute for feldspars ... [4 related articles]
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http://www.britannica.com/eb/a-z/n/25

Nepheline is a mineral that has the formulae (Na,K)AlSiO4 and a relative hardness of 6. It is formed mainly in pegmatite associated with nepheline syenite, but may also occur in gneiss and schist. Nepheline is associated with feldspars, calcite, cancrinite, hornblende and sodalite.
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[
n] - a whitish mineral consisting of sodium aluminum silicate or potassium aluminum silicate in crystalline form
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http://www.webdictionary.co.uk/definition.php?query=nepheline

nepheline A double silicate of aluminium and sodium, occurring chiefly in volcanic deposits in Italy. So named because its fragments are rendered cloudy by immersion in nitric.
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nephelite noun a whitish mineral consisting of sodium aluminum silicate or potassium aluminum silicate in crystalline form; used in the manufacture of ceramics and enamels
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https://www.encyclo.co.uk/local/20974

a feldspathoid mineral, essentially sodium aluminum silicate, NaAlSiO, occurring in alkali-rich volcanic rocks.
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https://www.infoplease.com/dictionary/nepheline
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