1) Beautiful stone 2) Cut mineral 3) Decorative stone 4) Gemstone 5) Gemstone mineral 6) Jewel 7) Jewel mineral 8) Mineral gemstone 9) Mineral jewel 10) Orthorhombic mineral 11) Polished mineral 12) Polished jewel 13) Prized stone 14) Precious jewel 15) Prized mineral 16) Precious gemstone 17) Precious stone
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https://www.crosswordclues.com/clue/andalusite
Andalusite is an aluminium nesosilicate mineral with the chemical formula Al2SiO5. Andalusite is trimorphic with kyanite and sillimanite, being the lower pressure mid temperature polymorph. At higher temperatures and pressures, andalusite may convert to sillimanite. Thus, as with its other polymorphs, andalusite ia an aluminosilicate index mineral...
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http://en.wikipedia.org/wiki/Andalusite
• (n.) A silicate of aluminium, occurring usually in thick rhombic prisms, nearly square, of a grayish or pale reddish tint. It was first discovered in Andalusia, Spain.
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http://thinkexist.com/dictionary/meaning/andalusite/
(Al2SiO5), aluminum silicate mineral that occurs in relatively small amounts in various metamorphic rocks, particularly in altered sediments. It is ... [1 related articles]
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http://www.britannica.com/eb/a-z/a/70
A polymorph whose other two minerals are kyanite and sillimanite. A particularly notable variety of andalusite is chiastolite, which has crosses of carbon in it.
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http://www.encyclo.co.uk/local/20206
An`da·lu'site noun (Min.) A silicate of aluminium, occurring usually in thick rhombic prisms, nearly square, of a grayish or pale reddish tint. It was first discovered in Andalusia, Spain.
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http://www.encyclo.co.uk/webster/A/80
Andalusite is a mineral formed by the metamorphism of aluminous shales and slate. It is used in the manufacture of spark plugs and other porcelains and may serve as a gem stone if it is clear and transparent, and exhibits the optical phenomenon of pleochroism - that is the capacity to appear in different colours when viewed in different lights and ...
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http://www.probertencyclopaedia.com/browse/HA.HTM
an orthorhombic form of aluminum silicate, AlSiO, found in schistose rocks.
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https://www.infoplease.com/dictionary/andalusite
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