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) Polished mineral 11) Polished jewel 12) Precious gem 13) Precious gemstone 14) Prized stone 15) Precious jewel 16) Precious stone 17) Prized mineral
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https://www.crosswordclues.com/clue/arfvedsonite
Arfvedsonite is a sodium amphibole mineral with composition: [Na][Na2][(Fe2+)4Fe3+][(OH)2|Si8O22]. It crystallizes in the monoclinic prismatic crystal system and typically occurs as greenish black to bluish grey fibrous to radiating or stellate prisms. It is a rather rare mineral occurring in nepheline syenite intrusions and agpaitic (peralkaline)...
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http://en.wikipedia.org/wiki/Arfvedsonite
amphibole mineral, an iron-rich sodium silicate. Lithium and magnesium replace iron in the structure to form eckermannite. Both minerals ... [1 related articles]
Found on
http://www.britannica.com/eb/a-z/a/97
Arfvedsonite is a black or greenish black mineral of the amphibole group.
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http://www.probertencyclopaedia.com/browse/HA.HTM
a sodium-rich amphibole, occurring in green to black crystals in alkalic rocks.
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https://www.infoplease.com/dictionary/arfvedsonite
No exact match found.
