1) Beautiful stone 2) Cut mineral 3) Decorative stone 4) Gemstone 5) Gemstone mineral 6) Jewel 7) Jewel mineral 8) Magnesium mineral 9) Mineral jewel 10) Mineral gemstone 11) Polished mineral 12) Polished jewel 13) Precious gemstone 14) Prized mineral 15) Precious gem 16) Prized stone 17) Precious jewel
Found on
https://www.crosswordclues.com/clue/riebeckite
Riebeckite is a sodium-rich member of the amphibole group of silicate minerals, chemical formula ☐Na2(Fe2+3Fe3+2)Si8O22(OH)2. It forms a series with magnesioriebeckite. It crystallizes in the monoclinic system, usually as long prismatic crystals showing a diamond-shaped cross section, but also in fibrous, bladed, acicular, columnar, and radiatin...
Found on
http://en.wikipedia.org/wiki/Riebeckite
a sodium-iron silicate mineral [Na2Fe2+3Fe3+2Si8O22(OH)2] in the amphibole family. It forms part of a solid-solution series that includes both ... [2 related articles]
Found on
http://www.britannica.com/eb/a-z/r/48
Riebeckite is an accessory mineral of the amphibole group found in granite and syenite and other igneous rocks. Riebeckite is a hydrous silicate of sodium, ferrous iron, magnesium and ferric iron named after the German Emil Riebeck who first discovered it.
Found on
http://www.probertencyclopaedia.com/browse/HR.HTM
No exact match found.
