
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) Prized mineral 13) Precious stone 14) Precious gem 15) Precious gemstone 16) Prized stone 17) Precious jewel
Found on
https://www.crosswordclues.com/clue/bytownite

Bytownite is a calcium rich member of the plagioclase solid solution series of feldspar minerals. It is usually defined as having `%An` between 70 and 90. Like others of the series, bytownite forms grey to white triclinic crystals commonly exhibiting the typical plagioclase twinning and associated fine striations. The specific gravity of bytowni.....
Found on
http://en.wikipedia.org/wiki/Bytownite

(from the article `plagioclase`) ...N.Y., United States. Andesine, less common, occurs in many granular and volcanic rocks with intermediate silica content, as in Marmato, Colom., ... ...somewhat less common. Anorthite is found only in gabbros, though it is common in certain high-grade metamorphic rocks such as granulite facies. ... ...
Found on
http://www.britannica.com/eb/a-z/b/137

a blue to dark-gray mineral near the anorthite end of the plagioclase feldspar group.
Found on
https://www.infoplease.com/dictionary/bytownite
No exact match found.