1) Beautiful stone 2) Calcium mineral 3) Cut mineral 4) Decorative stone 5) Gemstone 6) Gemstone mineral 7) Jewel 8) Jewel mineral 9) Manganese mineral 10) Mineral gemstone 11) Mineral jewel 12) Polished jewel 13) Polished mineral 14) Prized mineral 15) Prized stone 16) Precious jewel 17) Precious gemstone
Found on
https://www.crosswordclues.com/clue/piemontite
Piemontite is a sorosilicate mineral in the monoclinic crystal system with the chemical formula Ca2(Al,Mn3+,Fe3+)3(SiO4)(Si2O7)O(OH). It is a member of the epidote group. Red to reddish-brown or red-black in colour, Piemontite has a red streak and a vitreous lustre. The type locality is the Prabornaz Mine, in Saint-Marcel, Aosta Valley, Italy. It ...
Found on
http://en.wikipedia.org/wiki/Piemontite
a silicate mineral that belongs to the epidote (q.v.) series.
Found on
http://www.britannica.com/eb/a-z/p/65
Piemontite (piedmontite) is a rare reddish-brown coloured mineral first discovered in New Zealand and confirmed as a distinct species in 1853. It is a hydrous silicate of calcium, aluminium and ferric iron and usually contains between five and twenty percent manganese oxide. Piemontite is found in metasomatic manganese ore deposits in andesite, rhy...
Found on
http://www.probertencyclopaedia.com/browse/HP.HTM
No exact match found.
