Piemontite
Piemontiet, Piemontit, Piemontita, Пьемонтит
Commonly known
rarer (so called collectors stones)
very rare (rarities)
relatively rare organic material
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Formula:
Ca2(Al,Mn3+,Fe3+)3(SiO4)(Si2O7)O(OH)
Mineral class: silicates Crystal system: monoclinic Mohs scale: 6 - 6.5 Density (g/cm3): 3.46 - 3.54 Refractive index: 1.730 - 1.829 Cleavage: different Colors: yellowish, pink, reddish, brownish, violet Transparency: translucent - opaque Luster: vitreous Fluorescence: - Pleochroism: yellow, red, violet Largest crystal: 8 cm? Deposits: worldwide Discovery: 1853 1st Description: 1853 (G. A. Kenngott) Name: after the type locality Piedmont / Italy |
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Piemontite Mineral
Size: 4 x 3 x 2.5 cm Origin: Tachgagalt Mine / Quarzazate Prov. / Souss-Massa-Draâ Reg. / Morocco Photo by kind permission of © António Manuel Ináçio Martins |
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Piemontite
Size: 1.9 x 1.5 cm Weight: 12.09 ct Origin: Taos County / New Mexico / USA Photo by kind permission of © www.thegemtrader.com |
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Piemontite Mineral
Fild of View: 0.5 cm Origin: Picuris Distr. / Taos County / New Mexico / USA Photo by kind permission of © Michael C. Roarke |
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