291. Piemontite. Crystaline

Dana number

58.2.1a.11

Chemical formula

(Ca,Mn)(Ca,Sr,REE)(Mn3+,Fe3+)(Al,Mn)(Al)(SiO4)(Si2O7)(OH,F)(O)

Crystal class

Monoclinic

Mohs hardness

6

Specific gravity

3.38-3.61

Collected in

Peavine Mountain, Inashoe County, Reno, Nevada, United States

Back to top