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Piemontite

Type Locality
Prabornaz Mine (Praborna Mine), Saint-Marcel, Aosta Valley, Italy
Mineral Data
{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
Strunz: 
9.BG.05
Physical Properties
Streak: 
Reddish
Hardness: 
6.0 - 6.5
Tenacity: 
brittle
Synonyms
Synonyms: 
Piedmontite
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