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Riebeckite

Type Locality
Socotra Island, Adan Governorate, Yemen
Mineral Data
◻[Na2][Fe2+3Fe3+2]Si8O22(
Strunz: 
9.DE.25
Physical Properties
Hardness: 
5.0 - 5.5
Tenacity: 
brittle
Synonyms
Synonyms: 
Riebeckite -
Photos