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Tweddillite

About
Group Parent: 
Type Locality
Wessels Mine, North Cape Province, South Africa
Mineral Data
{CaSr}{Mn3+AlMn3+}(Si2O7)(SiO4)O(OH)
Strunz: 
8/C.23-45
Physical Properties
Colour: 
Deep red
Crystal System: 
Monoclinic
Streak: 
Brownish red
Hardness: 
6 - 7
Synonyms
Synonyms: 
Manganipiemontite-(Sr), Twedillite and IMA2001-014