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ATHENA

MINERALOGY

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Mineral: MANGANIPIEMONTITE-(Sr) = TWEDDILLITE
Formula: CaSr(Mn3+,Fe3+)2Al(SiO4)(Si2O7)O(OH)
Crystal System: Monoclinic
Group: Epidote group
References: MM 66 (2002), 137; MR 3 (2003), 270; EJM 18 (2006), 551; L 1 (2016), 62
Type Locality: Wessels mine, Kalahari Mn field, Kuruman Hill, Cape Province, South Africa

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