Andradite
Introduction: Andradite was first described by the Brazilian geologist, Jose Bonifacio d'Andrada e Silva. It is often found as dark red dodecahedral crystals. It is most common in metamorphic marble and calc-silicate rocks.
Distribution: Brown to black andradite garnet is found in the Otjosondu manganese deposit north of Okahandja. It also occurs in marble 60km east of Swakopmund and in some pegmatites including Davib West 62, Tsawisis 16 and Davib Ost 61. Farms Tubussis 22 and Tumib 20, west of Erongo also contains andradite.
Composition: Silicate
Crystal system: Cubic
Lustre: Resinous, vitreous
Streak: White
Hardness: 3.7-4.1
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