Dumortierite
Fun Fact: Dumortierite is normally an enormous, blue-violet-purple rock.
Introduction: A lump of dumortierite is normally an enormous, blue-violet-purple rock, usually cut for ornamental purposes. It is named after a French palaeontologist, Eugene Dumortier.
Distribution: North of the Erongo Mountains on farm Etemba 135 west of Omaruru. Also found from the farm Carolina 99 in the Keetmanshoop region.
Composition: Silicate
Crystal system: Orthorhombic
Lustre: Dull, vitreous
Streak: White
Hardness: 8.5
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