Riebeckite
Fun Fact: Named after the German explorer and rock collector, Emil Riebeck.
Introduction: Named after the German explorer and rock collector, Emil Riebeck. A German chemist named them 'blau-eisenstein' or blue ironstone before being renamed crocidolite shortly afterwards. This mineral becomes brown and brittle after weathering and the silicification of its weathered fibres forms 'tiger's eye', a quartz variety.
Distribution: Found on farm Groot Aub 267 in the Rehoboth District.
Composition: Silicate.
Crystal system: Monoclinic.
Lustre: Vitreous, silky.
Streak: Blue-grey.
Hardness: 5.
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