Andalusite
Introduction: Named after Andalusia in Spain, where this mineral was first discovered. Crystals often elongate, pencil-like and are often red-brown to tan. It is used in the manufacture of high-alumina refractory products and in ceramics production and is an non-corrosive agent. Aluminium is extracted from andalusite and its lightness is used in the aircraft industry.
Distribution: Common in some schists in rocky outcrops to the south-west of Okahandja and in the Kuiseb River valley near the old Gorob Mine.
Composition: Silicae.
Crystal system: Orthorhombic.
Lustre: Vitreous.
Streak: White.
Hardness: 6.5-7.5.
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