Anhydrite
Introduction: The apparent absence of water in this mineral gave rise to its Greek name; 'an' meaning 'without' and hydro for 'water'.
Distribution: Minute crystals were found in the Tsumeb Mine.
Composition: Sulphate.
Crystal system: Orthorhombic.
Lustre: Pearly, greasy.
Streak: White, grey-white.
Hardness: 3.5.
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