Orthoclase
Fun Fact: This mineral has two prominent right-angled cleavages.
Introduction: Orthoclase is a combination of two Greek words: orthos for 'right' and klas meaning 'to break'. This refers to the mineral's two prominent right-angled cleavages. It is found in igneous rocks, syenites and some sandstones such as arkose, which has a high feldspar content.
Distribution: Common in many of Namibia's gneisses and granites.
Composition: Silicate
Crystal system: Monoclinic
Lustre: Pearly, vitreous
Streak: White
Hardness: 6-6.5
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