Staurolite
Introduction: Cruciform twinned crystals often occur in staurolite, hence the Greek stauros meaning 'cross'. It is a metamorphic mineral usually found in schist and common in heavy-mineral sand deposits.
Distribution: Excavated near the Old Gorab Mine from the early 20th century.
Composition: Silicate
Crystal system: Monoclinic
Lustre: Resinous,vitreous
Streak: White to pale grey
Hardness: 7-7.5
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