Properties of minerals 0.0 / 5 ? GeologyASWJEC Created by: Bill CooperCreated on: 29-04-13 12:00 Streak: A mineral in powdered form Opacity: Degree of transparancy 1 of 5 Lustre: How it reflects light Hardness: Moh's scale (Fingernail 2.5, Copper coin 3.5, Steel pin 5.5) 2 of 5 Density: Light, Medium (Quartz : 2.65), Heavy Habit/form: The most commonly found shape/form of the mineral 3 of 5 Cleavage: The tendancy of a mineral to break along planes of weakness Fracture: The characteristic way in which the mineral breaks 4 of 5 Other properties: eg Magnetism, reaction with HCl, Twinning, fluorescence Twinning: Contact Twin, Interpenetrant Twin, Repeated Twin 5 of 5
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