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Rocks & Mineral Identification Chapter 2 Identification Strategies Streak – Color of a mineral in its powdered form – Rub a rock or mineral on a ceramic streak plate – Metallic minerals Dark streak – The color of the streak may not necessarily be the color of the mineral Color – Elements dictate the color of a mineral Rock/Mineral ID Luster – Used to describe how light is reflected from the rock or mineral – Metallic looks like metal [Copper] – Glassy Clear or shiny [Obsidian] – Silky looks like strands of silk Rock/Mineral ID Hardness – Resistance to being scratched – Moh’s Hardness Scale Includes minerals of a known hardness Other items can be used to determine hardness Rock/Mineral ID Cleavage – Tendency of a mineral to cleave, or break along flat surfaces – Natural breakage of a rock or mineral – Micas have perfect cleavage = can peel off in sheets Fracture – Uneven breakage of rock Conchoidal – smooth, curved surfaces Glassy – looks like glass