Chapter 2: Properties of Minerals (2.3). Minerals: the building blocks of rocks. Definition of a Mineral: naturally occurring inorganic solid characteristic crystalline structure definite chemical composition. How do we identify minerals?. Physical properties: Color Streak
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Streak – color of a mineral in powdered form
(used for metallic minerals)
Obtained by scratching a mineral on a piece of unglazed porcelain.
Softest (1) – Talc
- Fingernail (2.5)
- Copper penny (3.5)
- Wire nail (4.5)
- Glass (5.5)
- Streak plate (6.5)
Mohs Scale of Hardness