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Geo Physical Prop.

Tenacity The resistance of a mineral to breakage. (Elastic, Flexible, Malleable, Brittle, Sectile)
Reaction with acid Some minerals effervesce when in contact with acidic solutions. Calcite will readily effervesce in acid and dolomite will effervesce when powdered.
Odor Some minerals have a distinctive odor when scratched such as sphalerite and sulfur (rotten eggs).
Hardness The resistance of a mineral to scratching or abrasion.
Mohs Scale of Hardness 1. Talc 2. Gypsum 3. Calcite 4. Fluorite 5. Apatite 6. Orthoclase 7. Quartz 8. Topaz 9. Corundum 10. Diamond
Cleavage The tendency of a mineral to break along specific planes of weakness. Minerals may have one, two, three, four, or more directions of cleavage. Cleavage is reported by stating the number of planes and the angle between them.
Crystal Form The external shape a mineral exhibits when it forms in a fluid or cavity.
Diaphaneity The ability to transmit light. Transparent, Translucent, Opaque
Streak The color of a mineral when powdered. Streak is most diagnostic for metallic minerals, and for those minerals with a hardness less than 7.
Fracture The description of the way a mineral tends to break. Conchoidal, Uneven, Fibrous
Luster The appearance of a mineral in reflected light. Metallic, Adamantine, Waazy, Greasy, Pearly, Resinous, Dull/Earthy
Taste Some minerals have a distinctive taste such as halite (salty) and some clay minerals (earthy).
Created by: FaithRaquel2015