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Mineral Lecture
1.
Properties
Uses Identification
2.
Definition 1.
Naturally Occurring 2. Inorganic solid 3. Chemical Composition (i.e. NaCl, Au) 4. Physical Properties 5. Crystalline Structure (3‐D arrangement)
3.
Property 1: Color The least reliable property of minerals Some minerals have more than one color, and many
minerals may have the same color Clarity: transparent, translucent, opaque
4.
Property 2: Crystal Form Crystal geometry: cube, pyramid, tetrahedron, etc. External
property Perfect form = RARE
5.
Property 3: Luster Describes light reflection from mineral surface Metallic (M): silver, gold, copper, steel
Nonmetallic (NM): not metallic Vitreous – glass Waxy – candle Pearly Satiny Earthy – dull, no reflection Greasy – oily Porcelaneous – translucent white
6.
Property 4: Hardness Mineralogist Friedrich Mohs
(1773‐1839) Resistance to scratching Hard: scratch glass (>5.5) Soft: cannot scratch glass (<5.5) Streak plate = 6.5
7.
Property 5: Streak Streak: color of a mineral after it
is ground to a fine powder Use a streak plate CAUTION: streak plate has hardness = 6.5 (white powder) If >6.5, crush with hammer
8.
Property 6, 7: Cleavage/Fracture Cleavage: minerals break (cleave) along surfaces
Weak chemical bonds Cleavage direction: parallel surface of break Fracture: break not along cleavage planes Not flat, not parallel sets
9.
Other Important Properties Reaction to HCl (calcite, powdered dolomite)
Magnetism: magnetite