Minerals and Mineral Identification By Mr. King. What is a mineral? Inorganic Inorganic Naturally occurring Naturally occurring Crystalline structure.

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Presentation transcript:

Minerals and Mineral Identification By Mr. King

What is a mineral? Inorganic Inorganic Naturally occurring Naturally occurring Crystalline structure Crystalline structure Chemical composition Chemical composition Distinct physical properties Distinct physical properties

Mineral properties Color Color Luster Luster Habit (Shape) Habit (Shape) Cleavage & Fracture Cleavage & Fracture Streak Streak Hardness Hardness Other Other

Color: Not mineral specific

Luster: How minerals reflect light Non- metallic Metallic

Mineral Habit (Shape) Shape a mineral takes if grown unimpeded

Cleavage Cleavage is the breakage along planes that cut across weak bonds, thus cleavage in controlled by the minerals atomic structure EG: rhombohedral calcite

Fracture Fractures occur in minerals whose bond strengths are the same in all directions thus breakage doesnt follow a crystallographic direction, but follows an irregular surface. EG: conchodial fracture in quartz

Cleavage

There is a visual difference between the cleavage and fracture in a mineral... Just wait

Streak: The powdered form of a mineral

Other Properties Specific gravity Specific gravity Reaction to acid Reaction to acid Striations Striations Magnetism Magnetism Fluorescence Fluorescence