Earth Science. The ability of a mineral to glow DURING and after exposure to ultraviolet light.

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Presentation transcript:

Earth Science

The ability of a mineral to glow DURING and after exposure to ultraviolet light

The bending of light rays as they pass through a mineral

The ability of a mineral to continue to glow AFTER exposure to ultraviolet light

Atoms are bonded tightly together

The mineral will split into even sheets

4

Quartz Feldspar Mica Calcite Iron

halite

Gold and copper

90%

Silicate minerals Nonsilicate minerals

Carbonates Oxides Sulfides Sulfates Halides Native elements

Silicon Oxygen

Feldspar is an example Composed to interconnected tetrahedrons that form an intricate framework

Chemical composition

Pitchblende

feldspar

magnetite

Density

Silicon Oxygen

Sodium Calcium

brilliant

lodestone

Garnet

The mineral with the higher number can scratch the lower number

Quartz is a framework silicate It contains only silicon-oxygen tetrahedra The bonds between the tetrahedra are very strong This makes quartz extremely hard

Feldspar is a framework silicate Some tetrahedra in feldspar have atoms of metal instead of silicon The bonds between these atoms are weaker than those between silicon and oxygen Therefore, feldspar is not as hard as quartz