grade 7 science unit 4 the earth s crust l.
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Grade 7 Science Unit 4: The Earth’s Crust. Rocks and Minerals. Mineral. A pure, naturally occurring inorganic solid. There are hundreds of different minerals on our planet – many look alike. Properties of minerals. Color “ What color is the mineral?

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mineral
Mineral
  • A pure, naturally occurring inorganic solid.
  • There are hundreds of different minerals on our planet – many look alike.
properties of minerals
Properties of minerals
  • Color

“ What color is the mineral?

* Alone, color is NOT a reliable way to identify a mineral.

slide5

Lustre

“How shiny is the mineral? OR How is the light reflected from the mineral’s surface?”

terms describing lustre
Terms describing Lustre…

Dull: does not reflect light

Chalk

slide9

Streak

The powdered form of the mineral.

“What color is left behind when you scratch a porcelain tile?”

slide11

Hardness

“How difficult is it to scratch a mineral?”

The harder mineral will scratch the softer one.

*Use Mohs Hardness Scale

slide13

Cleavage

The tendency to split along smooth, flat surfaces called planes.

slide14

Fracture

Breaking with rough or jagged edges.

slide15

Core Lab

Activity 10-1C

Pages 322(3)

“A Mineralogist’s Mystery”