crystals1 jeff
malcom bridg middle school science student
the characteristics of a mineral?
1. must be made from nature.
2. must have a crystal pattern.
3. must be organic (non-living) solid.
4. must have certain chemical composition.

  what is a rock?
a mixture of minerals and elements.

how to identify a rock?
1. color, usually not helpful unless the color is different.                            example:yellow,red
2. luster: the way a mineral reflects to the light.

they are two kinds of lusters they are:
a. metallic luster:appears shiny like a metal.
b. nonmetallic luster:dull, and does not look like a metal.
may also look pearly, silky, glassy, or transparant.
3. streak: the color of a rock or mineral poder.
4. hardness: how easily or difficult it is to scratch a mineral a mineral's resistance to breaking.
5. a mineral that breaks along a smooth, flat surface.
6. fracture: a mineral that breaks rough and jagged.
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Last updated  2008/09/28 09:33:49 PDTHits  128