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minerals
minerals
20
Science
7th Grade
01/08/2014

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Term
what is a mineral?
Definition
a naturally occuring, inorganic solid with a definate chemical compositions and an orderly arrangement of atoms
Term
How many elements occur naturally in the earth's crust?
Definition
90 elements
Term
What is the most common mineral?
Definition
silica
Term
What eliments does silica contain?
Definition
oxygen and silicon
Term
apperance
Definition
color/texture
Term
cleavage
Definition
minerals that brake smooth
Term
fracture
Definition
minerals that brake uneven/rough/jagged
Term
hardness
Definition
how hard is it
Term
the scale for hardness is called:
Definition
moh's scale (10-1)
Term
diamonds hardness
Definition
10
Term
talc's hardness
Definition
1
Term
luster
Definition
minerals that reflect light
Term
streak
Definition
powdered color of a mineral
Term
specific gravity
Definition
wieght compared to same volume in water
Term
what 2 charictaristics make up a gem
Definition
it has to be beutiful and rare
Term
what is ore
Definition
a mineral/rock that contains a useful element
Term
hemitite
Definition
iron ore
Term
bauxite
Definition
alluminum ore
Term
magnetite
Definition
iron ore
Term
What is smelting?
Definition
seperating minerals and dirt
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