Mineral Identification Tests
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Why is it the least reliable
Some minerals like halite are clear
What is the color test
The easiest test to preform but it is the least reliable
What is luster
The way a mineral reflects light
Name the 2 categories of luster
metallic and non- metallic
Name 3 example of metallic luster
Galena Pyrite Magnetite
What is the hardness test
A minerals resistance to scratching
What do we usually use as a base line with hardness
Glass
What is glass hardness
5.5
Name the only mineral with a hardness of 10
Diamond
What is streak
The collar of the mineral
What is cleavage
The ability to be “cut” along flat surfaces
What are the 3 types of cleavage
Basal cleavage Cubic cleavage Rhombohedral cleavage
What is basal cleavage
Splits in to flat sheets
What is cubic cleavage
The mineral splits in three direction Each 90 degree of each other Like a cube
What is rhombohedral cleavage
The mineral slits like a cube with sides not at 90 degrees
Fracture
Minerals without cleavage may break in typical patterns useful for identification. Unpredictable predictable braking pattern
Name the HALITE look alike that reacts with hydrochloride acid
Calcite