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FRACTURE
irregular or broken surface that is not along the cleavage
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FLEXIBLE
can be bent, but cannot be bent back to its original shape
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ELASTIC
can be bent and can return to its original shape
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METALLIC
mineral that shines like polished metal
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TRANSPARENT
almost (mostly) all light passes through
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LUSTER
the way a mineral reflects light
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STREAK
color of minerals powder when rubbed onto black or white porcelain tile (streak plate)
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FLUORESCENCE
the ability that some minerals have to glow under ultra-violet light
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SILICATE
mineral that contains a combination of silicon, oxygen, and one or more metals
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CRYSTAL
a solid whose ions, atoms, or molecules are arranged in a definite pattern
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BRITTLE
can be broken into small, irregular pieces
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COCHOIDAL
curved glass-like surface
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OPAQUE
no light can pass through
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VITREOUS
shines like a piece of glass
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SILKY
shines like a piece of silk
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MINERAL
a naturally formed, inorganic solid that has a definite crystalline structure
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NON-SILICATE
a mineral that does not contain compounds of silicon or oxygen
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TRANSLUCENT
some light passes through
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DIAPHANEITY
how a mineral allows light to pass through
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TENACITY
resistance to breakage
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