hexagonal crystal form of quartz

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hexagonal crystal form of quartz
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Cubic crystals of fluorite
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Hexagonal calcite (crystal form)
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Crystal form of feldspar
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Crystal form(the geometric form of a well
developed crystal)
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Four directions of cleavage (fluorite)
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Crystal form and one-directional cleavage
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mineral streak( the color of a powdered mineral
)
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One-directional cleavage( producing a flat
cleavage plane with a high luster.)
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Two directions of cleavage.
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Three directional cleavage of calcite
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Four directional cleavage of fluorite
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Six directions of cleavage of sphalerite
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Mineral hardness(A minerals resistance toward
scratching)
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Hardness of gypsum is 2 and a fingernail has a
hardess of 2 1/2
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quartz (hardness of 7) scratches glass (hardness
of 5 to 6)
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non-metallic lusters
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metallic luster
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Metallic lusters
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Variable colors of fluorite
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Colors of quartz(Color is variable for most
non-metallic minerals.)
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