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| On the hardness scale, what number indicates that a mineral is hard? |
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Definition
| > 5.5. Anything greater than 5.5 will scratch glass. |
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| The geometric shapes that a crystal takes on. i.e. cubes, pyramids, prisms, etc. this crystal form or combination of crystal forms is also know as "Habit". |
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Definition
| 1 flat cleavage plane. Muscovite. |
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Definition
| 1 flat cleavage plane. Muscovite. |
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Definition
| Has two cleavage planes. Can either intersect at 90 degrees like Plagioclase or not at 90 degrees like Hornblende. |
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Definition
| 3 cleavage planes. Intersects at 90 degree angles. Halite, galena |
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Definition
| Has three cleavage planes, but does not intersect at 90 degree angles. Calcite or dolomite. ; |
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Definition
| 4 main cleavage planes. Looks like two square pyramids stacked bottom to bottom. Fluorite. |
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