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The Mineral Identification Key |  |
Minerals with cleavage
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| Microcline feldspar, South Dakota, 4cm long. Perfect cleavage is the right face. Good cleavage is the top face |
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| Perfect cleavage - cleavage is planar (the lines on the
surface are another feldspar which has weathered somewhat). |
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| Good cleavage is easily seen, but it is not totally
planar (there are some bumps in cleavage surface) |
