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feldspar
felspar
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These granite dikes are composed almost totally of potassium feldspar and quartz.
Minerals such as feldspar , which are insoluble in water, will not give a positive test.
Quartz is associated most commonly with aegirine and potassium feldspar as well as zircon.
Its most abundant mineral is feldspar , which accounts for two-thirds of the Earth's crust.
Larger crystals of feldspar and quartz dominate the host rock.
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