Igneous rocks are hard rock? why?
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Igneous rocks, like all rocks, consist of various kinds of minerals. Hardness in minerals is a function of the strength of their chemical bonds. ... Minerals like quartz and feldspar are moderately hard at hardness 6 and are the main minerals in felsic granites and rhyolites.
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: Igneous rocks, like all rocks, consist of various kinds of minerals. Hardness in minerals is a function of the strength of their chemical bonds. ... Minerals like quartz and feldspar are moderately hard at hardness 6 and are the main minerals in felsic granites and rhyolites.
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