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Feldspar Crystals in Basalt Chunk Free shipping over $100 or personal growthFeldspar Crystals in Basalt Chunk Weight 115g 6x5x1cm approx. Feldspar is the most abundant mineral group in the Earths crust. There are more feldspars (60%) than all the other minerals combined in the outer (13 17) km of the crust1. Feldspars occur in most igneous and metamorphic rocks. They are less common in sedimentary rocks as they tend to break down to clay minerals in the weathering environment. Feldspars are broadly divided into two groups:
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