It occurs as clear, white to gray, blocky to lath shaped grains in common mafic igneous rocks such as basalt and gabbro, as well as in anorthosites.
2.
"' Xanthoxenite "'is a rare calcium iron ( III ) phosphate mineral with formula : Ca 4 Fe 3 + 2 ( PO 4 ) 4 ( OH ) 2 ?H 2 O . It occurs as earthy pale to brownish yellow incrustations and lath shaped crystals.
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