mineral / chemical formula

properties / significance


magnetite (lodestone)Fe2O3 black ferrimagnetic mineral in the spinel group, converts to hematite on oxidation, produced from peridotites and dunites by serpentinization. most igneous rocks and metamorphic rocks, many sedimentary rocks, widespread ore deposits, banded iron formations

quartz (silica) SiO2

[gallery, 2, 3]

silica tetrahedra, tectosilicate, hexagonal rhombohedral crystals in numerous varieties named for color and microstructure, numerous growth forms commonest mineral, igneous, sedimentary, and metamorphic rocks, hydrothermal veins and pegmatites, granite, sandstone, limestone


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. . . since 10/06/06