spessartine
spessartine (spessartite) Member of the garnet group of minerals, that has the formula Mn3 Al2 (SiO4)3; sp. gr. 4.18; hardness 6.5–7.5; cubic; dark red to orange-yellow or brown; greasy to vitreous lustre; crystals commonly dodecahedra; widely distributed in metamorphic and igneous rocks, and in beach and river sands. It is named after the Spessart Mountains, Bavaria, W. Germany.
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Almandine , almandine Member of the garnet group of minerals, Fe3Al2(SiO4)3; sp. gr. 4.25; hardness 6.5–7.5; cubic; red, brown-red, or black; greasy to vitreous… Pyroxene , pyroxene An important group of inosilicates (chain silicates) comprising the orthorhombic pyroxenes (orthopyroxenes) and the monoclinic pyroxenes (cl… Biotite , biotite
biotite An important rock-forming silicate mineral; a member of the mica group K2(Mg,Fe)6[Si3AlO10]2(OH,F)4, in which the Mg/Fe ratio is less… Zircon , zircon Mineral, ZrSiO4; sp. gr. 4.6; hardness 7.5; tetragonal; most commonly light brown or reddish-brown, but sometimes grey, yellow, or green; vitr… Hard Rock Cafe International Inc , Hard Rock Cafe International, Inc.
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spessartine