Olivine

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Mineral class:	Nesosilicate
Composition:	(Mg, Fe)2SiO4
Hardness:	6.5 - 7
Luster:	Dull, Glassy, Resinous, Vitreous
Color:	Yellowish or greyish green
Streak:	White
Crystal form:	Orthorhombic; small grains and granular masses
Uses:	Jewelry
Comments:	An essential mineral component of gabbro, peridotite, and basalt. Crystals often form on basalt.