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MINERAL NAME, FORMULA | |
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GREEN, brown, yellow color; vitreous luster; GENERALLY GRANULAR; heavy; H=6. | OLIVINE,
(Mg,Fe)2SiO4 |
| Most commonly COLORLESS, LIGHT GRAY, or WHITE, but can be any color including purple, pink, yellow, etc. CONCHOIDAL FRACTURE; vitreous luster; H=7; may have crystal faces. | QUARTZ,
SiO2 |
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| RED, PINK, most common, but can be brown, black, even green; vitreous luster; H=7-7.5; often equant crystals; may exhibit "parting" which can be confused with cleavage. | GARNET,
(Mg,Fe,Ca)3Al2Si3O12 |
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