JEG100H1 Chapter Notes - Chapter 9: Conchoidal Fracture, Botryoidal, Weathering
11 Oct 2016
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What is a mineral: naturally occurring, solid, generally inorganic. Exception is buried calcium carbonate from shells and coral reefs. Ice is a mineral; water is not. Exception is mercury, which is liquid in nature. Some vary within well-defined limits: definite chemical composition allowing for some variation, orderly crystalline structure. Certain elements substitute for others without altering internal structure. What is a rock: rock: solid mass of mineral/mineral-like matter that occurs naturally, aggregate of several different minerals, some composed of non-mineral matter. Chemical reaction with water in the atmosphere. Luster: luster: appearance/quality of light reflected from surface of mineral, metallic, submetallic, nonmetallic. Tarnish develops on outside, shiny when broken. Vitreous, glassy, dull, earthy, peachy, silky, greasy. Color: some minerals come in various colors. Streak: color in powdered form, rub across streak plate. Unglazed porcelain: usually consistent color even if color of mineral varies, metallic has dark streak; nonmetallic has light streak, not all minerals produce streak.
