What Rocks are Made of - What Rocks are Made of Rocks are...

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What Rocks are Made of  11/02/2008 12:57:00 Rocks are made up of minerals How do minerals form? Three ways… o Cooling From Melted rock (volcano) o Chemical Precipitation from a solution (the crystallized minerals left in  a tea kettle after water has boiled away….or with salt stains on streets  during the winter.) o Formation from solid state (diamond…graphite heated and squeezed  to an extreme amount and then turns into a diamond). Some Key Minerals 4000 minerals 3 Key groups of minerals o Silicates (most abundant on earth….silicon and oxygen plus other  elements) Made of two key atoms, silicon and oxygen. In a tetrahedron  shape…. SiO + other elements Make up 90% of the rocks in the continental crust “Light” versus “Dark” silicates in color and density (light is less  dense, and usually brighter) Ex. Quartz is a Light silicate (SiO 2  ) Ex. Feldspar is a light silicate Ex. Pyroxene Dark silicate (Dark green)
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