Sum11.208.minerals

Sum11.208.minerals - Definition of a Mineral Minerals The...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Definition of a Mineral Minerals The Geologic Alphabet • • • • • Natural Solid Inorganic Crystalline Structure Chemical Compound Source: E. R. Degginger/Bruce Coleman Inc. Mineral Formation Form Igneous Rocks Primary 1. Crystallize out of a magma 2. Crystallize out of water Form Sedimentary Rocks Secondary 3. Chemical Weathering 4. Metamorphism Form Metamorphic Rocks Physical Properties of Minerals A. Mineral Shape Fracture Crystal Form Quartz: Conchoidal Source: Jeffrey Scovil Mineral Cleavage Mineral Cleavage Halite - 3 planes; angle 90° Muscovite - 1 plane; angle N/A Muscovite 1 1 2 3 Source: Ed Degginger/Bruce Coleman Inc. Source: Breck P. Kent Mineral Cleavage luorite Fluorite: 4Fplanes; not 90° Fluorite Physical Properties of Minerals 1 B. Mineral Appearance 3 2 4 Color Quartz Color Quartz Powder Streak (Powder Color) Luster Hematite Metallic Highly reflected and “metal colored” Nonmetallic Vitreous Varies Pearly Resinous Earthy (Dull) Shines like glass Whitish iridescence (like a pearl) Dull shine (like wax) Surface doesn’t reflect light Source: Breck P. Kent Metallic Luster Nonmetallic Luster - Vitreous Quartz Source: E. R. Degginger/Earth Scenes Nonmetallic Luster - Earthy Optical Properties 1. Opaque 2. Translucent 3. Transparent Source: Breck P. Kent Petrologic Microscope Olivine Calcite Biotite in white light Polarized Light Quartz Mohs Hardness Scale Physical Properties of Minerals C. Mineral Strength/Density Specific Gravity (Density) Reaction to HCl (Calcite) Magnetism (Magnetite) Physical Properties of Minerals D. Other Properties Taste (Halite) Smell (Sulfur) Feel (Talc) Striations & Banding Fluorescence - White light Source: Breck P. Kent Fluorescence - UV light Source: Breck P. Kent Piezoelectricity Silicates: SiliconOxygen Tetrahedron Silicate Minerals (90% of the Earth’s Crust) Contain Silica - Silicon and Oxygen Silicates can be: Important Silicates Micas Mafic Minerals Muscovite Feldspars Low Silica (Mg, Fe) Orthoclase Dark Colored Dark colored (including black & green) Heavy weight Heavy weight Color vs. Light colored Light Colored (including white, tan, orange) Olivine Light weight Light weight Felsic Minerals High Silica (Al, K) Quartz Density Density ...
View Full Document

This note was uploaded on 01/11/2012 for the course GEO 208 taught by Professor Robviens during the Summer '11 term at Bellevue College.

Ask a homework question - tutors are online