Classification of Minerals Possibilities?. Chemical composition Gold, Silver, Sulfur Native elements Au, Ag, S Sulfides Pyrite, Galena FeS, PbS Hematite,

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Presentation transcript:

Classification of Minerals Possibilities?

Chemical composition Gold, Silver, Sulfur Native elements Au, Ag, S Sulfides Pyrite, Galena FeS, PbS Hematite, Magnetite Fe 2 O 3, Fe 3 O 4 Oxides Silicates Quartz, Mica, Feldspar SiO 2 KAl 2 (AlSi 3 O 10 )(OH,F,Cl) 2 KAlSi 3 O 8

Silic- is for Silicon (s) Silicates -ate is a suffix for “oxide “ Silicates are “oxides of silicon”

Quartz Mica KAl 2 (AlSi 3 O 10 )(OH,F,Cl) 2 SiO 2 Can you find the “silica” ? Silicates

Silica Structure 4 oxygen atoms for every 1 silicon atom

Olivine Feldspar, Quartz Micas Amphibole (Hornblende) Pyroxenes (Augite) ComplexityTemp.

Chemical formula: C GraphiteDiamond How can 2 minerals with the same composition be so different?

What’s the point here? “Internal Arrangement of Atoms” controls most physical properties!

Review of Concepts: 1. Minerals can be identified by examining….. Physical Properties, including…. Luster, Hardness, Cleavage, Color, Streak, Density…. 2. Minerals are classified according to their….. Chemical Composition, including groups like…. Native Elements, Sulfides, Oxides, and the all important SILICATES 3. The “Basic Building Block” of the Silicate Minerals is…..

Review of Concepts: (continued) 4. The physical properties of minerals are generally controlled by….. Crystalline Structure…. …or the “orderly internal arrangement of the atoms”! What do graphite and diamond have in common?…… Identical Chemical Composition…. What accounts for the differences between graphite and diamond? ….the “orderly internal arrangement of the atoms!

Quartz Muscovite Mica