Classification of Minerals

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Classification of Minerals
Possibilities?
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Chemical composition
Gold, Silver, Sulfur
Au, Ag, S
Native elements
Pyrite, Galena
FeS, PbS
Sulfides
Hematite, Magnetite
Fe2O3, Fe3O4
Oxides
SiO2 KAl2(AlSi3O10)(OH,F,Cl)2 KAlSi3O8
Quartz, Mica, Feldspar
Silicates
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Silic- is for Silicon (s)
Silicates
-ate is a suffix for oxide
Silicates are oxides of silicon
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Quartz
Silicates
Mica
KAl2(AlSi3O10)(OH,F,Cl)2
SiO2
Can you find the silica ?
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Silica Structure
4 oxygen atoms for every 1 silicon atom
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Olivine
Complexity
Temp.
Pyroxenes (Augite)
Amphibole (Hornblende)
Micas
Feldspar, Quartz
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Chemical formula C
Graphite
Diamond
Chemical formulaC
How can 2 minerals with the same composition be
so different?
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Whats the point here?
Internal Arrangement of Atoms controls most
physical properties!
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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..
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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!
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Quartz
Muscovite Mica