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. Mineral Groups. . All others: 1.5%. Element Abundances. . Silica(SiO4)4-. SILICATES. . Common cations thatbond with silica anions. Oxides O2-Carbonates(CO3)2-Sulfides S2-Sulfates(SO4)2-HalidesCl-, F-, Br-Native elements(single elements; e.g., Au). Mineral Groups. Silicates (most abundant)Non-silicates (~8% of Earth
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3. Mineral Groups Silicates (most abundant)
Non-silicates (~8% of Earth’s crust):
4. Mineral Groups – Silicates Silicates
Tetrahedron
fundamental building block
4 oxygen ions surrounding a much smaller silicon ion
5. Mineral Groups – Silicates Joining Silicate Structures
How tetrahedra may be linked:
independent tetrahedra
single chains
double chains
sheets
3-D framework
6. Mineral Groups– Silicates –
7. Mineral Groups – Silicates
12. Mineral Groups – Silicates
13. Mineral Groups – Silicates
14. Mineral Groups – Silicates
15. SEM photograph of clay minerals: authigenic chlorite flake from the Watahomigi Formation in Andrus Canyon, Supai Group, Grand Canyon; x 20,900. Figure 05-D, U.S.
16. Mineral Groups – Silicates
17. Mineral Groups – Silicates
18. Mineral Groups
20. Nonsilicate Minerals Usually form at low temperatures
Carbonates
Calcite - Ca CO3
Dolomite - CaMg(CO3)2
Evaporite Minerals
Gypsum - CaSO4-2H2O
Halite - NaCl
Oxides
Hematite