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Questions and Answers
Which type of symmetry do minerals in the olivine group crystallize with?
Which type of symmetry do minerals in the olivine group crystallize with?
- Orthorhombic symmetry (correct)
- Cubic symmetry
- Monoclinic symmetry
- Tetragonal symmetry
What type of coordination do the divalent atoms have in the structures of olivine group minerals?
What type of coordination do the divalent atoms have in the structures of olivine group minerals?
- Four-fold coordination
- Six-fold coordination (correct)
- Five-fold coordination
- Eight-fold coordination
In the idealized olivine silicate structure, with what do the Si atoms share oxygen?
In the idealized olivine silicate structure, with what do the Si atoms share oxygen?
- Adjacent tetrahedra
- Adjacent divalent cations
- Adjacent trivalent ions
- Adjacent octahedra (correct)
Where are half of the divalent cations located in the olivine silicate structure?
Where are half of the divalent cations located in the olivine silicate structure?
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Which ions are either absent or present in very small amounts in the structures of olivine group minerals?
Which ions are either absent or present in very small amounts in the structures of olivine group minerals?
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Study Notes
Olivine Group Minerals
- Minerals in the olivine group crystallize with orthorhombic symmetry.
- Divalent atoms in olivine group minerals have octahedral coordination in their structures.
- In the idealized olivine silicate structure, Si atoms share oxygen with divalent cations.
- Half of the divalent cations are located in octahedral sites in the olivine silicate structure.
- Alkali ions (e.g. Na+, K+) are either absent or present in very small amounts in the structures of olivine group minerals.
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