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Questions and Answers
What is the defining structural characteristic of nesosilicates?
What is the defining structural characteristic of nesosilicates?
- Isolated silica tetrahedra (correct)
- Three-dimensional framework of silica tetrahedra
- Sheet-like arrangement of silica tetrahedra
- Double chains of silica tetrahedra
Which nesosilicate is known for its high resistance to weathering and is often used in dating geological events?
Which nesosilicate is known for its high resistance to weathering and is often used in dating geological events?
- Olivine
- Andalusite
- Zircon (correct)
- Topaz
Garnet, a common nesosilicate, is known for its typical shape. What shape do garnet crystals most commonly take?
Garnet, a common nesosilicate, is known for its typical shape. What shape do garnet crystals most commonly take?
- Dodecahedron (correct)
- Octahedron
- Cube
- Hexagonal prism
In which type of crystal system does the nesosilicate mineral kyanite commonly form?
In which type of crystal system does the nesosilicate mineral kyanite commonly form?
Which mineral is a nesosilicate that changes form under different pressure and temperature conditions and is thus a polymorph?
Which mineral is a nesosilicate that changes form under different pressure and temperature conditions and is thus a polymorph?
Flashcards
Defining structural characteristic of Nesosilicates
Defining structural characteristic of Nesosilicates
Isolated silica tetrahedra, not bonded to other tetrahedra in a continuous network.
Example of nesosilicate mineral
Example of nesosilicate mineral
Olivine is an example of a nesosilicate mineral.
Typical Garnet Crystal shape
Typical Garnet Crystal shape
A dodecahedron.
Nesosilicate known for high weathering resistance
Nesosilicate known for high weathering resistance
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Meaning of 'orthosilicate'
Meaning of 'orthosilicate'
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Study Notes
Nesosilicates
- Defining structural characteristic: Isolated silica tetrahedra
- Examples of nesosilicates: Feldspar, Quartz, Olivine, Muscovite
- Garnet crystal shape: Dodecahedron
- Typical green nesosilicate in igneous rocks: Olivine
- Kyanite crystal system: Monoclinic
- Weathering-resistant nesosilicate used in dating: Olivine
Forsterite Chemical Formula
- Chemical formula of forsterite (a type of olivine): Mg2SiO4
Polymorph Mineral
- Mineral that changes form under different pressure and temperature conditions: Kyanite
Orthosilicate Definition
- Orthosilicate refers to isolated SiO4 tetrahedra
Metamorphic Rock Nesosilicate
- Nesosilicate found in metamorphic rocks with diagnostic cross-shaped twinning: Staurolite
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