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Crystal Structure Flashcards | StudBud
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Crystal Structure
Crystal Structure
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Questions
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Answers
1
Octahedral coordination bears the coordination number CN =
6
4
6 OR 8
8
2
Crystals can have cation sites with distinct coordination numbers
False
True
3
According tp Pauling's rules, octahedral sites cannot share faces
False
True
4
Which of these is NOT a possible formula for a mienral in the olivine group ((Mg,Fe)
2
SiO
4
)
Mg3FeSiO4
MgFeSiO4
Fe2SiO4
Mg2,SiO4
5
Which is accurate about
VI
Fe
3+
ions
they are octahedrally coordinated
their ionic radii are smaller than VIFe2+ ions
they are hexagonally coordinated
their ionic radii are smaller than IVFe3+ ions
6
Which would you predict would occupy the largest (highest CN) site in a mineral
Si4+
Ca2+
Al3+
Na+
7
Pauling's rule that relates to
parsimony
tells us (choose any that apply)
mineral formulas tend to have low, rational numbers of atoms
geometric configurations of crystals in nature are limited
simple 3D geometry in a crystal tends to minimize energy (and is favored)
highly charged ions tend to have short, strong bonds with anions
8
Substitution of Mg
2+
and Fe
2+
is responsible for complete solid solution
False
True
9
Which contributes significantly to mineral density (choose all that apply)
the atoms involved (# protons+neutrons)
hydrogen bonds (= higher density in minerals where they dominate)
sulfur (= sulfates & sulfides are among the highest density minerals)
bond lengths (close apcking = higher density)
10
An octahedron has 8 faces and 6 corners, whereas a cube has 6 faces and 8 corners
False
True
