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Problem Set # 7 |
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Silicates |
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1.
Using the general silicate formula, XmYn(ZpOq)wr,
match each appropriate element or element grouping |
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and subscript in each mineral formula below with
that of each letter or number in the general formula. |
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a. Be3Al2Si6O18 |
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b. CaAl2Si2O7(OH)2 |
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2.
Match the subclass of silicate with the mineral formula. |
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1. CaSiO3 |
a.
nesosilicate |
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2. KMg3AlSi3O10(OH)2 |
b.
sorosilicate |
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3. (Mg,Fe)3(Al,Si)4O10(OH)2 |
c.
cyclosilicate |
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4. Zn4Si2O7(OH)2.H2O |
d.
inosilicate (single chain) |
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5. CaAl2Si7O18.6H2O |
e.
inosilicate (double chain) |
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6. (Mg,Fe)7Si8O22(OH)2 |
f.
phyllosilicate |
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7. Mg3Al2Si3O12 |
g.
tectosilicates |
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8. LiAlSi2O6 (Al = CN with O of 6) |
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3.
Match the columns below |
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1. K-feldspar group |
a.
nesosilicate |
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2. mica group |
b.
sorosilicate |
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3. amphibole group |
c.
cyclosilicate |
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4. pyroxene group |
d.
inosilicate (single chain) |
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5. garnet group |
e.
inosilicate (double chain) |
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6. plagioclase feldspar |
f.
phyllosilicate |
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g.
tectosilicate |
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4.
Match the columns below |
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1. K-feldspar group |
a.
isomorphic group |
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2. enstatite-ferrosilite |
b.
polymorphic group |
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3. pyroxene group |
c.
solid solution series |
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4. amphibole group |
d.
other or chemical group |
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5.
Fill in the mineral name or word which best matches the statement below |
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__________________a.
the group of tectosilicate subclass displaying a
water softening property |
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__________________b.
the mineral group whose minerals often display a dodecahedron form of crystal |
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__________________c.
the plagioclase mineral often displaying iridescence |
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__________________d.
the silicate subclass with mineral formulas displaying a p:q of 2:7 |
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__________________e.
the inosilicate group of minerals displaying a lack
of (OH)x in the formula |
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__________________f.
the name of the deep green gemstone variety of beryl |
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__________________g.
the name of the most common amphibole mineral |
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__________________h.
the red-pink variety of tourmaline |
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6. Explain with a diagram how a cation other than Si in a mineral can take a place in the
atomic structure of a Than quartz in the tectosilicate
mineral class. |
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