| 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 | |
| and subscript in each mineral formula below with that of each letter or number in the general formula. | |
| a. Be3Al2Si6O18 | |
| b. CaAl2Si2O7(OH)2 | |
| 2. Match the subclass
of silicate with the mineral formula. |
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| _______ 1. CaSiO3 | a. nesosilicate |
| _______ 2. KMg3AlSi3O10(OH)2 | b. sorosilicate |
| _______ 3. (Mg,Fe)3(Al,Si)4O10(OH)2 | c. cyclosilicate |
| _______ 4. Zn4Si2O7(OH)2.H2O | d. inosilicate (single chain) |
| _______ 5. CaAl2Si7O18.6H2O | e. inosilicate (double chain) |
| _______ 6. (Mg,Fe)7Si8O22(OH)2 | f. phyllosilicate |
| _______ 7. Mg3Al2Si3O12 | g. tectosilicates |
| _______ 8. LiAlSi2O6 (Al = CN with O of 6) | |
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| 3. Match the columns below | |
| _______ 1. K-feldspar group | a. nesosilicate |
| _______ 2. mica group | b. sorosilicate |
| _______ 3. amphibole group | c. cyclosilicate |
| _______ 4. pyroxene group | d. inosilicate (single chain) |
| _______ 5. garnet group | e. inosilicate (double chain) |
| _______ 6. plagioclase feldspar | f. phyllosilicate |
| g. tectosilicate | |
| 4. Match the columns below | |
| _______ 1. K-feldspar group | a. isomorphic group |
| _______ 2. enstatite-ferrosilite | b. polymorphic group |
| _______ 3. pyroxene group | c. solid solution series |
| _______ 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 | |
| __________________a. the group of tectosilicate subclass displaying a water softening property | |
| __________________b. the mineral group whose minerals often display a dodecahedron form of crystal | |
| __________________c. the plagioclase mineral often displaying iridescence | |
| __________________d. the silicate subclass with mineral formulas displaying a p:q of 2:7 | |
| __________________e. the inosilicate group of minerals displaying a lack of (OH)x in the formula | |
| __________________f. the name of the deep green gemstone variety of beryl | |
| __________________g. the name of the most common amphibole mineral | |
| __________________h. the red-pink variety of tourmaline | |
| 6. Explain why or show how an O in a silicate subclass other than the neso-silicates can form a bond with | |
| other element polyhedra if 2 tetrahedra of Z elements (referring to the general formula) are coordinated | |
| with that O. An example is how can a K polyhedron with an 8 CN with O attach with a common O | |
| shared by 2 Z tetrahedra to form the mineral, orthoclase?. | |
CLICK HERE FOR ANSWERS |
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