Problem Set # 7



 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. 

_______     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)


 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


 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 with a diagram how a cation other than Si in a mineral can take a place in the atomic structure of a
     mineral (happens mostly in the phylosilicate or tectosilicate subclass).  In other words, why can there be more

     Than quartz in the tectosilicate mineral class.

                                               CLICK HERE FOR ANSWERS