**Which of the following physical properties of a mineral depends on the strength of the bonds that hold its atoms and ions together?
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c. specific gravity
**When the chemical bonds in a mineral are equal in all directions, what will the result be?
a. a nonmetallic luster
c. conchoidal fracture
d. a low density
**What must be true in order for an ore mineral occurrence to be economically valuable?
a. Natural processes must have concentrated the desired element to greater degree than its average crustal abundance.
b. There must be enough of the ore mineral to make extraction profitable.
c. The sale price of the element must be greater than the costs of mining and extraction.
d. All of the possible answers are correct.
**Polymorphs (minerals like diamond and graphite that have the same chemical composition but are nevertheless different minerals) exist because
a. the elements of which they are made contain atoms of different atomic mass.
b. their mineral structures differ based on the different temperature and pressure conditions under which they formed.
c. impurities are present in the crystal structures.
d. their mineral structures differ due to the effects of the organic processes by which they formed.
**What properties are required for a mineral to be used as (a) an abrasive, (b) jewelry, and (c) a source of iron?