Ui umpluuie and quartz
d. galena and sulfur
3. which physical property of halite is best being demonstrated by the photograph?
a. hardness
b. cleavage
c. streak d. luster
4. quartz and halite have different crystal shapes primarily because
a. light reflects from crystal surfaces
b. energy is released during crystallization
c. of impurities that produce surface variations
d. of the internal arrangement of the atoms
and the chart chowing the annrovimate hardness of some common