Student Resources—746

Minerals
Minerals
Reference Handbooks
Mineral Color Streak Hardness Breakage Uses and Other
(formula) Pattern Properties
Calcite colorless, colorless, 3 cleavage in fizzes when HCI is added;
(CaCO3) white, white three used in cements and other
pale
blue
directions building materials
Dolomite colorless, white 3.5–4 cleavage in concrete and cement;
(CaMg (CO3) 2) white, three used as an ornamental
pink,
green,
gray,
black
directions building stone
Fluorite colorless, colorless 4 cleavage in used in the manufacture
(CaF2) white, four of optical equipment;
blue, directions glows under
green,
red, yellow,
purple
ultraviolet light
Hornblende green to gray to 5– 6 cleavage in will transmit light on
(CaNa) 2-3 black white two thin edges; 6-sided
(Mg,Al,
Fe) 5-(Al,Si) 2
Si6O22 (OH) 2)
directions cross section
Feldspar colorless, colorless 6 two cleavage used in the manufacture
(KAlSi3O8) white to planes meet of ceramics
(NaAl gray, at 90° angle
Si3O8), (CaAl2Si2 O8) green
Augite black colorless 6 cleavage in square or 8-sided
((Ca,Na) two cross section
(Mg,Fe,Al)
(Al,Si) 2 O6) directions
Olivine olive, none 6.5–7 conchoidal gemstones,
((Mg,Fe) 2
SiO4) green fracture refractory sand
Quartz colorless, none 7 conchoidal used in glass manufacture,
(SiO2) various fracture electronic equipment,
colors radios, computers,
watches, gemstones
REFERENCE HANDBOOKS 793
Reference Handbooks