Feldspar (hardness: 6-6.5 Mohs)
Two distinctly different alkali alumino silicates: the Plagioclase and
the Alkali Feldspar Series
Specific gravity: 2.55-2.76
Plagioclase Series—
_Labradorite_: Colorful, iridescent, also transparent stones in
yellow, orange, red, and green
_Sunstone_: Gold spangles from inclusions of hematite
_Peristerite_: Blue white iridescence
Alkali Feldspar Group—
_Orthoclase_: Pale yellow, flesh red
_Amazonite_: Yellow green to greenish blue
_Moonstone_: Colorless; also white to yellowish, and reddish to bluish
gray
Garnet (hardness: 6.5-7.5 Mohs)
A group of silicate minerals
Specific gravity: 3.5-4.3
_Almandine_: Orangy red to purplish red
_Almandine-spessartine_: Reddish orange
_Andradite_: Yellowish green to orangy yellow to black
_Demantoid_: Green to yellow green andradite
_Topazolite_: Yellow to orangy yellow
_Grossular_: Colorless; also orange, pink, yellow, and brown
_Tsavorite_: Green to yellowish green
_Hessonite_: Yellow orange to red
_Pyrope_: Colorless; also pink to red
_Chrome pyrope_: Orange red
_Pyrope-Almadine_: Reddish orange to red purple
_Pyrope-Spessartine_: Greenish yellow to purple
_Malaia_: Yellowish to reddish orange to brown
_Color-change garnet_: Blue green in daylight to purple red in
incandescent light
_Rhodolite_: Purplish red to red purple
_Spessartine_: Yellowish orange
_Uvarovite_: Emerald green