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PRECIOUS STONES
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Cape Ruby...........Deep-red African stone; found with
the diamond in South Africa.
Demantoid...........Or green garnet, a pale to deep and
slightly
yellowish green. The finer qualities are known commercially as olivine.
Hardness, 6 to 6.5; specific gravity, 3.83 to 3.85.
Essonite ............In
pale cinnamon color this is cinnamon stone. In orange it is called
jacinth; in a mixed red, orange, and brown, hyacinth. (The true jacinth
and hyacinth are zircons of those colors.) Hardness, 7-1/2 ; specific
gravity, 3.6 to 3.7.
Grossularite ........Or gooseberry stone, is a pale or
yellowish-green variety.
Montana Ruby......Is a fine, rich red variety found in
Montana and Arizona.
Pyrope..............Is the blood-red Bohemian garnet.
Hardness, 7-1/4; specific gravity, 37 to 3.8.
Rhodolite...........Is the pink garnet of North Carolina.
Spessartite .........Yellow.
Uwarowite..........Is an emerald-green variety found in
Russia.
It contains about twenty-two per cent, of oxide of chromium. The
crystals are seldom sufficiently large or transparent to cut.
Carbuncle ..........Is the name given to any of the red
varieties when cut en cabochon. It is the name by which most red stones were known to the ancients.
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