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Ch. 6: Ruby, Sapphire, Spinel etc.

Ch. 6: Ruby, Sapphire, Spinel etc. Page of 295 Ch. 6: Ruby, Sapphire, Spinel etc. Text size:minus plus Restore normal size   Mail page  Print this page
The Garnet.                    143
common garnet is essentially a silicate of alumina iron.
The others have various bases, such as lime, magnesia,
oxide of manganese, etc.
Mineralogists have divided them under the following
heads :—
Alumina lime garnet.
Alumina magnesia garnet.
Alumina iron garnet.
Alumina manganese garnet.
Iron lime garnet.
Lime chrome garnet.
It will suffice here to give the analyses of the most important varieties.
The composition of the almandine is—
Of the essonite, or cinnamon-stone—
Of the pyrope, or Bohemian garnet—
Ch. 6: Ruby, Sapphire, Spinel etc. Page of 295 Ch. 6: Ruby, Sapphire, Spinel etc.
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