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Ch. 18: Tourmaline

Ch. 17: Garnet Page of 187 Ch. 18: Tourmaline Text size:minus plus Restore normal size   Mail page  Print this page
crystalline and metamorphic rocks in the Nellore district; near Sankaridrug, Salem district; near Konibetta in the Nilgiris. Brownish red to deep red or pink garnets are obtained near Mel Amathur, Tinnevelli district and small garnets of a rich colour are obtained in Travancore.
Rajputana has garnet mines along the outcrops of the Aravalli schists, which are traversed by granites and be­tween the Udaipur and Jaipur States. A large trade once existed between the mines and Delhi. Garnet is also obtained at Ajmer, Jaipur, Kishengarh and Shahpura. The Kishengarh garnets are said to be the finest in India. Ceylon also produces a lot of almandine or gem garnets.
Industry
Rajputana garnets are often of gem quality and are mined intermittently. The stones are cut in Jaipur and Delhi, where gem-cutting forms an important industry. A portion is also exported and goes to London. The Warangal garnets were sent to Madras and also to Europe. Tinnevelli garnets are mostly used for abrasives.
Marketing and future trend
Gem garnets form cheap precious stones and can always find a fair market. The inferior garnets could find a market when the indigenous abrasive industry is gradually developed.
Chapter XVIII TOURMALINE
Introduction
TOURMALINE is a boroalumino-silicate of very complex composition. It crystallizes in the rhombohedral-hemi-morphic system being different at the two ends of the crystals. The crystals form curved triangular prisms! The
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Ch. 17: Garnet Page of 187 Ch. 18: Tourmaline
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