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is from Brazil and Madagascar. Cavities containing liquid with a movable bubble are sometimes present.
Amethyst
is obtained from Brazil, Ceylon, India, Madagascar, Persia, Mexico,
Maine, Pennsylvania, Carolina and Lake Superior districts. Material of
gem quality is obtained in the gem gravels of Ceylon. Rose quartz is
obtained from Japan, Madagascar, Bavaria, France, Brazil, etc. Smoky
quartz comes from Ceylon, Alps, Cairngorm, Scotland, etc. Citrine comes
from Brazil.
India.—Rock
crystals have been obtained from several localities. Rose quartz is
obtained in Sambalpur in Orissa as well as rock crystals. In Bombay
rock crystal is obtained from Tankara, and taken by the lapidaries of
Cambay. In Central Provinces, it is obtained from Chindwara and at
Warangal in Hyderabad. In Madras it occurs in Godavari near Rajahmundry
and at Tanjore, where it is called the ' Vallam' diamond, and also
smoky quartz and Cairngorm derived from a conglomerate. Rose quartz
occurs in Vizagapatam. In the Punjab it occurs at Delhi, from Delhi
quartzite and from Mianwalli called ' Mari diamonds'. It is collected
and drilled to be made into necklaces. Amethyst occurs in Bihar, in
Santal Parganas in a bed of chalcedony two miles west of Burhait (24°
53' : 87° 40') and in the Central Provinces small crystals in the
Deccan Trap geodes.
Other Varieties
Agate varieties.—Carnelian,
onyx, etc., are found in lavas of amygdaloidal flows of Deccan and
Rajmahal traps, the sources being the rivers that drain the areas
covered by the rocks in Kistna, Godavari and Bhima rivers—Jubbulpore.
In Bihar, Rajmahal hills, 2 miles north of Burhait, a bed of agate is
present in the centre of the hills for 1 to 2 miles.
Bombay.—Agate is worked at Cambay, and obtained from Ahmedabad, Kaira and Kathiawar (moss agate).
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