Records of the Geological Survey of India, Volume 76, Issue 6Geological Survey of India, 1942 - Earthquakes |
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Page 11
... important area - the diamonds obtained from a yellow ground passing into a blue ground in a kind of peridotite , also known as Kimberlite . In recent years , however , the alluvial deposits of Africa have become more important . The ...
... important area - the diamonds obtained from a yellow ground passing into a blue ground in a kind of peridotite , also known as Kimberlite . In recent years , however , the alluvial deposits of Africa have become more important . The ...
Page 19
... important area for rubies , and spinel in the world , and they have been formed in the extensive bands or lenticles of crystalline limestone or marble . It was known from the 15th century . Due to the denudation of ener mous quantities ...
... important area for rubies , and spinel in the world , and they have been formed in the extensive bands or lenticles of crystalline limestone or marble . It was known from the 15th century . Due to the denudation of ener mous quantities ...
Page 35
... important technical applica- tion in detecting and registering small variations of pressure , and is utilised for finding the depth of submarines . Grades . There are different varieties of tourmaline , which could be roughly divided as ...
... important technical applica- tion in detecting and registering small variations of pressure , and is utilised for finding the depth of submarines . Grades . There are different varieties of tourmaline , which could be roughly divided as ...
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Common terms and phrases
abrasive Afghanistan alluvial deposits apatite aquamarine Baramunda beryl Bijawar blue ground Brazil brilliant Burma Ruby Mines byon cabochon carats Central India Ceylon Charkhari chrysoberyl cleavage colourless conchoidal conglomerate corundum crystalline limestone cut cabochon cut en cabochon deep diamond-bearing Dispersion district Double Refraction emerald fracture garnets gem corundum gem gravels gem quality gem varieties Geological Survey gneiss Grades granite green greenish hardness Hmyawdwins igneous important India industry jade jadeite Kashmir Kathe known Kurnool Kyatpyin lustre M. S. Krishnan Madras metamorphic methods of mining mineral Mogok Mogok Stone Tract Nephrite obtained occurs olivine opal opaque orthorhombic Panna Panna diamonds pebbles pegmatite Peridot peridotite pleochroism precious stones Price prismatic produced production of diamonds quartz ratis refractive index rock crystals Rubies and sapphire rupees schists South Africa spinel Survey of India topaz tourmaline translucent transparent Twins Ural Mountains valley valuable gem stones Vindhyan Vitreous yellow zircon