| 41. | Olivine sand requires less water than silica sands while still holding the mold together during handling and pouring of the metal.
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| 42. | Silica sand are used for Moulding sand, Sodium silicate, Ceramic, glass etc . Quartzites are found in Orvakal of Kurnool district.
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| 43. | The top layer consists of cryogenic rubber with the middle being a combination of cryogenic rubber and a silica sand mix.
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| 44. | Floors often consist of a top layer of 100mm of silica sand over a complex aggregate substrate designed to ensure proper drainage.
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| 45. | The process begins when the crystal mix _ silica sand, potash and litharge _ is transformed into molten crystal in huge furnaces.
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| 46. | It was closed as a coal mine in the early 1900s and ended operation as a silica sand mine in the late 1940s.
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| 47. | Currently much of the former Kasota quarry is occupied by Unimin Corporation, who mine silica sand for hydraulic fracturing ( " fracking " ).
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| 48. | It is located in a chamber that Greathouse dug out to extract the silica sand, and, for being underground, the room is quite spacious.
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| 49. | The output of silica sand in 1997 totalled 205, 000 tonnes, a 24 per cent reduction from the 1996 output of 268, 800 tonnes.
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| 50. | The key ingredient of Murano glass is not the silica sand, the soda ash or the red lead that are melted together to make it.
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