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  • noun

Words related to cassiterite

a hard heavy dark mineral that is the chief source of tin

References in periodicals archive ?
Over the ensuing years, these specimens have been followed by more than 30 "best of species," including orange scheelite crystals to 20 cm, lustrous black cassiterite crystals to 15 cm, ferberite, arsenopyrite, fluorite of all colors, pyromorphite, mimetite, and rarities such as kermesite, helvite, stannite, kesterite and even common minerals such as calcite and quartz.
"Pingwu," "Songpan," "Mount Xuebaoding," "Xue Bao Diang" and occasionally "Huya" are the locality designations generally cited for specimens of orange scheelite associated with cassiterite and beryl from Sichuan Province in central China.
Generally, the abundance of accessory minerals (topaz, cassiterite, columbite-tantalite, microlite, and Li-Be phosphates) tends to increase upward from the B3 to the B1 facies, the latter being the most evolved.
Nigeria's present-day non-oil mineral resources can be broadly categorised into five groups: Industrial minerals (barite, kaolin, gypsum, feldspar and limestone); Energy minerals (such as bitumen, lignite and uranium); Metallic ore minerals (such as gold, cassiterite, columbite, iron ore, lead-zinc and copper); Construction minerals (such as granite, gravel, laterite and sand) and Precious stones (such as topaz, amethyst, tourmaline, sapphires, emeralds and garnets).
The company's Green Compliance Service Center in Asia actively surveys suppliers to determine whether any Conflict Minerals (columbite-tantalite [coltan]; cassiterite [tin]; gold; wolframite [tungsten]; or their derivatives) used to make product components were procured from "covered countries" such as Angola, Burundi and Rwanda.
John Bradshaw, Coast-to-Coast Rare Stones International, Nashua, New Hampshire, USA, for 21 bags containing part-cut crystals of: apatite (Canada and Mexico), cassiterite (Namibia), celestine (Kansas, USA), cerrusite (Namibia), crocoite (Tasmania, Australia), diaspore (Turkey), oligoclase (Kenya), pollucite (Conneticut, USA), scheelite (Pakistan and Arizona, USA), smithsonite (Namibia), sphalerite (Spain), tourmaline (Maine, USA, and Afghanistan), tugtupite (Greenland), willemite/leucophoenicite (New Jersey, USA) and zincite on calcite (New Jersey); and also for 95 faceted mixed-shape tourmalines, mostly pink, green and blue.
The heavy mineral concentrates mainly consist of Fe-Ti oxides--rutile and ilmenite, widespread cassiterite, wolframite and scheelite.
The ore pockets are globular or even irregular bodies tens of centimetres in size, with a very high proportion of cassiterite. Quartz, Li-micas, fine flakes of muscovite, and clay minerals (dickite, kaolinite, very rare cookeite) are the accompanying minerals of these ore pockets.
A small formation of cassiterite Sn[O.sub.2] (JCPDS 21-1250) is observed in the unwashed system.
The minerals in question--coltan, a source of tantalum; cassiterite, a tin oxide ore; wolframite, which produces tungsten; and gold ores are often extracted under conditions that breach basic human rights using slave labour and child labour.
Four minerals have been targeted - coltan, a source of tantalum; cassiterite, a tin oxide ore; wolframite, which produces tungsten; and gold ores.
Minerals such as cassiterite, coltan and wolfram are a growing part of Rwanda's economy, partly due to ongoing reforms and substantial investments in the sector--Rwanda invested $46.8m in the mineral sector in 2012 alone--but also due to high prices on the international market.