| Black Sand |
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Information AboutBlack Sand |
| CATEGORIES ABOUT BLACK SAND | |
| economic geology | |
| sediments | |
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Black sand is a heavy, glossy, partly Magnetic mixture of usually fine sands, found as part of a Placer Deposit . Black sands are used by miners and prospectors to indicate the presence of a placer formation. Placer mining activities produce a concentrate that is composed mostly of black sand. Black sand concentrates often contain additional valuables, other than precious metals: Rare Earth elements, Thorium , Titanium , Tungsten , Zirconium and others are often fractionated during Igneous processes into a common mineral-suite that becomes black sands after weathering and erosion. Several Gemstone s, such as Garnet , Topaz , Ruby , Sapphire , and Diamond are found in placers and in the course of placer mining, and sands of these gems are found in black sands and concentrates. Purple or ruby-colored garnet sand often forms a showy surface dressing on ocean beach placers. SEE ALSO EXTERNAL LINKS |
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