black sand

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black sand

Accumulation of fragments of durable, usually dark, heavy minerals (those with a density greater than that of quartz). These accumulations are found in streambeds or on beaches where stream flow and wave energy are sufficient to carry away low-density material but not the heavy minerals. Thus, heavy minerals resistant to weathering and abrasion concentrate in these areas, though they may be only minor constituents of inland rocks. Placer mining of such deposits yields magnetite, cassiterite, and zircon, as well as gold, platinum, and other rare metals.

black sand [¦blak ′sand]

(geology)

Heavy, dark, sandlike minerals found on beaches and in stream beds; usually magnetite and ilmenite and sometimes gold, platinum, and monazite are present.

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No references found			At last the pan seemed empty of everything but water; but with a quick semicircular flirt that sent the water flying over the shallow rim into the stream, he disclosed a layer of black sand on the bottom of the pan. Moon-Face and Other Stories by London, Jack View in context He shoveled black sand into an iron receptacle and pounded it tight and set it aside to harden; then it would be taken out, and molten iron poured into it. The Jungle by Sinclair, Upton View in context			black pepper black pepper oil black plate black pod Black Poetry Day black point black poodle Black Poplar Black Powder Black Power Black Prince black print black quarter black ring Black River Black River State Forest Black Rock Desert Black Rock Mountain State Park Black Rock State Park Black Rod black root Black Root of Beets black root rot Black Rot Black Rust black sand Black Sands Beach State Marine Park Black Sandy State Park black scope black scour Black Screen of Death Black Sea Black Sea Cossack Host Black Sea Fleet Black Sea Highway Black Sea Lowland Black Sea Mutiny in the French Fleet Black Sea Preserve Black Sea Straits black shale black shank Black Ships Festival Black Shirts black signal black silicon black silver black smoke black smoker black snake black snow Black Sox Scandal			Black Rose Black Rose Acoustic Society Black Rose Dragon black rot black rot Black Router Network Black Rubber Ribbed Matting black rudder fish black rudderfish black run Black Runed Dagger Black Russian Black Russian (cocktail) Black Russian Terrier Club of America, Inc. Black rust Black rust Black Sabbath black sage Black Sails in the Sunset black sally black sally wattle black salsifies black salsify Black salts black saltwort Black sambuca black sand Black Sands Beach State Marine Park Black Sandy State Park Black sapota black sapote Black Sash Black Saturday (Cuban Missile Crisis) Black Saturday (Cuban Missile Crisis) Black Scholes Black Scholes Black Scholes Model Black Scholes Model Black Scholes Option Pricing Model Black Scholes Option Pricing Model Black Science Forum black scope black scour black scour worm black scours Black screen Black Screen of Death Black Screen of Death Black Sea Black Sea black sea bass Black Sea Biotechnology Association Black Sea Coastal States Black Sea Consulting Black Sea Cooperation Forum Black Sea Cooperation Organisation Black Sea Cossack Host

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