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heavy mineral
In geology, a heavy mineral is one with a density that is greater than 2.9 g/cm3, most commonly referring to dense components of siliciclastic sediments. A heavy mineral suite is the relative percentages of heavy minerals in a stone. Heavy mineral suites are used to help determine the provenance and history of sedimentary rocks.〔〔(【引用サイトリンク】url=http://walrus.wr.usgs.gov/infobank/programs/html/facilities/mp/15.3/m3005a.html )〕
As heavy minerals are a minor constituent of most sedimentary rock, they must be separated out to be studied.〔 Heavy mineral separation generally uses a dense liquid in either a separatory funnel or centrifuge.〔 Liquids used include bromoform, tetrabromoethane, tribromoethane, methylene iodide, and polytungstate liquids.〔〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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