Quartz (Milky) : 無料・フリー素材/写真
Quartz (Milky) / The White Wоlf
| ライセンス | クリエイティブ・コモンズ 表示-改変禁止 2.1 |
|---|---|
| 説明 | Milky Quartz is the most common variety of crystalline quartz and can be found almost anywhere. The white color may be caused by minute fluid inclusions of gas, liquid, or both, trapped during the crystal formation. The cloudiness caused by the inclusions effectively bars its use in most optical and quality gemstone applicationsQuartz is an essential constituent of granite and other felsic igneous rocks. It is very common in sedimentary rocks such as sandstone and shale and is also present in variable amounts as an accessory mineral in most carbonate rocks. It is also a common constituent of schist, gneiss, quartzite and other metamorphic rocks. Because of its resistance to weathering it is very common in stream sediments and in residual soils.Quartz occurs in hydrothermal veins as gangue along with ore minerals. Large crystals of quartz are found in pegmatites. Well-formed crystals may reach several meters in length and weigh hundreds of kilograms.Naturally occurring quartz crystals of extremely high purity, necessary for the crucibles and other equipment used for growing silicon wafers in the semiconductor industry, are expensive and rare. A major mining location for high purity quartz is the Spruce Pine Gem Mine in Spruce Pine, North Carolina.For more info please visiten.wikipedia.org/wiki/QuartzTaken by: WolfThis work is licensed under a Creative Commons Attribution-NoDerivs 3.0 Unported License. |
| 撮影日 | 2010-07-02 14:42:53 |
| 撮影者 | The White Wоlf , Ontario, Oregon, U.S.A. |
| タグ | |
| 撮影地 | Burns, Oregon, United States 地図 |
| カメラ | SP590UZ , OLYMPUS IMAGING CORP. |
| 露出 | 0.025 sec (1/40) |
| 開放F値 | f/2.8 |