Calcite crystals (Custar Stone Quarry, Wood County, Ohio, USA) 1 : 無料・フリー素材/写真
Calcite crystals (Custar Stone Quarry, Wood County, Ohio, USA) 1 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Calcite from Ohio, USA.A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are over 6100 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates.The carbonate minerals all contain one or more carbonate (CO3-2) anions.Calcite is a common mineral. It is calcium carbonate (CaCO3). It has a nonmetallic luster, commonly clearish to whitish to yellowish to grayish in color, is moderately soft (H≡3), moderately light-weight, has six-sided crystals (calcite is actually in the trigonal crystal system - crystals of calcite are often scalenohedrons), and rhombohedral cleavage (three cleavage planes at 75º & 105º angles - cleavage pieces look like lopsided boxes). The easiest way to identify calcite is to drop acid on it - it easily bubbles (effervesces) in acid. The bubbles are carbon dioxide gas. If the acid is dilute hydrochloric acid, the chemical reaction is: 2HCl(aq) + CaCO3(s) -->> CO2(g)↑ + H2O(l) + CaCl2(aq) The most important & voluminous calcitic rocks in the world are limestone (sedimentary), marble (metamorphic), carbonatite (igneous), and travertine (speleothem, or "cave formations", and many hotspring deposits). Quite a few hydrothermal veins in the world are calcitic or have calcite as a principal component.Seen here are honey-colored crystals from the Custar Quarry in northwestern Ohio. The rocks at the quarry are Middle Devonian carbonates of the Detroit River Group and Dundee Formation. Other reported minerals at the site include barite, celestite, dolomite, fluorite, glauconite, hexahydrite, marcasite, pyrite, and sphalerite (see Carlson, 1991 - Minerals of Ohio.).Locality: Custar Stone Quarry (also known as the Pugh Quarry), ~6 kilometers north-northwest of the town of Custar & ~7 kilometers west-southwest of the town of Weston, Wood County, northwestern Ohio, USA---------------------Photo gallery of calcite:www.mindat.org/gallery.php?min=859 |
| 撮影日 | 2025-06-02 16:27:49 |
| 撮影者 | James St. John |
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