Pink halite (Holocene; Searles Lake, near Trona, California, USA) 1 : 無料・フリー素材/写真
Pink halite (Holocene; Searles Lake, near Trona, California, 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 |
|---|---|
| 説明 | Halite from the uppermost Holocene of California, USA. (~2.6 centimeters across at its widest)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 5500 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 halides are the "salt minerals", and have one or more of the following anions: Cl-, F-, I-, Br-.Halite is true salt, which consists of sodium chloride (NaCl). This is the same chemical long used as flavoring on food & as a preservative. It has a nonmetallic luster, typically clearish/coloress, and is relatively soft (H = 2.5). Halite forms cubic crystals and has cubic cleavage (= 3 cleavage planes meeting at 90º angles). Halite is most readily identified by its strongly salty taste. Halite has economic value. In addition to its use in food, salt is traditionally used in large quantities in wintertime to prevent roadways from icing up. Halite is principally mined from ancient rock salt successions. Rock salt is a chemical sedimentary rock composed of halite and formed by evaporation of seawater.Seen here is a small cluster of pink halite from Searles Lake in California. Through geologic time, the lake has alternated between having water and being dry. What little water does occur in modern Searles Lake is highly saline. When the water evaporates, halite precipitates. The pinkish coloration is from incorporation of pigments (carotenoids) in halophilic archaea and algae that live in the water.Locality: Searles Lake, next to the town of Trona, far-northwestern San Bernardino County, southern California, USA------------------------Photo gallery of halite:www.mindat.org/gallery.php?min=1804------------------------See info. at:en.wikipedia.org/wiki/Searles_Lake |
| 撮影日 | 2020-01-21 21:15:27 |
| 撮影者 | James St. John |
| タグ | |
| 撮影地 |