Apatite 3 : 無料・フリー素材/写真
Apatite 3 / 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 | (Karl E. Limper Geology Museum collection, Miami University, Oxford, 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 phosphate minerals have one or more phosphate anions (PO4-3).Apatite is the most common & important phosphate mineral. Apatite is actually a group of specific minerals that vary in chemistry. At its simplest, apatite is calcium phosphate, but it has often has other elements thrown in ("garbage can mineral"). The general formula given for apatite is often Ca5(PO4)3(F,Cl,OH) - calcium fluoro-chloro-hydroxyphosphate. Lead, yttrium, manganese, strontium, and other elements can partially substitute in the calcium position. Sulfate, arsenate, vanadate, silicate, and carbonate can partially substitute in the phosphate position. Apatites with F are the fluorapatites. Apatites with Cl are the chlorapatites. Apatites with OH are the hydroxylapatites. Apatite has a nonmetallic luster, can be any color (mottled greens, yellows, and browns are common), has a white streak, is moderately hard (H≡5), and forms hexagonal crystals. Apatite occurs in many igneous rocks, typically granites, pegmatites, and hydrothermal veins. Calcium phosphate is also common in some sedimentary rocks, especially phosphorites, high-phosphate limestones, and bone beds. Apatites are the main components in vertebrate bone and teeth (specifically chlorapatites and hydroxylapatites - they easily convert to fluorapatite upon fossilization/diagenesis).----------------------Exhibit info.:ApatiteLocality UnknownApatite is a phosphate mineral that is primarily used as a source of phosphate in fertilizer manufacturing. It was also used as the phosphor in fluorescent light tubes. Anotehr use is as a source of rare earth elements. Our bones and teeth are made from a variety of apatite mixed with collagen.----------------------Locality: unrecorded----------------------Photo gallery of apatite:www.mindat.org/gallery.php?min=29229 |
| 撮影日 | 2025-04-26 13:52:56 |
| 撮影者 | James St. John |
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