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| Feldspath | { , n. [ G. feldspath; feld field + spath spar. ] (Min.) A name given to a group of minerals, closely related in crystalline form, and all silicates of alumina with either potash, soda, lime, or, in one case, baryta. They occur in crystals and crystalline masses, vitreous in luster, and breaking rather easily in two directions at right angles to each other, or nearly so. The colors are usually white or nearly white, flesh-red, bluish, or greenish. [ 1913 Webster ] ☞ The group includes the monoclinic (orthoclastic) species orthoclase or common potash feldspar, and the rare hyalophane or baryta feldspar; also the triclinic species (called in general plagioclase) microcline, like orthoclase a potash feldspar; anorthite or lime feldspar; albite or soda feldspar; also intermediate between the last two species, labradorite, andesine, oligoclase, containing both lime and soda in varying amounts. The feldspars are essential constituents of nearly all crystalline rocks, as granite, gneiss, mica, slate, most kinds of basalt and trachyte, etc. The decomposition of feldspar has yielded a large part of the clay of the soil, also the mineral kaolin, an essential material in the making of fine pottery. Common feldspar is itself largely used for the same purpose. Variants: Feldspar | | Feldspathose | { , a. Pertaining to, or consisting of, feldspar. [ 1913 Webster ] Variants: Feldspathic |
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| | | feldspar | เฟลด์สปาร์, แร่ฟันม้า [ธรณีวิทยา๑๔ ม.ค. ๒๕๔๖] |
| | Feldspar | หินฟันม้า [TU Subject Heading] | | feldspar | เฟลด์สปาร์, แร่ชนิดหนึ่งเป็นผลึกสารประกอบ ซึ่งส่วนใหญ่ประกอบด้วยอะลูมิเนียมซิลิเกตของโพแทสเซียม หรือของโซเดียม หรือของแคลเซียม ความแข็งประมาณ 6ความถ่วงจำเพาะ 2.55-2.71 มีสีต่าง ๆ กันขึ้นอยู่กับองค์ประกอบของแร่ [พจนานุกรมศัพท์ สสวท.] | | Feldspar industry | อุตสาหกรรมหินฟันม้า [TU Subject Heading] |
| | | ฟันม้า | (n) feldspar, Syn. เฟลด์สปาร์, Thai Definition: แร่ประกอบหินชนิดหนึ่ง มีหลายสี ส่วนมากมักมีสีขาวขุ่นคล้ายฟันม้า | | เฟลด์สปาร์ | (n) feldspar, Syn. หินฟันม้า, ฟันม้า, Thai Definition: ชื่อแร่ประกอบหินชนิดหนึ่ง มีหลายสี ส่วนมากมักมีสีขาวขุ่นคล้ายฟันม้า, Notes: (อังกฤษ) |
| | ฟันม้า | [fanmā] (n) EN: feldspar | | เฟลด์สปาร์ | [fēlspā] (n) EN: feldspar FR: feldspath [ m ] |
| | | | feldspar | (n) any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium, Syn. felspar |
| | Feldspath | { , n. [ G. feldspath; feld field + spath spar. ] (Min.) A name given to a group of minerals, closely related in crystalline form, and all silicates of alumina with either potash, soda, lime, or, in one case, baryta. They occur in crystals and crystalline masses, vitreous in luster, and breaking rather easily in two directions at right angles to each other, or nearly so. The colors are usually white or nearly white, flesh-red, bluish, or greenish. [ 1913 Webster ] ☞ The group includes the monoclinic (orthoclastic) species orthoclase or common potash feldspar, and the rare hyalophane or baryta feldspar; also the triclinic species (called in general plagioclase) microcline, like orthoclase a potash feldspar; anorthite or lime feldspar; albite or soda feldspar; also intermediate between the last two species, labradorite, andesine, oligoclase, containing both lime and soda in varying amounts. The feldspars are essential constituents of nearly all crystalline rocks, as granite, gneiss, mica, slate, most kinds of basalt and trachyte, etc. The decomposition of feldspar has yielded a large part of the clay of the soil, also the mineral kaolin, an essential material in the making of fine pottery. Common feldspar is itself largely used for the same purpose. Variants: Feldspar |
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