Parisite-(Ce)

Parisite is a rare mineral consisting of cerium, lanthanum and calcium fluoro-carbonate, Ca(Ce,La)₂(CO₃)₃F₂. Parisite is mostly parisite-(Ce), but when neodymium is present in the structure the mineral becomes parisite-(Nd).

It is found only as crystals, which belong to the trigonal or monoclinic pseudo-hexagonal system and usually have the form of acute double pyramids terminated by the basal planes; the faces of the hexagonal pyramids are striated horizontally, and parallel to the basal plane there is a perfect cleavage. The crystals are hair-brown in color and are translucent. The hardness is 4.5 and the specific gravity is 4.36. Light which has traversed a crystal of parisite exhibits a characteristic absorption spectrum.

单词	parisite
释义	parisite /'pæri,sait/ 英汉-汉英词典 n. 氟碳钙铈矿词组 \| 习惯用语您要查找的是不是： perquisite n. 额外补贴；临时津贴 parasite n. 寄生生物；寄生虫；寄生植物；依赖他人过活者 parasitic adj. 寄生的；由寄生虫引起的；靠他人为生的 parricide n. 杀父母（罪）；杀尊亲；叛逆 tripartite adj. 三重的,分成三部分的 parisite n. [矿物] 氟碳钙铈矿网络短语: parisite e 氟碳钙铈矿英语百科 Parisite-(Ce) Parisite is a rare mineral consisting of cerium, lanthanum and calcium fluoro-carbonate, Ca(Ce,La)₂(CO₃)₃F₂. Parisite is mostly parisite-(Ce), but when neodymium is present in the structure the mineral becomes parisite-(Nd). It is found only as crystals, which belong to the trigonal or monoclinic pseudo-hexagonal system and usually have the form of acute double pyramids terminated by the basal planes; the faces of the hexagonal pyramids are striated horizontally, and parallel to the basal plane there is a perfect cleavage. The crystals are hair-brown in color and are translucent. The hardness is 4.5 and the specific gravity is 4.36. Light which has traversed a crystal of parisite exhibits a characteristic absorption spectrum.
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parisite /'pæri,sait/

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网络短语:

Parisite-(Ce)