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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
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  • 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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