prosopite
/ˈprɒzə(ʊ)pʌɪt/ /prɒˈsəʊpʌɪt/Mineralogy
noun
A fluoride mineral usually occurring as minute, tabular crystals of a colourless, white, or greyish colour, often altered into pseudomorphs such as fluorite, apatite, and kaolin.
- Prosopite consists of a fluoride and hydroxide of aluminium and calcium, CaAl2(F,OH)8. Crystal system: monoclinic..
Origin
Mid 19th century; earliest use found in James Dana (1813–1895), geologist, zoologist, and teacher. From German Prosopit from ancient Greek πρόσωπον face, mask + German -it, so called in allusion to its deceptive (i.e. pseudomorphic) character.
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