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Acicular (crystal habit) : ウィキペディア英語版 | Acicular (crystal habit) __NOTOC__ Acicular, in mineralogy, refers to a crystal habit composed of a radiating mass of slender, needle-like crystals. Minerals with this habit tend to be fragile. Complete, undamaged acicular specimens can be uncommon. ==Examples== Minerals with an acicular habit include mesolite, natrolite,〔Hamilton, W.R. et al. (1974) ''The Hamlyn Guide to Minerals, Rocks and Fossils'', London, Hamlyn, page 9.〕 malachite, gypsum, rutile, brochantite, bultfonteinite and dimethyltryptamine.〔Bergin, Rolph. et al. (1968) ''Preliminary X-ray Crystallographic study of some psychoactive indole bases'', Stockholm, Karolinska Institutet, page 1〕
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