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showing acicular crystal habit]] __NOTOC__ Acicular, in mineralogy, refers to a crystal habit composed of slender, needle-like crystals. Crystals with this habit tend to be fragile. Complete, undamaged acicular specimens are uncommon. The term "acicular" derives from the Late Latin "acicula" meaning "little needle". Strictly speaking, the word refers to a growth habit that is slender and tapering to a point. Prismatic crystals are not acicular; however, colloquial usage has altered the commonly understood meaning of the word. When writing for mineralogical publications, authors should restrict their usage of "acicular" to crystals with the tapering growth habit. To add to the confusion, some minerals are described with various morphological terms. For example, natrolite is often described as slender prismatic and millerite is often described as filiform or capillary.

Examples

Minerals with an acicular habit include mesolite, natrolite, malachite, gypsum, rutile, brochantite and bultfonteinite. Crystals of dimethyltryptamine have an acicular habit,Bergin, Rolph. et al. (1968) ''Preliminary X-ray Crystallographic study of some psychoactive indole bases'', Stockholm, Karolinska Institutet, page 1 but this substance is not regarded as a mineral by the International Mineralogical Association.

Differences from other habits

Some minerals like creedite form prismatic crystals that appear to be acicular, but are instead prismatic in a bladelike form; these can be told apart by the fact that all prismatic crystals are less sharp, sometimes are tipped with a pyramidal shape, and keep a standard cross-section shape with straight edges. Acicular crystals differ from fibrous crystals in their thickness; crystals with a fibrous habit are much thinner, sometimes to the point of being flexible like hair, while acicular crystals are thicker and rigid.

See also

right|thumb|Needle-shaped acicular millerite_crystals_on_white_[[quartz_.html" style="text-decoration: none;"class="mw-redirect" title="quartz.html" style="text-decoration: none;"class="mw-redirect" title="millerite crystals on white [[quartz">millerite crystals on white [[quartz ">quartz.html" style="text-decoration: none;"class="mw-redirect" title="millerite crystals on white [[quartz">millerite crystals on white [[quartz *[[Zeolite]] *[[Abnormal grain growth]]

References


galleries.com - WHAT ARE DESCRIPTIVE CRYSTAL HABITS? - Aciclar

mindat.org - Definition of acicular


External links



, Biological Bulletin {{mineral-stub Category:Mineral habits