Prism (geology)
In
fault troughs.[1]
aquamarine prism with stubby quartz
prismsIn
mineral habit (appearance of a crystal). Prismatic minerals have crystals that show a uniform cross-section. Prismatic crystals typically have 3, 4, 6, 8 or 12 faces which are parallel to a crystallographic axis.[2] The apatite group of minerals commonly exhibit elongated hexagonal prisms.[2]
Accretionary prism
An accretionary prism or accretionary wedge is formed from
tectonic plate at a convergent plate boundary. Most of the material in the accretionary wedge consists of marine sediments scraped off from the downgoing slab of oceanic crust but in some cases includes the erosional products of volcanic island arcs
formed on the overriding plate.
Crystal habit
Crystal habit is an overall description of the visible external shape of a mineral. This description can apply to an individual crystal or an assembly of crystals or aggregates. Predominant crystal faces (prism - prismatic, pyramid - pyramidal and pinacoid - platy). Crystal forms (cubic, octahedral, dodecahedral). Aggregation of crystals or aggregates (fibrous, botryoidal, radiating, massive). Crystal appearance (foliated/lamellar (layered), dendritic, bladed, acicular, lenticular, tabular (tablet shaped)).[3]
See also
References
 | This article needs additional citations for verification. (December 2011) |
- ^ Scientific American (1883). Scientific American, Supplement Volume 16. Vol. 16. Munn and Co. Retrieved 2011-12-08.
- ^ ISBN 0-471-80580-7
- ^ "What are descriptive crystal habits?". Amethyst Galleries. Retrieved 2011-12-08.
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