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cryptocrystalline

   Also found in: Encyclopedia, Wikipedia 0.03 sec.
cryp·to·crys·tal·line  (krpt-krst-ln, -ln)
adj.
Having a microscopic crystalline structure.

cryptocrystalline [ˌkrɪptəʊˈkrɪstəlaɪn]
adj
(Earth Sciences / Minerals) (of rocks) composed of crystals that can be distinguished individually only by the use of a polarizing microscope

cryptocrystalline  (krpt-krst-ln, -ln)
Having a microscopic crystalline structure, as the mineral chalcedony does.


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? Mentioned in ? References in periodicals archive
 
Galena is present mainly as the common coarse-grained, well-crystallized and friable type, but also displays several other textures, such as fine-grained, sheared, massive, and 'steel' (a dense, extremely fine-grained, almost cryptocrystalline type).
Gold mineralization occurs primarily in altered, pyrite-bearing argillites and occasionally siltstones, and in the underlying massive sandstones with zones of grey cryptocrystalline quartz veining and strong silicification.
Gold mineralization is closely associated with pyrite in altered argillites, and occasionally in siltstones and the footwall massive sandstone where it is mainly related to zones of cryptocrystalline grey quartz veining with strong silicification haloes.
 
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