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Having very minute crystals.
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The first lithotype is represented by grey to brownish-grey, micro- to cryptocrystalline, medium- (2-10 cm) to thick-bedded (>10 cm), seminodular to nodular limestones.
Blue to purple cryptocrystalline encrustations, also believed to be vivianite, have been found on the clay sediments of the river bank just upstream from the point bar and on gravel on the point bar.
A hypothesis for the use of cryptocrystalline raw materials among Paleolindian groups of North America, in C.
El-Nakheil oil shale is thinly laminated, fissile, and very fine grained to cryptocrystalline, exhibiting obvious lamination and of dark brownish black color.
Cryptocrystalline silica (opal) can precipitate in close proximity to pyrite, and is thought to be derived from weathering of layer aluminosilicate minerals.
At a technical level, flaked glass generally produces far sharper edges than most flakes of stone or mineral--with the exception of crystal quartz, obsidian, ()pal and heat-treated cryptocrystalline silica (cherts, flints etc.
Jasper is an opaque, impure cryptocrystalline quartz, usually red, but also yellow, green, and greyish blue in color.
Differences in reaction products morphology are also observed: their structures range from isotropic to cryptocrystalline.
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).
The connection between the Baltoscandian and Moscow basins obviously broke off in the early Katian corresponding to the Nabala Stage, because the lithology of the sediments overlying the widespread cryptocrystalline limestones of the Rakvere Stage differs from that in the neighbouring Russian areas.
C--Sedimentary deposits: The Magnesite and Hontite of sedimentary origin constitute depositions in isotropic and cryptocrystalline forms inside the sedimentary basins, some of which being economically exploitable.
Its limestone is defined as mudstone, wackstone, off white to white, cream to light brown, brownish gray, soft, amorphous, chalky, cryptocrystalline to microcrystalline, brittle to crumbly, washable, slightly argillaceous, having traces of re-crystallized calcite and having poor to not visible porosity.