cryptocrystalline


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cryp·to·crys·tal·line

(krip'tō-kris'tă-lēn),
Having very minute crystals.
References in periodicals archive ?
Red earthy gravels also exhibited a cryptocrystalline fabric, but with a much lower degree of impregnation by oxides, which were concentrated near pores or surfaces between light-coloured domains, forming a reticulate pattern (Fig.
This is caused by formation of cryptocrystalline mullite, and the value of effect depends on the content clay and gibbsite in the ceramic masses.
Classic Neuburg Siliceous Earth is a mixture of lamellar kaolinite and corpuscular, cryptocrystalline and amorphous silica.
The primitive microstructure at the bottom of HAZ consists of abundant pearlite and minute quantity of ferrite, whereas the composition of the microstructure at the top of HAZ is rich in ferrite with some needlelike or cryptocrystalline martensite and blocky cementite at eutectoid temperature.
where ts is the thickness of the surface layer and rc is the radius of the cryptocrystalline Ge-nc core which approximates to half of the crystallite size measured from XRD.
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.
Alkali-Silica Reaction in some concrete structures of Tarbela Dam was the result of greywacke and rocks containing micro and cryptocrystalline silica.
The dolomitic part of K1 is characterized to be mudstone, mudstone to packstone, beige, moderately hard to hard, crystalline to cryptocrystalline, have occasional pelloids, pebbles and shell fragments, have local mudcracks in mudstone, slightly argillaceous in parts, have thin layers of anhydrite and o have good to fair vuggy and intercrystalline porosity.
You won't see any crystal structure in this green stone as it's a cryptocrystalline mineral with the slightly ungainly name of chrysoprase, cryptocrystalline referring to the microscopic nature of its crystals.
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.
Crystals are small (<3 mm maximum diameter) and include rounded embayed quartz, subhedral K-feldspar (anorthoclase, based on the presence of fine-scale cross-hatch twinning), and subhedral plagioclase set in a locally spherulitic groundmass of cryptocrystalline quartz and feldspar.