Quartz and ferruginous organic debris were found in micritic limestone whose cement was a mixture of
cryptocrystalline calcite and clay minerals.
The classical Neuburg SE is thermoanalytically investigated specimens contain a combination of amorphous and
cryptocrystalline Si[O.sub.2] modifications and do not show quartz transformation behavior at 573[degrees]C; and cannot be produced even approximately by synthesis or by the mixture or ad-mixture of native components of a Si[O.sub.2] modification with kaolinite [17], Both mineral phases of SE build up a distinctive conglomerate, and the combination of round-shaped particles and nanoplatelets give its unique structure.
Cryptocrystalline pyrite 'dust' occurs throughout and pyritic aggregates are seen in some horizons.
Gitari, "Simultaneous removal of metal species from acidic aqueous solutions using
cryptocrystalline magnesite/bentonite clay composite: an experimental and modelling approach," Journal of Cleaner Production, vol.
The LF-chalcedony is a
cryptocrystalline a-quartz (Si[O.sub.2]) that is 50-100 nm in size (Rios et al., 2001) and contains chemically bound hydroxyl groups in the form of silanole (SiOH) and molecular water ([H.sub.2]O) (Florke et al., 1982; Graetsch et al., 1985).
The corresponding SEM images (Figure 4) confirmed that the hematite ore consisted mainly of scaly, acicular,
cryptocrystalline, and metasomatic textures, with a sand consolidation structure (rarely, with an oolitic structure).
After CBD extraction, some of these gravels showed a colourless,
cryptocrystalline, irregular and porous fabric within which Fe oxides were still present (Fig.
It was found that the Indus bed material used in the construction of Tarbela Dam contained slow reactive aggregates like greywacke and
cryptocrystalline silica, which caused ASR (Majid et al., 2013).
The term garttamalga refers to white
cryptocrystalline silica.
Most are a variety of
cryptocrystalline silicates, divided into fibrous chalcedony, granular cherts, and microcrystalline silicates (MCS), distinguished by coarser grains visible under a hand lens.