WebPyroxene-rich chondrules that contain extremely fine-grained, swirling masses of fibrous crystals only a few micrometers in size or smaller are called cryptocrystalline … Webcryptocrystalline ( ˌkrɪptəʊˈkrɪstəlaɪn) adj (Minerals) (of rocks) composed of crystals that can be distinguished individually only by the use of a polarizing microscope Collins …

Chert: Sedimentary Rock - Pictures, Definition, …

WebCryptocrystalline. Having crystals so small that individual crystals cannot be seen under ordinary optical microscope, but are detec table by effect under cross ed polars; a full rotation of a cryptocrystalline material between crossed polars will show the stone transmitting light in all positions. [>>>] Cryptocrystalline: masses made up of ... WebWikipedia Carbonado, a form of diamond, is also cryptocrystalline. From Wikipedia More technically, it is a cone of force that propagates through a brittle, amorphous or … the voice finale december 13 2022

Cryptocrystalline Definition & Meaning Dictionary.com

WebTextures of igneous rocks. Part of the Encyclopedia of Earth Science book series (EESS) Description of igneous rocks requires information about crystallinity, grain size, shape of grains, and mutual relations of grains, in addition to that dealing with the composition of the constituent materials. The rocks can be entirely of crystals ... Chalcedony is a cryptocrystalline form of silica, composed of very fine intergrowths of quartz and moganite. These are both silica minerals, but they differ in that quartz has a trigonal crystal structure, while moganite is monoclinic. Chalcedony's standard chemical structure (based on the chemical structure of quartz) is SiO2 (silicon dioxide). WebThe cryptocrystalline varieties are either translucent or mostly opaque, while the transparent varieties tend to be macrocrystalline. LASER-wikipedia2 The modern stone … the voice finale performances 2022