cryptocrystalline वाक्य
उदाहरण वाक्य
मोबाइल
- More technically, it is a cone of force that propagates through a brittle, amorphous or cryptocrystalline solid material from a point of impact.
- Chrysoprase is cryptocrystalline, which means that it is composed of crystals so fine that they cannot be seen as distinct particles under normal magnification.
- Obsidian is a great example of a material that is perfect for making tools with, as it is both cryptocrystalline and it fractures conchoidally.
- This is thought to be because chalcedony is extremely finely grained ( cryptocrystalline ), and so has a very high surface area to volume ratio.
- "' Chert "'( ) is a fine-grained silica-rich microcrystalline or cryptocrystalline sedimentary rock that may contain small fossils.
- Its lowermost member of up to 20 m thickness is composed of grey to cream-coloured, rudist bearing, " cryptocrystalline limestones ".
- Pyroxene-rich chondrules that contain extremely fine-grained, swirling masses of fibrous crystals only a few micrometers in size or smaller are called " cryptocrystalline " chondrules.
- On the high ( er ) energy side of the individual reefs, the more clastic dominated members formed, whereas in the calm inner lagoon, the cryptocrystalline and micritic members were deposited.
- Ground stone tools are usually made of basalt, rhyolite, granite, or other cryptocrystalline and igneous stones whose coarse structure makes them ideal for grinding other materials, including plants and other stones.
- Two stone characteristics will determine whether one is able to chip away big enough flakes to make tools out of : whether the stone is of a cryptocrystalline structure, and how conchoidally the stone fractures.
- Comparing Klasies River mouth and Border Cave deposits, more blades and geometric flakes from non-local cryptocrystalline siliceous rock were found in Klasies River Mouth and more blades of chalcedony were found in Border Cave.
- The agate was designated as the state's first official rock in 1969 . A form of cryptocrystalline quartz ( chalcedony ) that is regarded as a semiprecious gemstone, agate is found in several areas in the state.
- The most important distinction between types of quartz is that of " macrocrystalline " ( individual crystals visible to the unaided eye ) and the microcrystalline or cryptocrystalline varieties ( aggregates of crystals visible only under high magnification ).
- The groundmass of these rocks is often aphanitic microcrystalline, with a web of minute feldspars mixed with interstitial grains of quartz or tridymite; but in many dacites it is largely vitreous, while in others it is felsitic or cryptocrystalline.
- Cryptocrystalline or amorphous stone such as chert, flint, obsidian, and chalcedony, as well as other fine-grained stone material, such as rhyolite, felsite, and quartzite, were used as a source material for producing stone tools.
- Some of the exotic materials included : cryptocrystalline quartz, blue-green nodular chert, Dover chert, novaculite, quartz, vein quartz, chalcedony, Horse Mountain agate, sandstone, hematite, steatite, slate, green slate, banded slate and igneous rock.
- Many sandstones are held together by an infinitesimal amount of colloid or cryptocrystalline silica; when freshly dug from the quarry they are soft and easily trimmed, but after exposure to the air for some time they become much harder, as their siliceous cement sets and passes into a rigid condition.
- Silica occurs in 3 forms : crystalline, microcrystalline ( or cryptocrystalline ) and amorphous ( non-crystalline ) . " Free " silica is composed of pure silicon dioxide, not combined with other elements, whereas silicates ( e . g ., talc, asbestos, and mica ) are SiO 2 combined with an appreciable portion of cations.
- Cross sections of different micrometeorite classes : a ) Fine-grained unmelted; b ) Coarse-grained Unmelted; c ) Scoriaceous; d ) Relict-grain Bearing; e ) Porphyritic; f ) Barred olivine; g ) Cryptocrystalline; h ) Glass; i ) CAT; j ) G-type; k ) I-type; and l ) Single mineral.
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