Polycrystalline (n) A polycrystalline material is made of several smaller crystallites (single crystals).
Polymorphism (n) Meaning "many forms", a single chemical composition can exist with two or more different crystal structures.
Powder diffraction (XRD) is a technique use to characterize the crystallographic structure, crystallite size (grain size), and preferred orientation in polycrystalline or powdered solid samples.
Carbonado is characterized as a natural polycrystalline diamond that has its origin in the alluvial deposits in the Central African Republic and Brazil. This diamond appears black and is highly permeable and is used for diamond maneuvers.
Carbonado is a natural polycrystalline diamond that is usually found in alluvial deposits - sand and soil sediment deposited by running water often along river banks - in central Africa and Brazil.
Monoclinic; occurs as massive polycrystalline aggregates
Fracture
Granular to splintery ...
Other crater-related diamonds are larger. In the 35-mile-wide Popigari crater in Siberia, the result of a huge impact 35 million years ago, Russian researchers unearthed polycrystalline diamond clusters reaching nearly half an inch across.
Unlike other diamonds, carbonadoes are not found in a crystallized form - they are found in irregular or rounded fragments. Carbonadoes have a hardness of 10 and a specific gravity (density) of 3.1-3.3. Diamonds have a very hard polycrystalline ...
00:22, 11 January 2008 (hist) (diff) N Microcrystalline (New page: Materials consisting of aggregated crystals are termed polycrystalline and if individual crystals can be seen only under magnification, the term microcrystalline may be used.
 See also: Crystalline, Crystal, Stone, Crystals, Rough
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