Most diamond crystals are in the form of this solid figure having 8 faces
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Dodecahedron - Wikipedia  In geometry, a dodecahedron is any polyhedron with twelve flat faces. The most familiar dodecahedron is the regular dodecahedron, which is a Platonic solid ... The pyritohedron is an irregular pentagonal dodecahedron, having the same ... In crystallography, two important dodecahedra can occur as crystal forms in some...
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Crystal - Wikipedia  A crystal or crystalline solid is a solid material whose constituents are arranged in a highly ... Examples of polycrystals include most metals, rocks, ceramics, and ice. ... A crystal is a solid where the atoms form a periodic arrangement. ... Crystals are commonly recognized by their shape, consisting of flat faces with sharp...
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* Octahedron (Jewelry) - Definition,meaning - Online Encyclopedia  OCTAHEDRON-- The octahedron is a form composed of 8 equilateral ... These triangle-shaped faces intersect all 3 crystallographic axes at the same ... Most common form of rough diamonds. ... A solid figure having eight sides or faces.
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Crystal Shapes Complete Correspondance Chart  Earth DNA  Jan 29, 2012 ... 8-Faceted Crystal A rare crystal with eight faces (facets) instead of the normal ... Arkimer Diamond Crystal .... This phenomenon is most effective when the stone is cut into a ... A rare form of Quartz that appears as one crystal engulfing or ... Crystal, A solid mass of mineral, having a regular geometric shape...
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Most diamond crystals are in the form of this solid figure having 8 ...  Jul 22, 2016 ... Most diamond crystals are in the form of this solid figure having 8 faces # Quiz # Question. video. 0:28 0 likes, 0 dislikes. No views.
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Symmetry in Crystallography Notes  Feb 7, 2016 ... In crystallography, most types of symmetry can be described in terms of an ... The apparent movement is called the symmetry operation. ... Crystals are defined as solids that have an atomic structure with long-range, 3-dimensional order. ... There are many choices of repeating blocks in any given lattice.
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Selection: decahedra - Paper Models of Polyhedra  Decahedron Number of faces: 10. Number of edges: 20. Number of vertices: 12. enneagonal pyramid paper model enneagonal pyramid...
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Decahedron | Define Decahedron at Dictionary.com  Decahedron definition, a solid figure having ten faces. See more.
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Quartz - YodelOut!  (Rock-Crystal, Amethyst, Citrine, Cairngorm, Cat's Eye, Tiger's-Eye). ALTHOUGH the commonest and, in its natural form, the most easily ... transparent stones that are, when small, known in many localities as diamonds. .... A silicified crocidolite, in which the blue colour is retained, comes also from Salzburg, and is known as...
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Gemology Online: Dictionary Diamond Terms  Though some blemishes are inherent to the original rough diamond, most are the ... (on round diamonds and most fancy cuts) or concentric rows of facets reaching from the table ... depth-the actual depth in millimeters (under "measurements" at the top of the report) ... A round brilliant has 58 facets (or 57 if there is no culet).
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Diamond Glossary - Graham Jewelry  Antique and other old or heavily used diamonds can have abrasions. ... The standard round brilliant cut consists of a total of 58 facets which covers 1 table, 8 bezel ..... A term used for flat or plane surface, particularly in a rough diamond crystal.
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GLOSSARY OF TYPICAL JEWELRY TERMS - Pennachio Jewelers  A square barion cut diamond has 61 facets, excluding the culet. ... Bezel -- With a bezel setting, a rim holds the stone and completely surrounds the gem. It is the upper portion above the girdle of a cut stone. ... for wedding and anniversary bands, a channel setting will set the stones right next to each other with no metal...
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Allotropes - Chemistry Encyclopedia - structure, reaction, elements ...  The diamond lattice (Figure 3a) contains tetrahedral carbon atoms in an infinite ... There are two allotropic elements in Group 15, phosphorus and arsenic . .... Sulfur forms an extensive series of generally yellow crystalline allotropes, S n...
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Brilliant (diamond cut) - Wikipedia  A brilliant is a diamond or other gemstone cut in a particular form with numerous facets so as to ... The modern round brilliant consists of 58 facets (or 57 if the culet is ... Because every facet has the potential to change a light ray's plane of travel, every facet ... Several groups have developed diamond cut grading standards.
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Mohs Scale of Hardness - Mineralogical Society of America  This scale is a chart of relative hardness of the various minerals (1 - softest to 10 - hardest). ... Diamonds (10) also show a variation in hardness (the octahedral faces are harder than the cube faces). ... One can also get a relative feel for the hardness difference between two minerals. ... Corundum, 9, variety ruby, India 6 cm.
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Encyclopedia Smithsonian: Hope Diamond  Its color was described by Tavernier as a "beautiful violet." Tavernier sold the diamond to King Louis XIV of France in 1668 with 14 other large diamonds and several smaller ones. In 1673 the stone was recut by Sieur Pitau, the court jeweler, resulting in a 67 1/8-carat stone.
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Chemistry: The Central Science, Chapter 11, Section 7  The repeating unit of a solid, the crystalline "brick," is known as the unit cell. ... the smallest one that shows clearly the symmetry characteristic of the entire pattern. ... Figure 11.31 The three types of unit cells found in cubic lattices. ... Figure 11.34 Portion of the crystal lattice of NaCl, illustrating two ways of defining its unit cell.
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The Kimberley Octahedral diamond is the largest naturally formed ...  Today it is the 14th largest gem-quality rough diamond ever discovered in the world. ... Type Ib, but these diamonds are very scarce constituting only about 0.1 % of all ... of South Africa, and was a large naturally formed yellow octahedral crystal. ... De Beer between 1867 and 1871, two diamond mines were dug on the farm,...
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Dodecahedra - George W. Hart  for every letter of its name. ... are a great many 12-sided polyhedra, all of which could be called dodecahedra. ... to the regular dodecahedron (as it has twelve identical 5-sided faces, meeting ... Each pentagon has mirror symmetry and the solid as a whole has tetrahedral ... It is one of the eight regular convex deltathedra.
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Dodecahedron - Wikipedia  In geometry, a dodecahedron is any polyhedron with twelve flat faces. The most familiar ... There are a large number of other dodecahedra. ... Like the regular dodecahedron, it has twelve identical pentagonal faces, with three meeting in ... Its name comes from one of the two common crystal habits shown by pyrite, the other...
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the famous hope diamond at the smithsonian national museum of ...  Feb 11, 2016 ... the famous hope diamond at the smithsonian national museum of natural history weighs 45.52 carats. Diamond is a crystallized form of carbon.