rhombohedral group

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• Space group — In mathematics and geometry, a space group is a symmetry group, usually for three dimensions, that divides space into discrete repeatable domains. In three dimensions, there are 219 unique types, or counted as 230 if chiral copies are considered… …   Wikipedia

• Some properties of the boron group elements — ▪ Table Some properties of the boron group elements boron aluminum atomic number 5 13 atomic weight 10.811 26.9815 colour of element brown silver white melting point (°C) 2,100–2,200 659.7 boiling point (°C) sublimes 2,550 2,467 density ●   solid …   Universalium

• Some Properties of the Zinc Group Elements, Table — ▪ Table zinc cadmium mercury Atomic number 30 48 80 Atomic weight 65.37 112.41 200.61 Melting point (degrees Celsius) 419.57 321 38.8 Boiling point (degrees Celsius) 907 767 357 Density, solid (grams per cubic centimetre) 7.14 (20 degrees… …   Universalium

• Crystal system — Diamond crystal structure consists of face centered cubic lattice. In crystallography, the terms crystal system, crystal family, and lattice system each refer to one of several classes of space groups, lattices, point groups, or crystals.… …   Wikipedia

• Classification of minerals — This list gives an overview of the classification of minerals (non silicates) and includes mostly IMA recognized minerals and its groupings. This list complements the alphabetical list on List of minerals (complete) and List of minerals. Rocks,… …   Wikipedia

• Crystal structure of boron-rich metal borides — Two single crystals of YB66 (1 cm diameter) grown by floating zone technique using (100) oriented seeds. In the top crystal, the seed (left from the black line) has same diameter as the crystal. In the bottom crystal (sliced), the seed is much… …   Wikipedia

• Dicopper chloride trihydroxide — IUPAC name Dicopper chloride trihydroxide …   Wikipedia

• Crystal structure — In mineralogy and crystallography, crystal structure is a unique arrangement of atoms or molecules in a crystalline liquid or solid. A crystal structure is composed of a pattern, a set of atoms arranged in a particular way, and a lattice… …   Wikipedia

• Calcite — A one inch Calcite Rhomb that shows the Double image refraction property. General Category Carbonate mineral …   Wikipedia

• Cleavage (crystal) — Green fluorite with prominent cleavage. Cleavage, in mineralogy, is the tendency of crystalline materials to split along definite crystallographic structural planes. These planes of relative weakness are a result of the regular locations of atoms …   Wikipedia

• Mercury (element) — gold ← mercury → thallium Cd ↑ Hg ↓ Cn …   Wikipedia