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Topic: Cubic (crystal system)

Related Topics

Rhombohedral

Crystal system

Triclinic

Cubic

Monoclinic

Orthorhombic

Crystal structure

Bravais lattice

Symmetry group

Crystal

Galena (mineral)

Cube

Sphere packing

	The Isometric (Cubic) Crystal System
		Of the seven crystal systems, the isometric system possesses the highest symmetry.
		Keep in mind that cell parameters do not define the crystal class, but are a consequence of the symmetry elements that define the system.
		In the cubic system there will always be at least one 2, 4, 2bar, or 4bar axis and one 3 or 3bar axis.
	www.iumsc.indiana.edu /morphology/cubic.html (0 words)

	Crystal (mineral) - MSN Encarta
		Crystals are produced whenever a solid is formed gradually from a fluid, whether the formation results from the freezing of a liquid, the deposition of dissolved matter, or the direct condensation of a gas into solid form.
		The thirty-two classes are grouped into six crystal systems, based on the length and position of the crystal axes, imaginary lines passing through the center of the crystal, intersecting the faces, and bearing definite relations to the symmetry of the crystal.
		The six crystal systems are of great importance to mineralogists and gemologists; specification of the system is necessary in the description of any mineral (see Mineralogy).
	encarta.msn.com /encyclopedia_761570052/Crystal_(mineral).html (876 words)

	Intro to Minerals: Crystal Class and System
		(The rhombohedral lattice is a subset of the hexagonal crystal system.)
		Crystals of this system tend to be of prismatic, tabular, or acicular habit.
		It is thus apparent that the characteristic symmetry element of the isometric crystal system is the possession of four 3-fold axes of rotational symmetry, while the characteristic symmetry element of the rhombohedral division of the hexagonal crystal system is the possession of a single 3-fold axis of rotational symmetry.
	dave.ucsc.edu /myrtreia/crystal.html (4278 words)

	Crystalline Structures \| Crystal Lattice \| Crystal System
		The crystal system is a grouping of crystal structures that are categorized according to the axial system used to describe their "lattice".
		A crystal's lattice is a three dimensional network of atoms that are arranged in a symmetrical pattern.
		The Hexagonal crystal system is has four crystallographic axes consisting of three equal horizontal or equatorial (a, b, and d) axes at 120º, and one vertical (c) axis that is perpendicular to the other three.
	www.khulsey.com /jewelry/crystalline_structures.html (753 words)

	The UnMuseum - Crystals
		For example, in the cubic system all crystals have 90 degree angles and the axes are of equal length.
		When crystals are cut, as when they are when being prepared to be used in jewelry, they must be sheered along particular axes, or cleavage planes of the crystal.
		Pure quartz is clear, but when the crystal is formed in the presence of minerals like iron, aluminum, manganese or titanium, atoms from these can substitute for the silicon atoms in the crystal, giving it a tint or color.
	www.unmuseum.org /crystals.htm (1064 words)

	YourGemologist Cubic Zirconia
		Cubic zirconia is sort of an oxymoron...that meaning that it is really a contradiction of terms.
		Mainly because zirconium is not only a metal, but it crystallizes in the tetragonal crystal system in the form of the gemstone called zircon.
		Below are two views of the same cubic zirconia crystal that has been split from the main crystal that formed in the skull melt.
	www.yourgemologist.com /CubicZirconia/cubiczirconia.html (1244 words)

	Copper, Azurite, Malachite, Rhodocrosite, Chrysocolla
		Isometric crystals possess four three-fold axes of symmetry and are measured against three axes of equal length which occur at right angles to one another.
		Aggregates of crystals are frequently botryoidal in habit, having a globular form said to resemble a bunch of grapes.
		Crystals of this system are measured against three vertical axes which intersect one another at 120° angles and one horizontal axis which is perpendicular to the other three.
	dave.ucsc.edu /myrtreia/specimens.html (3023 words)

	Miller Index Notation
		The orientation of a surface or a crystal plane may be defined by considering how the plane (or indeed any parallel plane) intersects the main crystallographic axes of the solid.
		In fact there are a total of 6 faces related by the symmetry elements and equivalent to the (100) surface - any surface belonging to this set of symmetry related surfaces may be denoted by the more general notation {100} where the Miller indices of one of the surfaces is instead enclosed in curly-brackets.
		Final important note : in the cubic system the (hkl) plane and the vector [hkl], defined in the normal fashion with respect to the origin, are normal to one another but this characteristic is unique to the cubic crystal system and does not apply to crystal systems of lower symmetry.
	www.chem.qmul.ac.uk /surfaces/scc/scat1_1b.htm (709 words)

	Diamonds \| American Museum of Natural History
		Using this cubic form and its highly symmetrical arrangement of atoms, diamond crystals can develop in a variety of different shapes known as "crystal habits." The octahedron, or eight-sided shape that we associate with diamonds is its most common crystal habit.
		All of these shapes are manifestations of the cubic crystal system to which the mineral diamond belongs.
		Two exceptions are the flat form called a macle, which is actually a composite crystal, and etched crystals, which have rounded surfaces and, sometimes, elongated shapes.
	www.amnh.org /exhibitions/diamonds/structure.html (308 words)

	III.C. CRYSTALS, SYMMETRY, AND DIFFRACTION
		Crystal lattice: Crystals are composed of groups of atoms repeated at regular intervals in three dimensions with the same orientation.
		Crystal Structure: The mutual arrangement of atoms, molecules or ions that are packed together in a lattice to form a crystal.
		Crystal System: The seven crystal systems, best classified in terms of their symmetry, correspond to the seven fundamental shapes for unit cells consistent with the 14 Bravais lattices.
	em-outreach.ucsd.edu /web-course/Sec-III.C.1-C.5/Sec-III.C.1-C.5.html (3671 words)

	How To Identify Minerals: Crystal Form
		The axes of the crystal, the angles at which the axes intersect, and the degree of symmetry define each system.
		Crystals are usually shaped like blocks, with similar and symmetrical faces.
		The crystal has three axes of symmetry, all at right angles to each other, and all of the same length.
	www.sdnhm.org /kids/minerals/howto-form.html (227 words)

	CrystalDesigner Tutorial
		The window consists of four regions; the crystal system, the space group, the lattice parameters, and the atom positions region.
		The first thing you need to do is to select the crystal system from the popup menu in the document window.
		After choosing the cubic crystal system, enter CaTiO3 crystal structure lattice parameter into the edit box in the lattice parameter region, a = b = c = 380 pm.
	www.crystaldesigner.no /UserGuide/tutorial.html (1805 words)

	[No title]
		A crucible is used inside which the material at the center is melted by radio waves, causing a solid outer crust of oxide to be left on the outer walls.
		Cubic Ziconia Bracelets, Cubic Zirconia from the chillimall')" href="http://click.hotbot.com/director.asp?site=search.lycos.com&partner=&start_group=retriever_topic&id=2&keys=Cubic+Zirconia&target=http%3A%2F%2Fjewelry.chillimall.com%2FCubic_Ziconia_Bracelets.html">jewelry.chillimall.com
		Cubic zirconia is created by applying incredible heat and pressure to the mineral zirconium dioxide, inducing it to crystallize into a cube structure.
	www.lycos.com /info/cubic-zirconia.html (233 words)

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