
	Where results make sense

Topic: Cleavage (crystal)

	Cleavage (crystal) - Wikipedia, the free encyclopedia
		Basal cleavage: cleavage parallel to the base of a crystal, or to the plane of the lateral axes.
		Octahedral, Dodecahedral, or Rhombohedral cleavage: cleavage parallel to the faces of an octahedron, dodecahedron, or rhombohedron (respectively).
		Prismatic cleavage, cleavage parallel to a vertical Prism.
	en.wikipedia.org /wiki/Cleavage_(crystal) (295 words)

	Crystal structure - Wikipedia, the free encyclopedia
		A crystal structure is composed of a unit cell, a set of atoms arranged in a particular way; which is periodically repeated in three dimensions on a lattice.
		The crystal systems are a grouping of crystal structures according to the axial system used to describe their lattice.
		The space group of the crystal structure is composed of the translational symmetry operations in addition to the operations of the point group.
	en.wikipedia.org /wiki/Crystal_structure (1142 words)

	Sodium Chloride Crystal Cleavage
		A knife is placed on a large sodium chloride crystal parallel to a cleavage plane.
		When one of these crystals is tapped with the knife at an angle, it shatters, breaking along a cleavage plane rather than parallel to the knife blade.
		Based on this animation, describe in words why the crystal of sodium chloride shattered when the knife blade was placed at a 45-degree angle to a face and tapped with a hammer.
	jchemed.chem.wisc.edu /JCESoft/CCA/CCA2/MAIN/CLEAVE/CD2R1.HTM (381 words)

	Mineral Gallery - the property of CLEAVAGE (Site not responding. Last check: 2007-11-02)
		Cleavage is said to be basal when it occurs perpendicular to the major axis of the mineral and prismatic when it occurs parallel to the major axis.
		Multiple cleavages that produce geometric polygons are referred to using the name of the geometric polygon, such as octahedral cleavage in the mineral fluorite, cubic cleavage in the mineral halite or rhombohedral cleavage in calcite (pictured).
		To identify cleavage in a mineral remember that it is always parallel to a possible crystal face, it is reproducible over and over again and that it may be seen as internal reflection planes.
	mineral.galleries.com /minerals/cleavage.htm (682 words)

	Physical Properties
		A crystal's habit is, in part, related to the internal structure of the mineral, but also the conditions of crystal growth.
		The cleavage quality and the number of cleavage directions is related to the internal arrangement of atoms in the crystalline structure and the type chemical bonding between the atoms in the mineral.
		The nature of the interactions are highly dependent upon (1) the number of d electrons, (2) the coordination number or the number of anions surrounding the cation, (3) the distance between the cation and anions or distortion of the polyhedron and (4) the orienation of the particular d orbital to coordinating polyhdedron.
	www.gly.uga.edu /schroeder/geol3010/physical.html (1116 words)

	[Ganoksin] Jewelry Making - Introductory Gemmology - Definitions Concerning Physical Properties of Gemstones
		A crystal may be cleaved in directions related to the external form or to a possible crystal form for the mineral.
		Cleavage: The is the tendency of a crystallized mineral to break in definite directions related to the crystal structure producing relatively smooth cleavage break surfaces.
		Cleavage is described by the crystal face to which it is parallel; diamond has octahedral cleavage, topaz has basal (parallel to the base of the topaz crystal prism).
	www.ganoksin.com /borisat/nenam/physical.htm (1261 words)

	Cleavage - Wikipedia, the free encyclopedia
		Cleavage in general refers to a division or separation of form.
		Cleavage (embryo), in embryology, is the division of cells in the early embryo
		Cleavage (crystal), in mineralogy and materials science, is a process of splitting a single crystal
	en.wikipedia.org /wiki/Cleavage (171 words)

	Soil Micromorphology Glossary (Site not responding. Last check: 2007-11-02)
		Crystals may have cleavage in one direction (mica), two directions (pyroxenes and amphiboles), rhombohedral cleavage in three directions (calcite), or even four (fluorite) or six (garnet) directions.
		A crystal is a solid composed of atoms arranged in an orderly repetitive array.
		The outward morphology and symmetry (crystal structure) are a reflection of the inner ordered arrangement of atoms, the nature of their bonding, and their relationship to each other.
	www.soils.org /divs/s9/micromorph/gloss2.html (2272 words)

	Encyclopedia :: encyclopedia : Mineralogy (Site not responding. Last check: 2007-11-02)
		Mineralogy is an earth science focussed around the chemistry, crystal structure, and physical (including optical) properties of minerals.
		It, however, retains a focus on the crystal structures commonly encountered in rock-forming minerals (such as the perovskites, clays and framework silicates).
		To this end, in their focus on the connection between atomic-scale phenomena and macroscopic properties, the mineral sciences (as they are now commonly known) display perhaps more of an overlap with materials science than any other discipline.
	www.hallencyclopedia.com /Mineralogy (270 words)

	Physical Characteristics of Minerals
		Cleavage is the result of weaker bond strengths or greater lattice spacing across the plane in question than in other directions within the crystal.
		Both the positioning of crystal faces in a mineral and the property of cleavage are derived from the crystalline structure of the species.
		In such a sample the crystals are too tiny to be observable by the eye and are interlocked and mingled; the specimen lacks visible crystals.
	dave.ucsc.edu /myrtreia/physical_character.html (5718 words)

	Crystals and Cleavage
		Crystals have a repeating pattern of molecules or atoms, and this is what makes crystals different from other types of matter.
		This is a cleavage plane: A weakness in one directly that occurs throughout the mineral because of its internal crystal structure.
		Cleavage planes are always parallel to a crystal face or a potential crystal face in a crystal.
	borntoexplore.org /ryan/crystals.htm (598 words)

	Physical Properties of Minerals
		Crystals often contain planes of atoms along which the bonding between the atoms is weaker than along other planes.
		Cleavage is usually induced in the mineral when it is extracted from the rock when it is found, and can usually be seen as planes running through the mineral.
		Cleavage can also be described by general forms names, for example if the mineral breaks into rectangular shaped pieces it is said to have cubic cleavage, if it breaks into prismatic shapes, it is said to have prismatic cleavage, or if it breaks along basal pinacoids it is said to have pinacoidal cleavage.
	folk.ntnu.no /krill/mineralogee/9.htm (1934 words)

	Methods Used in Identifying Minerals, Kentucky Geological Survey
		The physical properties of minerals are determined by the atomic structure and crystal chemistry of the minerals.
		Crystals developed under favorable conditions often exhibit characteristic geometric forms (which are outward expressions of the internal arrangements of atoms), crystal class, and cleavage.
		Crystals are divided into six major classes based on their geometric form: isometric, tetragonal, hexagonal, orthorhombic, monoclinic, and triclinic.
	www.uky.edu /KGS/rocksmn/methods.htm (865 words)

	Mineral Reference (Site not responding. Last check: 2007-11-02)
		Common gypsum is found as prismatic, curved, or twisting monoclinic crystals of vitreous luster and as earthy, foliated, or granular masses; alabaster as fine grained masses; selenite as colorless, transparent crystals or foliated masses; and satin spar as pearly, fibrous masses.
		Crystal or stone size: small long crystals Comments: The lead arsenate mineral mimetite is a minor ore of lead, occurring in the oxidation zone of lead veins.
		Rutile forms prismatic or needlelike crystals (tetragonal system), most commonly red-brown in color, streak is pale brown, luster is adamantine to metallic, Widespread in small amounts, rutile occurs in intermediate basic igneous rocks as a high-temperature accessory mineral, in gneiss and schist, and in high-temperature veins and pegmatite dikes.
	socrates.berkeley.edu /~eps2/wisc/glossary2.html (7652 words)

	GG 101 Lab "Minerals: Cleavage"
		Although cleavage can be difficult to identify, the trained eye learns to recognize it by the way light is reflected from the broken surface of the crystal.
		Cleavage Surface: Since the apparently irregular surface is really made of flat, parallel surfaces, light rays are reflected in the same direction, so the surface looks shiny like a mirror, and gives a 'flash' when turned in the direction that catches the light in just the right way.
		This is an mpg movie that shows the two direction of cleavage in speciman A. Watch for the slight 'flash' as the crystal is rotated first in one direction, the moved to show the surface shown in the above photos.
	honolulu.hawaii.edu /distance/geolab/cleavage.html (811 words)

	..::Crystal Healing Information::.. (Site not responding. Last check: 2007-11-02)
		Cleavage is the property of a mineral to break along a definite plane or planes.
		The geometric pattern of the crystal faces reflects the internal atomic arrangement of the crystal structure.
		Minerals (and therefore crystals) are found in the rocks forming the upper accessible levels of the earth’s crust.
	www.crystalbalance.com /CrystalHealingInfo.asp (2028 words)

	Analyzing Mineral Shapes
		The crystal shape of a mineral may not be helpful in identifying that mineral in a rock.
		Cleavage is the tendency of a mineral crystal to split in definite directions (when a force is applied) producing more or less smooth surfaces.
		Cleavage is caused by weaknesses in the orderly placement of the atoms within a crystal.
	www.msnucleus.org /membership/html/k-6/rc/minerals/4/rcm4_5a.html (421 words)

	Crystal lab
		When crystals of alum and potassium ferricyanide form on the bottom or sides of containers, they are sometimes distorted because the growth of the crystal is restricted.
		Tie the opposite end of each seed crystal thread around one of the copper wires and adjust the length of the thread such that the seed crystal will be suspended as close to the center of the solution as possible (Figure 4).
		The macroscopic shapes of the crystals you have grown are related to the repeating pattern of atoms, and also on the growth rate of each of the crystal faces.
	www.chem.wisc.edu /~newtrad/CurrRef/BDGTopic/lab/Crystlab.html (5164 words)

	Cleavage (Site not responding. Last check: 2007-11-02)
		A hundred cleavage surfaces parallel to one another all define a single direction of cleavage, because all of them are parallel to the same zone of bond weakness.
		It is the number of directions of cleavage that we record, along with the angles between them.
		It may be difficult for the beginner to distinguish between cleavage and crystal faces.
	geology.csupomona.edu /alert/mineral/cleavage.htm (358 words)

	All You Really Need to Know about Minerals - GEOLOGY 50
		Cleavage intersects at angles of 55° and 125°.
		Perfect calcite crystals (which you'll see in lab) form prisms with 6 (or a multiple of 6) sides and a complex arrangement of faces coming together to a point at the end.
		Cleavage planes are flat surfaces which reflect light sort of like many tiny mirrors at slightly different elevations.
	www.lib.berkeley.edu /EART/reserve/geol50.html (3291 words)

	ROCK CRYSTAL, the colorless variety of quartz
		Rock crystal lacks the fire, color (of course) and the rarity to be ranked as a fine precious gemstone.
		None-the-less, rock crystal is in wide use as a gemstone due to its beauty, affordability, availability and ease of cutting.
		While rock crystal is common it is hard to find large crystals of quartz with the clarity and size required for crystal balls that most of us associate with fortune tellers.Rock crystal is used for many ornamental carvings from spheres (crystal balls) to pyramids to obelisks to figurines to eggs to bowls to wands.
	mineral.galleries.com /minerals/gemstone/rock_cry/rock_cry.htm (484 words)

	Crystal structure of a wild-type Cre recombinase-loxP synapse reveals a novel spacer conformation suggesting an ... (Site not responding. Last check: 2007-11-02)
		Crystal structure of a wild-type Cre recombinase-loxP synapse reveals a novel spacer conformation suggesting an alternative mechanism for DNA cleavage activation -- Ennifar et al.
		Crystals were obtained at 20°C with the hanging drop method.
		Cleavage-competent subunits before cleavage (in yellow) and in the 3'-phosphotyrosine covalent intermediate (in orange) are superimposed.
	nar.oxfordjournals.org /cgi/content/full/31/18/5449 (6018 words)

	Mineral ID_Key
		Cleavage refers to the way some minerals break along certain lines of weakness in their structure.
		Cleavages are also described in terms of their quality: How smoothly and easily the mineral breaks.
		By-and-large, cleavages at 90 degrees to one another indicate a cubic form, cleavages at 120 and 60 degrees in the same sample indicate a rhombohedral form, and cleavages at acute to obtuse angles over long surfaces indicate a prismatic form — such as in feldspars.
	www.rockhounds.com /rockshop/mineral_id (8521 words)

	Minerals
		The three dimensional array of this pattern is the crystal structure of the mineral.
		Therefore, the shapes of crystals are dictated at a fundamental level by the way individual small mineral units are linked and stacked.
		Cleavage is the regular, systematic breakage of a mineral along predictable planes.
	www.geol.umd.edu /~tomascak/solar/0605t.htm (1518 words)

	[No title]
		A fibrous habit is a bundle of parallel needle-like crystals.
		A massive habit indicates that there are little to no crystal faces visible, and may refer to a single crystal or group of crystals.
		Cleavage is the tendency to split or break parallel to atomic planes, forming planar surfaces.
	www.geo.arizona.edu /geo3xx/geo306/lab/1.doc (2041 words)

	Crystal orientation by cleavage plane reflected laser beam
		An apparatus is described for the orientation and transfer of single crystals which have well-defined cleavage planes.
		It is based upon the reflection of a 6328 AA He-Ne laser beam from the cleavage planes.
		Orientation and subsequent transfer of a GaAs crystal to a wafering machine can be done with a cumulative error of less than 0.15 degrees.
	stacks.iop.org /0022-3735/5/975 (206 words)

	Crystal structures of a meta-cleavage product hydrolase from Pseudomonas fluorescens IP01 (CumD) complexed with ... (Site not responding. Last check: 2007-11-02)
		The crystal structures of the inactive S103A mutant of the CumD
		The crystal structure of BphD from Rhodococcus sp.
		crystals were grown by the same method, with a reservoir solution
	www.proteinscience.org /cgi/content/full/11/9/2184 (4937 words)

	Geology for Civil Engineers - V. Bodycomb - Concordia U.
		We will not concern ourselves with crystal form in this course because it is not common to see well-developed crystal faces for minerals found in the rocks you are most likely to encounter as a civil engineer.
		Cleavage describes how a crystal breaks when subject to stress on a particular plane.
		Amphibole and pyroxene minerals can be distinguished by their cleavages because their internal arrangement is different and results in 2 cleavages at 90 for pyroxene, but at (approximately) 120 and 60 angles for amphibole.
	www.eps.mcgill.ca /~venetia/civi231/minerals.html (1008 words)

	cleavage - Wiktionary
		Early registration for Wikimania 2006 is open until July 9.
		The hollow or separation between a woman's breasts, especially as revealed by a low neckline
		The act of cleaving or the state of being cleft
	en.wiktionary.org /wiki/cleavage (178 words)

Try your search on: Qwika (all wikis)