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Topic: Crystal class

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	Intro to Minerals: Crystal Class and System
		For example, crystals of the holomorphic class of the isometric system possess inversion symmetry, three 4-fold axes of rotational symmetry, the characteristic set of four 3-fold axes of rotational symmetry which is indicative of the isometric crystal system, six 2-fold axes of rotational symmetry, and nine different mirror planes.
		In contrast, a crystal which is not a member of the holomorphic class yet still belongs to the isometric system may possess only three 2-fold axes of rotational symmetry and the characteristic four 3-fold axes of rotational symmetry.
		The rhombic pyramidal crystal class is thus a member of the orthorhombic crystal system, the tetragonal pyramidal class is a member of the tetragonal crystal system, and the trigonal and hexagonal pyramidal classes are members of the rhombohedral (trigonal) and hexagonal divisions of the hexagonal crystal system respectively.
	dave.ucsc.edu /myrtreia/crystal.html (4278 words)

	Crystal Growing K-12 Experiments for Lesson Plans & Science Fair Projects
		Which crystal structure the fluid will form depends on the chemistry of the fluid, the conditions under which it is being solidified, and also on the ambient pressure.
		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.
		Twenty of the 32 crystal classes are piezoelectric.
	www.juliantrubin.com /encyclopedia/chemistry/crystal.html (2408 words)

	Crystal Class Measurements (Site not responding. Last check: 2007-11-01)
		The crystal class of a mineral is determined by how the atoms fit together on the atomic level.
		There are six major crystal classes, each with a large subset of crystal forms.
		Crystal classes are defined by the relationships of the axes and angles shown above.
	www.museums.udel.edu /mineral/mineral_site/education/CrystalClasses/measurements.html (106 words)

	Class Definition for Class 62 - REFRIGERATION
		Class 95 takes gas separation of the type noted above including cooling of the sorbent or cooling of the fluid mixture, but not including evaporative cooling after sorption of the type noted in (c) below.
		Class 95 also takes expansion through an orifice of a liquid and gas entrained therein where the gas is evolved through the lowering of the pressure and the cooling effect which inherently results from such pressure reduction is
		Class 62 provides for the combination of plastic material shaping or reshaping apparatus combined with refrigeration apparatus for the material shaped.
	www.uspto.gov /go/classification/uspc062/defs062.htm (3668 words)

	External Symmetry of Crystals, 32 Crystal Classes (Site not responding. Last check: 2007-11-01)
		For this crystal class, the convention is to write mm2 rather than 2mm (I'm not sure why).
		Note that you are not expected to memorize the crystal classes, their names, or the symmetry associated with each class.
		In the prismatic class, these prisms consist of 4 identical faces, 2 of which are shown in the diagram on the front of the crystal.
	www.tulane.edu /~sanelson/eens211/32crystalclass.htm (2006 words)

	Class 117: SINGLE-CRYSTAL, ORIENTED-CRYSTAL, AND EPITAXY GROWTH PROCESSES; NON-COATING APPARATUS THEREFOR / U.S. Patent ...
		Class 148 provides for single-crystal* growing when combined with a subsequent heat treatment (which herein includes controlled cooling) step when the purpose of the heat treatment (or controlled cooling) is to modify the internal physical structure or chemical property of a metal, alloy, or intermetallic material.
		Class 117 takes apparatus which include a means of single-crystal* growth combined with (a) broad or nominally claimed metal shaping means or (b) means for assembling the precursors* of forming the single-crystal*.
		Class 117 takes (a) single-crystal* growing simultaneous with shaping (except molding of non-semiconductor metal* which is placed in Class 164, subclasses 122.1+) or (b) single-crystal* forming of all types of materials, including organic or inorganic (non-metal* or metal*), combined with a broad or nominally recited shaping or treating step.
	www.uspto.gov /go/taf/def/117.htm (12336 words)

	Outer Form of Crystals
		When we consider an initial crystal face on a crystal that possesses this axis, then the face generated by subjecting this initial face to the workings of this axis must also be present on that crystal.
		Because these remaining Crystal Classes (of the Isometric System) are all less symmetric than the Cubic Hexakisoctahedral Class, and because we can order these Classes according to a decreasing symmetry, we can generate the shapes of crystals of these less symmetrical Classes by starting, not with the basic faces, but with the basic Forms.
		The crystal is replaced by a set of face perpendiculars, by drawing perpendiculars originated from some point in the crystal to all the faces (or their extentions) of the crystal.
	home.hetnet.nl /~heackel/crystal_classes.html (9812 words)

	Crystal structure - Wikipedia, the free encyclopedia
		The crystal structure of a material is often discussed in terms of its unit cell.
		The crystal systems are a grouping of crystal structures according to the axial system used to describe their lattice.
		Twenty of the 32 crystal classes are so-called piezoelectric, and crystals belonging to one of these classes (point groups) display piezoelectricity.
	en.wikipedia.org /wiki/Crystal_structure (1142 words)

	The Mind's Eye: Crystal Master Prestige Class (v.3.5)
		This essentially means that she adds the level of crystal master to the level of whatever psionic manifesting class the character has, then determines power points per day, powers known, and manifester level accordingly.
		If a character had more than one psionic class before she became a crystal master, she must decide to which class she adds the new level of crystal master for the purpose of determining power points per day, powers known, and manifester level.
		The crystal master must maintain psionic focus to use this ability and her psicrystal also must be in physical contact with her body to gain any benefit.
	www.wizards.com /default.asp?x=dnd/psm/20040625d (2163 words)

	ARHA: Reiki, SSR, Crystal, Mediumship, Psychic Development Classes
		During the class, you will be able to refer to the Reiki II manual that we have produced specifically for this course.
		During the class, you will be able to refer to the Crystal Discovery manual that we have produced specifically for this course.
		During the class, you will be able to refer to the SSR Facets I and II manual that we have produced specifically for this course.
	www.amethysthealing.com /classes.php (889 words)

	Crystal system - Wikipedia, the free encyclopedia
		A crystal system is a category of space groups, which characterize symmetry of structures in three dimensions with translational symmetry in three directions, having a discrete symmetry group.
		A major application is in crystallography, to categorize crystals, but by itself the topic is one of 3D Euclidean geometry.
		The crystal structures of biological molecules (such as protein structures) can only occur in the 11 enantiomorphic point groups, as biological molecules are invariably chiral.
	en.wikipedia.org /wiki/Crystal_system (689 words)

	Bob's Rock Shop: Introduction to Crystallography and Mineral Crystal Systems
		All the crystal faces present are the expression of the repetition of a single form having the Miller indices of {111} about the three crystallographic axes (remember those from the first article?).
		Each face on a natural crystal (octahedral galena or fluorite are examples), when rotated to the position of the (111) face in the drawing, would have the same shape and orientation of striations, growth pits or stair steps, and etch pits, if present.
		The latter notation tells us how to orient the crystal, in each specific crystal class, to recognize which axis (a, b, or c) is designated as having the highest symmetry.
	www.rockhounds.com /rockshop/xtal/part2.html (1223 words)

	Crystal E-Class
		This is a two weeks course on crystals by Professional crystal master - atan, in this course one will learn different techniques how to clean,choose and energize crystals.
		Like how clean is your crystal after one cleaned it or how much one had really energized the crystal.
		At the end of the course atan will teach and advise how to use the clean and energized crystals for protection,good wealth and good health for man and woman of the house.
	www.dhealing.com /c_crystalcourse.html (132 words)

	Crystal Lab
		This problem is likely to occur with all faces in all crystal classes.
		Crystal Shape Laboratory produces a pov file which can be moved by cut and paste into POV-RAY and be rendered immidiately.
		For example you can order the crystal to be made out of glass of any color or it can have a polished chrome surface.
	www.crystalgrowing.com /crystal-lab/crystal-lab.htm (1237 words)

	reiki class, reiki training, crystal healing, healing drum, drumming, reiki master, reiki teacher, reiki symbol
		This attunement is designed to assist practitioners in developing the ability to align with the specific healing properties of crystals and gemstones.
		Reiki is a form of spiritual healing energy which is guided by the infinite intelligence of the universe, which we have come to know as the heart and mind of God.
		A requirement when working with the energy of crystals is for the practitioner to have an understanding of how to be a clear an open channel for spiritual healing energy to flow through.
	www.reikiclasses.com /crystalenergy.htm (548 words)

	Online Course: Crystal Healing - Certificate and CEUs
		The course is long and requires a lot of reading and exercises, but it you have been wanting to learn crystal healing and have put it off because of the high cost than you will find that this class is well worth it.
		Crystal Healing taught by Darla Meng is a course striving to give students a larger understanding of all the different uses of crystals and stones and an understanding of how different stones work with one another to heal certain ailments.
		The class examines both the teaching and the demonstration of healing as it was practiced by p...
	www.universalclass.com /i/crn/3621.htm (2586 words)

	New Page (Site not responding. Last check: 2007-11-01)
		As requested, this monthly class allows you to continue to learn, practice and work with crystal alignments, gemstone familiarity and identification, spiritual healing practice and more.
		The purpose of this course is to provide an in depth study, experience and understanding of spiritual healing with crystals, colors and the chakras.
		This class will teach you about clear quartz crystals, the chakras, color therapy, reading and balancing energy of the body, laying on of stones, clearing negative energy, Aura Soma, smudging and aromatherapy
	www.thecrystalgarden.com /SpecialEvents/crystalcertification.htm (295 words)

	Crystal Reports Training (Site not responding. Last check: 2007-11-01)
		CrystalUser.com is the largest provider of Crystal Reports Training in the US with regularly scheduled classes nation wide.
		In addition to the basic introduction and advanced courses on Crystal Reports, CrystalUser.com also offers a series of in depth workshops on Crystal Reports tailored for the average user of Crystal Reports.
		Students who cancel their enrollment less than 16 days prior to the start date will be charged 100% of the workshop fee and you may be permitted to reschedule into a class of equal value.
	www.crystaluser.com /training.htm (422 words)

	Crystal growing
		Crystals shoot from these smaller volumes of liquid quite quickly and can grow to a length of a few millimetres by the time the big jars are ready to take them.
		Notice that the crystal on the left has a large intergrowth emerging on its (100) face, and that the (110) and (-110) faces of the left-hand crystal are unequally developed, masking the rotational symmetry: the (1 -1 0) and (-1 -1 0) faces are equally developed.
		Potassium hydrogen tartrate crystallises in the orthorhombic bisphenoidal class (222) with unit cell-edge ratios of a:b:c = 0.7116 : 1 : 0.7292.
	www.homepages.ucl.ac.uk /~ucfbanf/crystal.htm (4424 words)

	Hexagonal Crystal System V
		All in all the Class contains seven rotation axes of which six 2-fold axes lie in the equatorial plane and one 6-fold axis is oriented perpendicular to that plane.
		The Forms of this Class will be found when we subject the holohedric Forms one by one to the trapezohedric hemihedric, which means that we suppress all mirror planes (simultaneously).
		The stereographic projection of the symmetry elements of this Class is given in Figure 13.
	www.geocities.com /jaap_bax/hexagonal_5.html (2611 words)

	Crystal Wheel Class
		They can be worn alone on a chain or can be strung together with several crystal wheels.
		This ring can be used as one half of a toggle clasp using a peyote tube bead for the other half or can be used in a lariat style necklace.
		One crystal wheel will be completed in class.
	www.alcy.com /Default.aspx?tabid=65 (109 words)

	Training Class: Advanced Crystal Ball for Oil & Gas
		Attendees should have a good working knowledge of Excel, however, experience with Crystal Ball is not a prerequisite, as beginning concepts and techniques are covered (or reviewed depending on the student's experience) in the first 1/2 day of the course.
		Advanced Crystal Ball for Oil and Gas is a group live software training course worth sixteen CPE credit hours (a credit hour is 50 minutes of training per hour).
		Decisioneering, Inc. is registered with the National Association of State Boards of Accountancy (NASBA) as a sponsor of continuing professional education on the National Registry of CPE Sponsors.
	www.crystalball.com /training/training-oilgas.html (853 words)

	Hexagonal Crystal System IX
		This Class is also called Rhombohedric-hemimorphic Class, because the number of faces of the Forms of this Class is half that of the Rhombohedric Hemihedric Division.
		The result is that faces at the top of a crystal belong to different Forms of this Class than those at the underside of the crystal.
		The Forms of this Class will be found when we subject the Forms of the Trigonal Hemihedric Division (described in Part Eight) to hemimorphy, which means that we suppress their equatorial mirror plane.
	home.hetnet.nl /~heackel/hexagonal_9.html (1614 words)

	Crystal Group
		Crystal Group has a number of CPU cards with different capabilities and requirements.
		Unlike all other Crystal CPU cards, it has a pair of small, shiny, aluminum heat sinks loacted near the CPU.
		It is the only Crystal Pentium class CPU card that uses DIMMs instead of SIMMs.
	www.crystalpc.com /support_identifyyoursbc.asp (510 words)

	CRYSTALLOGRAPHY
		-a crystal form is a group of faces, all of which have the same relation to the functions of
		crystal symmetry--it is possible to determine the crystal class based on the com-
		crystal class names are based on the most outstanding form possible in that class
	courses.missouristate.edu /EMantei/mineralogy/crystallography.html (2585 words)

	The Isometric (Cubic) Crystal System
		Keep in mind that cell parameters do not define the crystal class, but are a consequence of the symmetry elements that define the system.
		The Octahedron {111} consists of eight equilateral triangular faces, each of which is has a corner on each of the three axes of the cubic cell.
		Crystals usually have several forms, and can look remarkably different, depending on how pronounced each form is. The applet to the left and following applets show the progression from Cube to Octahedron.
	www.iumsc.indiana.edu /morphology/cubic.html (446 words)

	Isometric Crystal System
		In deriving this Class and its Forms we shall repeat some things already expounded in the previous Essay on the Morphology of Crystals, but there it was meant as a specific example serving in a more general context.
		To derive this Form we tilt the basic face of Figure 1 in the most general way, which means that we turn it to the effect that the cut-off pieces of the Y-axis and the Z-axis increase, but to an unequal extent, while the cut-off piece of the X-axis remains the same.
		The Forms of this hemihedric Symmetry Class are derived from the ones of the Holohedric Division (the Hexakisoctahedral Crystal Class) by suppressing the six secondary mirror planes.
	metafysica.nl /isometric.html (3887 words)

	:: Class Information :: (Site not responding. Last check: 2007-11-01)
		Due to limited seating all classes are pre-paid.
		If you need to cancel, please be aware that all classes require a 3 day cancellation notice.
		If you cancel 3 days or less (see exception) from the start of the class* you will forfeit 50% of monies paid toward the class fee and the remaining 50% will be issued as a store credit to be used towards another Crystal Creations Class.
	www.crystalcreationsbeadinstitute.com /classdetail.php?classId=98 (359 words)

	City of Crystal Lake
		All classes are developed and sanctioned by the American Heart Association.
		All classes are taught at the Crystal Lake Fire Rescue Department, Station 1, located in the Crystal Lake Municipal Complex.
		If the class* size minimum requirement is not met one week prior to the date of class, the Crystal Lake Fire Rescue Department reserves the right to cancel the class.
	www.crystallake.org /cpr.htm (454 words)

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