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Topic: Trapezohedron

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	Trapezohedron - Wikipedia, the free encyclopedia
		The n-gonal trapezohedron or deltohedron is the dual polyhedron of a regular n-gonal antiprism.
		The name trapezohedron is misleading as the faces are not trapezoids, but the alternative deltohedron is sometimes confused with the unrelated term deltahedron.
		In texts describing the crystal habits of minerals, the word trapezohedron is often used to refer to the polyhedron properly known as a deltoidal icositetrahedron.
	en.wikipedia.org /wiki/Trapezohedron (480 words)

	The Haunter of the Dark - Wikipedia, the free encyclopedia
		The Shining Trapezohedron was discovered in Egyptian ruins, in a box of alien construction, by Professor Enoch Bowen before he returned to Providence, Rhode Island in 1844.
		Described as a "crazily angled stone", it is unlikely to be a true trapezohedron because of the Old Ones' penchant for bizarre non-Euclidean angles.
		After the death of Robert Blake, who came to grief after discovering the Shining Trapezohedron and deciphering texts about it from ancient evil cults, the artifact was removed from the fl windowless temple where it was found and thrown into the deepest channel of Narragansett Bay.
	en.wikipedia.org /wiki/Shining_Trapezohedron (826 words)

	Antiprism - Wikipedia, the free encyclopedia
		Pentagonal antiprism - 10 triangles, 2 pentagons - dual pentagonal trapezohedron
		Octagonal antiprism - 16 triangles, 2 octagons - dual octagonal trapezohedron
		Decagonal antiprism - 20 triangles, 2 decagons - dual decagonal trapezohedron
	en.wikipedia.org /wiki/Antiprism (520 words)

	CRYSTAL HABIT
		This is different from the effect created in the trapezohedron in that these faces leave the original edges of the octahedron in place and use them as their base for their squashed triangular shapes.
		The trapezohedron is a general term for two crystal forms differentiated by the symmetry of the prominent axes.
		The mineral phosgenite is sometimes terminated with the rare tetragonal trapezohedron.
	mineral.galleries.com /minerals/crystal.htm (2462 words)

	Melanite \| Mineralium.com - Fine Mineral Specimens
		Jet-fl mixed crystals of dodecahedron and trapezohedron with vitreous luster, which measure up to 25 mm across and are grown on a reddish grey matrix.
		Jet-fl mixed crystals of dodecahedron and trapezohedron with vitreous luster, which measure up to 16 mm across and are grown on a reddish grey matrix.
		Jet-fl mixed crystals of dodecahedron and trapezohedron with vitreous luster, which measure up to 15 mm across and are grown on a reddish grey matrix.
	www.mineralium.com /index.php?lang=ENG&list=MEL (701 words)

	trapezohedron - definition by dict.die.net
		trapezohedron n : a polyhedron whose faces are trapeziums
		Tetragonal trisoctahedron, a trisoctahedron each face of which is a quadrilateral; called also trapezohedron and icositetrahedron.
		Trigonal trisoctahedron, a trisoctahedron each face of which is an isosceles triangle.
	dict.die.net /trapezohedron (97 words)

	Pyrite
		The octahedron, cube, and pyritohedron are the principal forms, and each occurs both alone and in combination with each or both of the others in balanced development and with all intermediate degrees.
		Combinations of the octahedron and the trapezohedrons, the latter forms being dominant in some crystals, are peculiarly striking, the trapezohedrons being generally striated parallel to the intersection with the octahedron, owing to the development of two forms of oscillatory combinations.
		The smaller crystals are readily removed from the limestone matrix, but the larger ones are liable to break and have to be freed by careful tool work, an art much practiced by the mineral collectors of the vicinity.
	www.simplethinking.com /palache/pyrite.stm (564 words)

	Franklinite
		Many crystals show narrow faces of the dodecahedron on edges of the octahedron, and on some the dodecahedron is dominant, but all show the octahedron more or less developed.
		The trapezohedron n(211) was seen on only one crystal but there with distinct faces.
		Small cubic crystals showing the forms of figure 44 were found on the walls of a cavity containing leucophoenicite, with the faces etched but still measurable.
	franklin-sterlinghill.com /palache/franklinite.stm (1513 words)

	S-P-O-N-G-E (Site not responding. Last check: 2007-09-30)
		What Barney didn't realize was that the Sect apparently had left the Shining Trapezohedron for him to find, and at midnight of the third evening, it would summon a creature of hideous intent.
		Later, members of the Starry Wisdom Sect arrived to claim the Shining Trapezohedron, and were surprised to find Barney and Kilroy alive.
		The cult members (minus the bad priest) were apprehended, and the Shining Trapezohedron was locked away at SPONGE (in a well lit place).
	www.s-p-o-n-g-e.com /casefiles/cf15.php?sponge=df1c5ca61b8f841ab0f5e19d4f2966b8 (354 words)

	LEUCITE (Potassium Aluminum Silicate)
		At high temperatures, leucite is isometric and will form the isometric trapezohedron crystal form.
		Although the mineral is actually tetragonal, the outward shape is pseudo-isometric and thus the crystal form is actually pseudo-trapezohedral.
		The trapezohedron has 24 deltoid shaped faces, where each face occupies one third of the position of a single octahedron's face.
	mineral.galleries.com /minerals/silicate/leucite/leucite.htm (475 words)

	Tetragonal Crystal System VI (Site not responding. Last check: 2007-09-30)
		Derivation of a Tetragonal Trapezohedron from a Ditetragonal bipyramid.
		In the depicted case the Trapezohedron originates from the white faces of the Ditetragonal Bipyramid.
		The above Forms of this Class (the tetragonal pyramids and prisms, and the trapezohedron) were merohedrically derived from the holohedric Forms by dropping all the mirror planes.
	www.metafysica.nl /tetragonal_6.html (1565 words)

	[No title]
		Other forms commonly see are the prism, pyramid, bipyramid, trigonal trapezohedron, ditrigonal scalenohedron (12 faces), basal pinacoid, and an occassional pedion.
		Commonest forms are hexagonal and dihexagonal prisms, pyramids, bipyramids, hexagoanl trapezohedron, basal pinacoid and occassionally the pedion.
		Most commonly seen are the cube, octohedron, rhombic dodecahedron, cubic trapezohedron, trisoctahedron, tetrahexahedron, and hexoctahedron.
	www.angelfire.com /nc/GemstoneLady/crystals.html (299 words)

	Hexagonal Crystal System V
		The sides of these hexagonal sections correspond to faces of the trapezohedron, and if we let those faces extend then their mutual intersections determine their shapes.
		One such a hexagon represents a horizontal section through the trapezohedron somewhere above the plane which contains the horizontal crystallographic axes, the other represents such a section below that plane at a distance from it which is the same, but in the other direction, as that of the first section.
		In producing this Form -- the hexagonal trapezohedron -- the face can be imagined first to be subjected to the action of its nearest 2-fold rotation axis.
	home.hetnet.nl /~heackel/hexagonal_5.html (2611 words)

	Amethyst Galleries - THE ISOMETRIC SYSTEM
		Symmetry Elements: This is the most symmetrical possibility for a three dimensional system with 4 three fold axes, 3 four fold axes and 6 two fold axes as well as 9 mirror planes and a center.
		Common Forms: The unique gyroid form as well as the cube, octahedron, dodecahedron and trapezohedron, more rarely the trisoctahedron and tetrahexahedron.
		Common Forms: The unique diploid and pyritohedron as well as the cube, octahedron, rhombic dodecahedron, trapezohedron and more rarely the trisoctahedron.
	www.galleries.com /minerals/symmetry/isometri.htm (1204 words)

	Accounts of the Discovery of the Kunz Garnet
		It is in good condition, showing twenty faces of the trapezohedron and nearly half as many faces of the dodecahedron.
		In form the crystal is a combination of the 2-2 tetragonal trisoctahedron (trapezohedron), the predominating form, and I-dodecahedron, and 3-4 hexoctahedron.
		In form the crystal is a combination of the tetragonal trisoctahedron (trapezohedron), the predominating form, with the dodecahedron and the hexoctahedron.
	www.johnbetts-fineminerals.com /jhbnyc/articles/kunz-gar.htm (1554 words)

	Mineral Habits of the C.E. Duff and Son Quarry
		observed as modifications to the Diploid, Trapezohedron and Octahedron.
		True unmodified trapezohedrons are generally not encountered at this locality.
		This face is commonly quite small in comparison to the trapezohedral faces, but occasionally has been observed to be of equal size to the trapezohedron.
	www.vasichkominerals.com /Dufflatest.html (4597 words)

	The Wind Beyond the Walls of the Mind pt 27 (Site not responding. Last check: 2007-09-30)
		She fought back, every drop of her energy concentrated on mastering the glow of the Trapezohedron and directing its powers back against the fluctuating portal.
		At first nothing happened but suddenly as she expended one final burst of energy, the rupture in the Void rapidly began closing again and in a few seconds was sealed.
		Furious, Buffy rose to her knees in front of the Shining Trapezohedron and clenched her hands together in a fist.
	members.aol.com /connbkrts/windnov27.html (2370 words)

	Right and Left hand quartz crystals, Rockhounding Arkansas
		Figure 2 on page 10 of Volume III of Frondel's Dana's System of Mineralogy is an excellent drawing to show the relationship of the positive and negative rhombohedral faces to the a crystallographic directions.
		The next form to consider is the trigonal trapezohedron, more specifically the positive right trigonal trapezohedron, which is labeled x on crystal drawings of quartz.
		When present, it is seen at the junction of 2 prism faces m and the positive rhombohedron r and it displays a trapezohedral planar shape.
	www.rockhoundingar.com /quartz/rt.left.html (1519 words)

	RPG.NET Cyberthulhu Resources
		The originally went into space, to Yuggoth, for the purpose of getting a replacement for the Shining Trapezohedron, which was thrown into the sea at the end of "The Haunter of the Dark".
		They and the Mi-Go are researching ways to make Shining Trapezohedrons for all the Mythos deities.
		So far they have made one for Cthugha, which summons an avatar of him when the crystal is placed in fire, and one for Hastur, which summons the King in Yellow when lines from the play bearing his name are read to it.
	www.rpg.net /realm/cyber/corpcoc.html (555 words)

	The Cthulhu Lexicon - The S's
		The Shining Trapezohedron is directly related to a creature named the Haunter of the Dark, and is also linked to Nyarlathotep.
		By staring into the Shining Trapezohedron, the onlooker summons the Haunter of the Dark from across the fl gulfs of chaos.
		The Shining Trapezohedron was fashioned on dark Yuggoth by the Old Ones, who subsequently brought it to earth.
	members.tripod.com /NetherReal2/library/lex_entry/s1.htm (2542 words)

	scalenohedric forms
		We can consider a hexagonal trapezohedron as consisting of six antimers (each involving two of its faces) grouped around the main axis.
		When you came from the document treating of the Promorphology of Crystals, and when you want to go back to it, click HERE, or click the back button of your browser.
		The tetragonal trapezohedron can be viewed as consisting of four antimers (each involving two of its faces) grouped around the main axis.
	home.hetnet.nl /~turing/scaleno.html (865 words)

	LinkSwarm.com -- Have a Dell laptop? Charge up the battery and put us on your lap!
		It did not touch the bottom of the box, but was held suspended by means of a metal band around its centre, with seven queerly-designed supports extending horizontally to angles of the box's inner wall near the top.
		Of the Shining Trapezohedron he speaks often, calling it a window on all time and space, and tracing its history from the days it was fashioned on dark Yuggoth, before ever the Old Ones brought it to earth.
		It was treasured and placed in its curious box by the crinoid things of Antarctica, salvaged from their ruins by the serpent-men of Valusia, and peered at aeons later in Lemuria by the first human beings.
	www.linkswarm.com /viewlinkcomments-20414-.html (495 words)

	Tangor's Fan Fiction -
		Shining from the center of its strangely worked box of alien symmetry was the Trapezohedron, the many flattened surfaces of stone gleaming flly.
		My eyes traced the red striations orbiting the Trapezohedron, now lost forever to the eyes of man since it had been deposited in Narragansett Bay's deepest channel by the mysterious Dr. Dexter in 1935.
		He had been notable in the field of atomic physics following the last world war, but, uncaring of the danger, or, perhaps, strangely, forgetting his mortality, he flew too close to the testing of a hydrogen bomb near Bikini Atoll and his plane was engulfed by the fireball.
	www.erblist.com /fanfiction/pulps/prodigal.html (10595 words)

	SDNHM - Field Guide Minerals Glossary
		An oxide of iron and titanium that forms under relatively reducing chemical conditions.
		Crystals can form in the shape of a cube (like halite and pyrite), an octahedron (diamond), dodecahedron (garnet), trapezohedron (garnet), and others.
		The most common and recognizable in this class are the cube, the octahedron, and the dodecahedron.
	www.sdnhm.org /fieldguide/minerals/glossary.html (1183 words)

	Discworld Noir - Game Boomers Walkthrough by Chris McMullen
		Inside you meet Satrap, so speak to him about Horst, Gelid, and the Radiant Trapezohedron, and taunt him using the 'Taunt Satrap' topic to send him to meet his maker.
		In the Observatory, use the Star Map Two Conkers gave you with the mosaics to learn which star groups are which, then use the star map on the Small Group of Boring Stars, and then use the telescope to find out where the Trapezohedron is. Take the Astrolabe then go to the Mausoleum.
		At the Mausoleum, use the Astrolabe on the sky to find out which crypt holds the Trapezohedron, go to the crypt and use the Grotesque on top of the Crypt to open it.
	www.gameboomers.com /wtcheats/pcDd/DisWorNoir2.htm (3636 words)

	Leucitoid (Site not responding. Last check: 2007-09-30)
		Definition: The trapezohedron or tetragonal trisoctahedron; -- so called as being the form of the mineral leucite.
		definition of leucitoid, Leucitoid (n.) The trapezohedron or tetragonal
		Definition of Leucitoid (n.) The trapezohedron or tetragonal trisoctahedron; --
	www.bigletterlist.net /w/l/Leucitoid.htm (118 words)

	ANALCIME (Hydrated Sodium Aluminum Silicate)
		Well, not quite its own unique crystal, but pretty close.
		The minerals of the garnet group and high temperature leucite are the only common minerals that will also form the trapezohedron.
		Crystal Habits include the characteristic trapezohedron as well as the rare cube modified by trapezohedral faces.
	mineral.galleries.com /minerals/silicate/analcime/analcime.htm (368 words)

	Mainseek (Site not responding. Last check: 2007-09-30)
		Trapezohedron, a crystal used to send messages across andquot;the horrible...
		MADAGASCAR AMETHYST STUDY variety of Quartz,the art of lapidary...
		trapezohedron (just as we have a right hand...
	www.mainseek.com /trapezohedron.html (138 words)

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