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Topic: Tenebrescence

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	Tenebrescence (Site not responding. Last check: 2007-09-11)
		Tenebrescence, also known as reversible photochromism, is the ability of minerals to change colour when exposed to sunlight.
		Tenebrescent minerals include hackmanite sodalite, spodumene and tugtupite.
		Tenebrescent behavior is exploited in synthetic materials for the manufacture of self-adjusting sunglasses, which darken on exposure to sunlight.
	publicliterature.org /en/wikipedia/t/te/tenebrescence.html (77 words)

	FLUORESCENT ILÍMAUSSAQ - TENEBRESCENCE INTRO
		Tenebrescence is a remarkable property of certain minerals to temporarily change their color.
		Very few minerals exhibit tenebrescence, also known as reversible photochromism, but at least two that do—the ‘hackmanite’ variety of sodalite, and tugtupite—occur at Ilímaussaq.
		In addition to having brilliant orange fluorescence under UV, tenebrescent varieties of sodalite from Ilímaussaq exhibit two distinct color states in daylight: a pale magenta to deep purple state, and a pale green or yellow to colorless state.
	luminousminerals.com /greenland/tenebrescence.shtml (453 words)

	WHAT'S NEW? - Thomas S. Warren Museum of Fluorescence (Site not responding. Last check: 2007-09-11)
		Equally remarkable is the strong tenebrescence of this specimen, which in daylight changes color from pale green to deep purple as the specimen is exposed to shortwave ultraviolet light.
		Mark has been experimenting with the tenebrescence of the Greenland sodalites and has posted some memorable photos of them on his web site.
		The color of fluorescence changes from bright golden yellow to deep ruddy orange as the sodalite changes from its normal (bleached) to fully tenebresced states.
	www.sterlinghill.org /warren/whatsnew_aug_02.htm (1108 words)

	Meng Cao, Kemisk Institut
		It is speculated that this reversible optical phenomenon, known as tenebrescence, might be related to trace amounts of both sodium mono- and poly-sulphide residing in the large cavities of the sodalite structure.
		Due to the technological interest in photochromic materials for applications such as, information storage, filter optics and display, there have been attempts in the 1950-1970's to synthesis tenebrescent sodalite, which have been met with various degrees of success.
		It will be interesting to try and unravel the connections, if any, between the tenebrescent and photoluminescent mechanisms that often coexist in these materials.
	www.sdu.dk /Nat/Chem/staff/stu/mca.HTML (381 words)

	Glossary of Terms for the Collector of United States Stamps (Site not responding. Last check: 2007-09-11)
		Tenebrescent - a chemical agent that when added to stamp papers or printers ink causes them to appear darker when viewed under long wave ultra-violet light.
		This is the opposite of a fluorescent agent that causes paper or inks to glow brighter under long wave ultra-violet light.
		Example of tenebrescent ink: 2001 34¢ Flag over Farm, water activated gum, plate P2222.
	glossary.usstamps.org /glossary/glbrowse.php?alpha=tv (1779 words)

	FLUORESCENT ILÍMAUSSAQ - MINERALS - SODALITE
		The most intensely tenebrescent sodalite found is transparent to white in daylight and turns deep amethyst purple after exposure to shortwave ultraviolet.
		This color change is so strong that when viewing a specimen under shortwave ultraviolet, the apparent fluorescent response changes; from an initial yellow-orange to deep rust or reddish-orange color, in seconds.
		Ilímaussaq sodalite provides some of the best and strongest fluorescent and tenebrescent responses known for the species.
	luminousminerals.com /greenland/sodalite.shtml (373 words)

	HG - 2003
		After SW and even LW exposure, the incredibly tenebrescent gray sodalite (hackmanite) remains deep grape purple in sunlight for many minutes.
		The most aesthetically pleasing and intensely tenebrescent hackmanite was a two inch wide gray vein outlined by non-tenebrescent white matrix rock.
		Nice experiences have been a talk about the entire experience given at Ultraviolation 2003, and a discussion of the tenebrescence of hackmanite at the FMS northeast regional meeting.
	www.minershop.com /html/hg_-_2003.html (2432 words)

	Tucson Show 2001 (Site not responding. Last check: 2007-09-11)
		Of course, this is from my own perspective, since I started to focus my collection towards specimens of crystallized minerals that also present fluorescence.
		In the same category, Nordic Mineral of Sweden and Charles B. Ward Fluorescent Minerals presented Tugtupite from Greenland, which also has tenebrescence (magenta) aside from orange fluorescence under LW UV and red fluorescence under SW UV.
		On the same token, I acquired an excellent specimen of Powellite with lustrous and sharp xls which exhibit a very deep yellow under the daylight and both SW and LW UV.
	members.shaw.ca /dsbalan/tucson01.htm (389 words)

	Fluorescence by Julian Gray
		When the basketball/electron is on the court/lower position, the mineral has a different color (Nassau, 1978).
		This whole color change phenomenon is called tenebrescence or photochroism (Robbins, 1994).
		A combination of a chemical impurity and a tiny amount of radiation will cause quartz to become purple or light brown.
	www.gamineral.org /fluorescence.html (1319 words)

	June 2006 (Site not responding. Last check: 2007-09-11)
		Rossman first described the alexandrite effect (changes in mineral color depending on the illumination source used, such as sunlight or incandescent lighting).
		He then discussed tenebrescence (color change after exposure to sunlight).
		One of the highlights of Dr. Rossman's presentation was the cause of the star phenomenon in certain minerals.
	www.mineralsocal.org /bulletin/2006_jun.htm (2016 words)

	BOOKS ON FLUORESCENT MINERALS
		Chapter four, i.e., pages 32 through 189, contains the color illustrations — a fantastic collection of color photographs of fluorescent minerals illustrated in both daylight, as well as in either SW or LW UV.
		Several close-up photos are included, and a few examples illustrate phosphorescence or tenebrescence.
		Very important -- a color chart is included, covering the 28 basic, i.e., most often encountered fluorescent colors.
	www.minresco.com /uvlamps/uvp/fbooks.htm (1509 words)

	Fluorescent Mineral Photo Gallery (Site not responding. Last check: 2007-09-11)
		Some minerals respond in a different color to a different UV wavelength.
		Fluorescent minerals can also exhibit phosphorescence, tenebrescence, and thermoluminescence.
		For more information about fluorescent minerals, click here
	users.ece.gatech.edu /~hamblen/uvminerals (322 words)

	The Denver Gem & Mineral Show - Presentations
		Also, such factors as number of specimens, size of specimens, mineral labels, and windows for display cases will be discussed.
		He will discuss and demonstrate the four different UV wavelengths; SW, MW, LW350 and LW370 and will also demonstrate the tenebrescence of hackmanite, and show some unusual fluorescent specimens.
		The future of UV lights and fluorescent minerals will be mentioned.
	www.denvermineralshow.com /2004/aboutevents_2004.htm (1298 words)

	mineraldemonstrations-pg.5.html
		The most amazing Geological phenomenon that is Demonstrated in "Electric Ladyland - the First Museum of Fluorescent Art"
		is a very rare Mineralogical occurrence known as "Tenebrescence".
		.Ý This is the opposite of Tenebrescence, where the change in color can be made an endless amount of times.
	www.electric-lady-land.com /mineraldemonstrations-pg.5.html (1293 words)

	Definition of tenebrescence - Merriam-Webster Online Dictionary
		Click here to search for another word in the Merriam-Webster Online Dictionary.
		Visit Britannica.com for more information on "tenebrescence "
		Get the Top 10 Search Results for "tenebrescence "
	www.m-w.com /dictionary/tenebrescence (55 words)

	Tozour Family's Fluorescent Rocks Bancroft Page 2
		Midrange and longwave UV Gem apatite, Liscomb Property, Wilberforce, Ont., Elizabeth's collection, purchased at Princess Sodalite Mine
		Tenebrescence (color change) after exposure to shortwave UV Hackmanite, Davis Quarry (collected at the CN Dump) Bancroft, ON, Canada
		Longwave UV Hackmanite, Davis Quarry, Bancroft, ON, Canada
	mywebpages.comcast.net /jtozour/Bancroft2/Bancroft2.html (174 words)

	Search F-Terms 4H006 AB92 - Optical characteristics (application from infrared absorber, ultraviolet absorber, X-rays ... (Site not responding. Last check: 2007-09-11)
		Search F-Terms 4H006 AB92 - Optical characteristics (application from infrared absorber, ultraviolet absorber, X-rays absorber, luminescence materials, and tenebrescence compound)
		- Search AB92 Optical characteristics (application from infrared absorber, ultraviolet absorber, X-rays absorber, luminescence materials, and tenebrescence compound)
		Tip: Click term codes to search higher subgroups.
	cxp.paterra.com /ftermsrch4H006AB920.html (77 words)

	Attract Mode (Site not responding. Last check: 2007-09-11)
		Sword of the Eldest (also not perfect but has some subtle appropriateness)
		Tenebrescence (I think the problem with this one is apparent, even if it fits)
		The current trilogy name I have poked at is ‘Trilogy of Ghosts and Shadows’.
	www.attractmode.net /?cat=9 (4670 words)

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