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Topic: Carlsbad twin

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	Frequency of Quartz Twins
		The frequency of twin types and the handedness were determined for 1,179 crystals from six localities by the use of etch figures developed with hydrofluoric acid.
		Many of the references are concerned with descriptions and study of quartz twins and twinning, the nature of the twin boundaries, quartz etch figures, vicinal faces, relations of form and twinning to temperature of formation, as well as geology and occurrence.
		In the albite-Carlsbad twin the simplest form has only two parts (1 and 2' of Winchell, 1933); part 1 is in the original position and part 2' is in a position that can be obtained by two rotations, or corresponding to the albite law and one to the Carlsbad law.
	www.minsocam.org /MSA/collectors_corner/arc/qtztwin.htm (6204 words)

	ORTHOCLASE - LoveToKnow Article on ORTHOCLASE (Site not responding. Last check: 2007-10-12)
		Twinning is frequent, and there are three well-defined twin-laws: (1) Carlsbad twins (fig.
		Such twinned crystals are found at Carlsbad in Bohemia and many other places.
		These twins, in which n (021) is the twin-plane, are common at Baveno.
	33.1911encyclopedia.org /O/OR/ORTHOCLASE.htm (759 words)

	Igneous minerals image gallery
		Note the "grid" or "tartan plaid" twinning pattern that results from crossing albite and pericline twin domains that form during inversion of monoclinic orthoclase to triclinic microcline during cooling.
		Faint twins in the myrmekite clearly shows that the probably quartz "worms" are in a plagioclase matrix.
		Albite twinning in the plagioclase is clearly visible.
	www.union.edu /PUBLIC/GEODEPT/COURSES/petrology/ig_minerals.htm (2008 words)

	Carlsbad History Tour
		Later, Carlsbad was renamed "Carl" for a time because of confusion with Carlsbad, New Mexico on train schedules and because of hysteria during World War I. Popular demand restored the former name.
		Carlsbad is an old village dating from the 1880s.
		This is the former mansion of Gerhard Schutte, a co-founder of Carlsbad.
	www.carlsbad.ca.us /historic.html (624 words)

	Feldspar Mineralogy (Site not responding. Last check: 2007-10-12)
		The twin law - {010} indicates that the twinning occurs perpendicular to the b crystallographic axis.
		Pericline twinning usually occurs in combination with albite twinning in microcline, resulting in a cross-hatched pattern, called tartan twinning that easily distinguishes microcline from the other feldspars under the microscope.
		Carlsbad twinning is the most common type of twinning in orthoclase, and is thus very diagnostic of orthoclase when it occurs.
	www.geology.um.maine.edu /GES555/feldspar/minerology.html (366 words)

	McMillin Realty - Community Carlsbad
		In 1887, four years after the railway's arrival, the Carlsbad depot was built; by 1905 it was a shipping point for locally grown fruit, vegetables, and flowers.
		Soon, a hundred-room hotel was built, and the town was touted as a "seaside sanitorium." The spacious mansion later became known as one of Carlsbad's Twin Inns; now it's the renowned Neiman's restaurant.
		Yet the small-town atmosphere of the early 19th Century is preserved in historic Carlsbad's downtown, and much of the valleys, hillsides, and rocky outcroppings have changed little since the time of the Luiseños.
	www.mcmillinrealty.com /mrem_agentadmin/Community_Carlsbad.asp (249 words)

	Document Imaging and Scanning Conversion Services - Twin Imaging Technology
		Twin Imaging provided scanning, digital editing, and PDF conversion services to produce a high quality and visually clear product that readers of Garden Railways, Classic Toy Trains, and Fine Scale Modeler will enjoy for years to come.
		Twin Imaging used a combination of high speed scanning and flatbed scanning to produce a finished product that can easily be read on a monitor and just as easily printed on a laser printer, etc. These historic hard-to-find manuals are now preserved for current and future flight enthusiasts to enjoy.
		Twin Imaging Technology is proud to be able to participate in Ever After's 3rd annual Survivor Crop 2004.
	www.twinimaging.com /latestnews.html (1286 words)

	All Available Postcards for US State & Town Views/New Mexico/Carlsbad
		Carlsbad Cave National Monument located 30 miles S. of Carlsbad, N. is the largest and most spectacular cave in the world.
		Carlsbad Caverns entrance is only a short drive of 7 miles from White's City, N. The Big room of huge size has many for maintains which are massive as well as magnificent.
		The hewitching caverns of Carlsbad Caverns National Park, in Southeastern New Mexico, are world famous for their enormous rooms and passages, and for the variety and delicate coloring of their formations.
	www.cardcow.com /viewall.php?cat=65804 (1315 words)

	Orthoclase (Site not responding. Last check: 2007-10-12)
		Orthoclase does not show the lamellar twinning that is common in microcline and is occassionally present as striations on cleavage surfaces.
		Two different twin laws, the Manebach and Baveno laws, produce crystals with one prominant mirror plane and penetrant angles or notches into the crystal.
		Although twinning in general is common for orthoclase, single crystals showing a perfect twin are rare and are often collected by twin fanciers.
	www.seismo.berkeley.edu /~jill/wisc/moreorth.html (423 words)

	Gemstones Glossary,Gemstones Terminology,Gemstones Terms,Online Gemstones Glossary,Gemstones Dictionary
		It is form of penetration twinning where the two Orthoclase crystals form interpenetrating twins.
		It is a form of contact twinning where six Chrysoberyl crystals join at the base to form a six-pointed formation.
		It is a type of contact twinning where two single quartz crystals are joined from their base at an angle near 90°.
	www.mineralszone.com /glossary/gemstones-glossary.html (3583 words)

	Twins and Twinning
		Twins represent a symmetrical intergrowth of two or more domains of a crystal that have different atomic orientations.
		The twin law that describes the twin operation specifies the twin operation and the crystallographic plane or axis associated with the twinning.
		Twins by reflection parallel to one of the rhombohedron crystal faces {101} or {111}
	www.geology.wisc.edu /~g203/twins.html (582 words)

	Carlsbad Real Estate - Carlsbad CA - Carlsbad California Homes
		Carlsbad CA Located within an easy commute by car or train to San Diego, Carlsbad CA is a growing concern.
		People are attracted to Carlsbad because of its near perfect weather, the miles of popular Carlsbad beaches, eclectic shopping areas, the superlative Carlsbad schools and comfortable, family oriented neighborhoods.
		The City of Carlsbad is pro-active when it comes to attracting ‘clean’ enterprises to the area.
	www.northcountyluxuryhomes.com /Carlsbad_Real_Estate/page_645481.html (379 words)

	MICROCLINE (Potassium Aluminum Silicate)
		Twinning is common in all feldspars and follow certain twin laws such as the Albite Law, the Pericline Law, the Carlsbad Law, the Manebach Law and the Baveno Law.
		Albite and pericline Law type twinning produce stacks of twin layers that are typically only fractions of millimeters to several millimeters thick.
		These twinned layers can be seen as striation like grooves on the surface of the crystal and unlike true striations these also appear on the cleavage surfaces.
	www.galleries.com /minerals/silicate/microcli/microcli.htm (551 words)

	Frequency of Quartz Twins
		Brazil twins and Dauphiné-Brazil twins, with respect to to dominant handedness in each crystal, also show right- and left-handed quartz in about equal proportions.
		Thus it is not possible to relate twin ratios and frequencies at this time to geological occurrence.
		Dauphiné twin boundaries are irregular, whereas Brazil boundaries are more likely to be parallel to crystallographic planes.
	www.minsocam.org /msa/collectors_corner/arc/qtztwin.htm (6204 words)

	Welcome to Carlsbad, California
		Carlsbad is known as ‘The Village by the Sea’.
		His spacious mansion, built in 1887, was later known as one of the Carlsbad Twin Inns.
		Carlsbad is blessed with three picturesque lagoons, each with distinctive ecosystems.
	www.theblendmagazine.com /Carlsbad (1134 words)

	VirtualTourist.com - lmkluque's Carlsbad Restaurant Tips (Site not responding. Last check: 2007-10-12)
		Nice Salad bar and a section of side dishes were fresh and flavorful, but it was the variety of meats brought to the table on skewers by gaucho clad waiters that really topped off the meal.
		Neiman's is housed in one of Carlsbad's oldest and most striking buildings, which began as two mansions, mirrored in image.
		I hadn't tried the Carlsbad location but found it to be as nice and charming as the San Diego location in Hotel Circle.
	members.virtualtourist.com /m/16c12/b77bb/2 (1115 words)

	Carlsbad home for sale, downtown San Diego
		If you want a new home in Carlsbad Ca, you need a Carlsbad Realtor who knows the area and what the best deals are.
		If you are a seller, with a Carlsbad home for sale, we are your best choice for a Carlsbad real estate agent.
		All 3 bedrooms are located on the second floor; two with queen beds, and a third with 2 twin beds.
	www.sandiego.houserebate.com /san-diego-real-estate.asp (569 words)

	Glossary of Rock and Mineral Terms - P
		Examples: fluorite twin, carlsbad twin, staurolite twin, and swallowtail twin.
		Form of twinning where the crystals intergrow in a repeated pattern.
		Twinned crystals that are twinned through polysynthetic twinning.
	www.inlandlapidary.com /user_area/glossaryP.asp (2521 words)

	SignOnSanDiego.com Neighborhood Guide to Carlsbad
		Off season, or to quell a shopping jones any time of year, the Carlsbad Premium Outlets (formerly Carlsbad Company Stores) is a spacious open-air outlet mall with more than 70 stores and plenty of tasty pit stops, from Bellefleur's sophisticated but casual ambiance to family-friendly Ruby's Diner.
		Built in 1887 for one of Carlsbad's founding fathers, Gerhard Schutte, this property was purchased by the Kentner family in 1919 and converted to a restaurant -- The Twin Inns, which was known for its fried chicken and the man-sized plaster chickens out front.
		Carlsbad is a growing community, and one of its newer endeavors is New Village Arts, a worthy theater group.
	www.signonsandiego.com /citysearch/feature/392 (863 words)

	Ocean House at Carlsbad Village
		Carlsbad's most prominent Victorian mansion and the site of longtime restaurant Neiman's (and previously The Twin Inns since 1919), entered a new chapter with the opening of Ocean House mid-March.
		Built in 1887 by the owner of Carlsbad Land and Water Co., Gerhard Schutte, the expansive home became a favorite stopping place for travelers and diners in the 1920s.
		The rotunda salon, an ideal setting for weddings, Sunday brunch and large parties, was added in 1922 to accommodate increased traffic between Los Angeles and San Diego.
	www.oceanhousecarlsbad.com /news (332 words)

	ERSC 3P21 Lab 2
		The extinction angle is controlled by grain orientation and indicatrix orientation, therefore requiring a number of grains (10 observations) to be recorded and the largest angle used to determine the composition.
		b) The twin lamellae are crisp and sharp indicating that the (010) composition plane is vertical.
		On the left side of the Carlsbad twin measure the extinction angle, in both directions, from the albite twin lamellae to the fast ray direction, as for the Michel-Levy method.
	www.brocku.ca /earthsciences/people/gfinn/petrology/321lab2.htm (755 words)

	Carlsbad Vacation Rentals in California - Carlsbad Beach House from Vacation Homes.com (Site not responding. Last check: 2007-10-12)
		The house is only a half a block away from the stairs that take you down to the surfs edge and three miles from downtown Carlsbad, Ca.
		All questions about "Carlsbad Beach House", the vacation rental in Carlsbad featured on this page, must be answered by the manager.
		If you are interested in "Carlsbad Beach House", a Carlsbad Villas / Homes, click here to send them an email.
	vacationhomes.com /17222 (441 words)

	Travel Information About Carlsbad California : Carlsbad CA CVB
		The first mention of Carlsbad in the annals of history was hardly flattering.
		The Carlsbad depot was built in 1887 by the Arizona Eastern Railway.
		Schutte's spacious mansion, built in 1887, later became known as one of Carlsbad's Twin Inns.
	www.carlsbadca.org /about/index.cfm?action=heritage (724 words)

	Cavernous Carlsbad
		It's an answer that comes quickly to mind after touring the Carlsbad, a large, well-designed model home on the hills of the Dublin Ranch Golf Club.
		Aside from the striking twin stairs and toilets, the Carlsbad model, at more than 5,500 square feet, is heavy with features.
		The twin staircases in the lofty foyer frame the entrance to a dinning room at the back of the house.
	www.sfgate.com /cgi-bin/article.cgi?file=/c/a/2003/08/24/RE229993.DTL&type=printable (454 words)

	lc3-6
		In other places the Carlsbad-twinned plagioclase crystals are deformed and replaced progressively by microcline and wartlike myrmekite, and the microcline inherits its Carlsbad twinning from the former plagioclase.
		During replacement, the calcic core was truncated by the microcline (fl and gray, right side) so that the rounded-part of the plagioclase core at the right end is missing, but the Carlsbad twin plane is continuous between the two feldspars.
		This is strong evidence that the microcline (and the granite) did not form by a crystallization from a magma but resulted from replacement of the former diorite.
	www.csun.edu /~vcgeo005/lc3-6.html (168 words)

	Photomicrographs of Feldspar
		This photo shows a large plagioclase grain which is easily identified by the twinning in the photograph with polars crossed.
		Exact types of twinning are best determined on a universal stage, but albite, carlsbad, and pericline twins are probably present here.
		Although such twinning is characteristic of most triclinic alkali feldspars, it is most commonly shown by microcline.
	plaza.snu.ac.kr /~lee2602/atlas/feldspar.html (360 words)

	Salt River photomicrographs - AKLIS project - St. Croix, U. S. Virgin Islands
		Same sherd as above, note the twinning of the feldspars (both polysynthetic and Carlsbad twin laws).
		Same rock fragment, note what appears to be Carlsbad twinning (and sericite alteration) on the feldspar.
		Grog fragment (subrounded) with angular quartz and feldspar grains.
	people.uncw.edu /smithms/aklis/saltriver.html (468 words)

	Alan Guisewite's Mineral Collection Images: Systematic Tectosilicates Page
		Labradorescence is iridescence due to the interference of light by reflection from parallel inclusions or between twinned layers.
		A strange, elongated twinned crystal of anorthoclase (a member of the feldspar group and the midmember of the microcline and orthoclase series) without matrix from Mt.
		The Woodleaf Quarry in Woodleaf, Rowan County, North Carolina produces orange, interpenetrant chabazite twins - a hybrid of the acadialite and phacolite varieties.
	www.cs.cmu.edu /~adg/adg-psstimages.html (5636 words)

	ANORTHITE (Calcium Aluminum Silicate)
		Albite Law twinning produces stacks of twin layers that are typically only fractions of millimeters to several millimeters thick.
		Although twinned crystals are common, single crystals showing a perfect twin are rare and are often collected by twin fanciers.
		Lamellar twinning may cause a grooved effect on cystal and cleavage surfaces that appear as striations.
	mineral.galleries.com /minerals/silicate/anorthit/anorthit.htm (350 words)

	Untitled Document (Site not responding. Last check: 2007-10-12)
		Find a grain the shows both Carlsbad and albite twins so that the (010) twins planes are vertical or nearly so.
		When traces of twins are parallel to N-S cross hairs and 45° to N-S then half of the grain will be extinct and half will not.
		Use the average extinction angle for each Carlsbad section and the appropriate chart to determine the An content of the plagioclase.
	faculty.fortlewis.edu /GONZALES_D/Geol208/GEOL208_Notes/Carlsbad_Albite.html (139 words)

	Aklis photomicrographs - AKLIS project - St. Croix, U. S. Virgin Islands
		Mineral grains are quartz (both monocrystalline and polycrystalline) and feldspar (both heavily altered plagioclase and blocky Carlsbad twinned k-spar).
		There are some quartz (monocrystalline and polycrystalline) and feldspar (probably K-spar, Carlsbad twinned) mineral grains in the temper, but it is dominated by shale rock fragments (which mostly have tiny feldspar mineral grains within them).
		Both polysynthetic and Carlsbad twin laws shown in these fragments.
	people.uncw.edu /smithms/aklis/aklis_pet.html (1373 words)

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