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Topic: Brookite


In the News (Mon 21 Apr 14)

  
  BROOKITE - LoveToKnow Article on BROOKITE   (Site not responding. Last check: 2007-10-29)
The acute bisectrix of the optic axes is perpendicular to the orthopinacoid (a) for all colors, so that this phenomenon of the crossing of the optic axial planes may be readily observed in the thin tabular crystals of the first-mentioned type.
Brookite occurs only as crystals, never in compact masses, and is usually associated with either anatase or rutile.
Crystals of brookite, as well as of anatase and rutile, have been prepared artificially by the interaction of steam and titanium fluoride, the particular modification of titanium dioxide which results depending on the temperature at which the reaction takes place.
www.1911encyclopedia.org /B/BR/BROOKITE.htm   (536 words)

  
 Rocks & Minerals: Brookite: Dodo Mine, Subpolar Urals, Russia - Connoisseur's Choice   (Site not responding. Last check: 2007-10-29)
Brookite is a transparent to opaque mineral that occurs in various shades of red- and yellow-brown through dark brown to fl.
It is brittle with a subconchoidal to irregular fracture and exhibits indistinct cleavage on {120} and a trace on {001}.
Brookite is orthorhombic (2/m 2/m 2/m) and is typically encountered in crystals that are tabular on {010} and elongate and striated parallel with [001].
www.findarticles.com /p/articles/mi_m0GDX/is_3_78/ai_100735739   (1362 words)

  
 Mineralogical Record: Brookite: From Hale Creek, Trinity County, California
Brookite, the orthorhombic trimorph of TiO^sub 2^, occurs in fine, doubly terminated, deep reddish brown crystals in chert cutting Hale Creek, Trinity County, California.
Among the three crystallographic variations of TiO^sub 2^, anatase and brookite are the rarest in California.
The brookite crystals attain a maximum length of 3 mm, and occur either free-standing on the quartz or lying flat.
www.findarticles.com /p/articles/mi_qa3672/is_200007/ai_n8926692   (881 words)

  
 brookite.htm   (Site not responding. Last check: 2007-10-29)
Description: Brookite is a relatively uncommon mineral found as an accessory in a number of igneous and metamorphic rocks including granites, syenites, gneisses, and schists.
MARATHON COUNTY: Brookite is widespread as fl, green, yellow and light brown stubby to platy crystals averaging 1 mm.
WOOD COUNTY: Brookite is rarely found as tan micro-crystals associated with anatase and rutile at the Tork and Haessley Quarries near Wisconsin Rapids (Buchholz, 1996).
www.uwrf.edu /~wc01/brookite.htm   (137 words)

  
 Introduction   (Site not responding. Last check: 2007-10-29)
Brookite is rare, but is found most often in hydrothermal zones associated with contact metamorphism (Force 1991).
This was later supported by observation of rutile (Penn and Banfield 1999) and brookite (Penn and Banfield 1998) at the {112} twin boundaries in anatase nanocrystals.
The structure of both brookite and anatase can be described as the stacking of slabs of octahedra with different orientations (brookite: AABB along [100]; anatase: AAAA along [101]), and like anatase, brookite contains "half" of the rutile structure (ABAB along [100]; Banfield and Veblen 1992).
www.public.asu.edu /~bdegreg/TiO2   (836 words)

  
 Mineralogy - Oxides and Hydroxides
Brookite Native aluminium oxide occurring in cleavable masses or in pyramidal crystals.
Brookite is a polymorph with two other minerals.
Brookite shares many of the same properties as rutile such as color and luster and some properties are nearly the same such as hardness and density.
l2l.port5.com /s_geol/mnr_oxid.html   (2405 words)

  
 Magnet Cove Mineral Photos, Rockhounding Arkansas
Brookite on smoky quartz has been collected in the Magnet Cove area since before 1850.
In this specimen, brookite formed first and as the temperature rose, rutile began to replace it.
So this example retains the external crystal shape (form) of brookite, but is now composed of numerous interlocking small crystals of rutile.
rockhoundingar.com /locations/magcovegal.html   (430 words)

  
 Proposed Work   (Site not responding. Last check: 2007-10-29)
Maximum yield of brookite occurs with a 0.05 molar titanium ion concentration.
Dried brookite powder will be placed in alumina crucibles set in a steel block and heated to the appropriate temperature, similar to kinetic experiments with anatase (Banfield et al.
Brookite is less stable than anatase and rutile (Post and Burnham 1986), so the reaction should proceed more quickly.
www.public.asu.edu /~bdegreg/TiO2/work.html   (468 words)

  
 BROOKITE - Online Information article about BROOKITE
Crystals of brookite, as well as of anatase and rutile, have been prepared artificially by the interaction of See also:
Brookite is liable to become altered to rutile: aggregates of rutile needles with the See also:
form of brookite (arkansite) are not uncommon at Magnet Cove, Arkansas.
encyclopedia.jrank.org /BRI_BUN/BROOKITE.html   (616 words)

  
 Rutile - Wikipedia, the free encyclopedia
Rutile has a sub-conchoidal fracture, is brittle, has a metallic-adamantine lustre, and is generally reddish brown but also sometimes yellowish, bluish, or violet.
Rutile is the most stable form of titanium dioxide and is produced at the highest temperatures, with brookite being formed at lower temperatures and octahedrite being formed at still lower temperatures.
Rutile is found as an accessory mineral in some altered igneous rocks, and in certain gneisses and schists.
en.wikipedia.org /wiki/Rutile   (343 words)

  
 MFA - CAMEO - Material Description   (Site not responding. Last check: 2007-10-29)
One of three naturally occuring isomorphic forms of titanium dioxide: anatase, rutile and brookite.
Brookite forms red-brown or flish crystals with a metallic luster.
Brookite deposits occur in the Alps and in Wales (Fronolen).
www.mfa.org /_cameo/frontend/material_description.asp?name=brookite&language=1   (70 words)

  
 Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
Samples contained brookite, anatase, rutile and the new corundum-like phase: Brookite's concentration was larger than 50 wt%, while the one of the corundum-like phase reached 20(6) wt%.
The local symmetry and the atomic bond lengths of these two phases depended on the crystallite size; for both, there is a correlation between the evolution of the atomic bond lengths with temperature and their transformation into another phase.
The hydrothermal conditions stabilized brookite, anatase, and the corundum-like phase at high temperature: This last phase was stable in air, even at 900 deg.
www.osti.gov /energycitations/product.biblio.jsp?osti_id=20561590   (314 words)

  
 Brookite   (Site not responding. Last check: 2007-10-29)
These samples of brookite are displayed in the Smithsonian Museum of Natural History.
Brookite is an oxide mineral of titanium with the composition TiO
Brookite in wafer-like crystals is embedded in this larger rock sample along with small quartz crystals about the size of rice grains.
hyperphysics.phy-astr.gsu.edu /hbase/minerals/brookite.html   (90 words)

  
 BROOKITE - Encyclopedia Britannica - BROOKITE - JCSM's Study Center   (Site not responding. Last check: 2007-10-29)
The commoner type of crystals are thin and tabular, and often terminated by numerous small.and brilliant faces (fig.
The acute bisectrix of the optic axes is perpendicular to the orthopinacoid (a) for all colours, so that this phenomenon of the crossing of the optic axial planes may be readily observed in the thin tabular crystals of the first-mentioned type.
Brookite is liable to become altered to rutile: aggregates of rutile needles with the form of brookite (arkansite) are not uncommon at Magnet
jcsm.org /StudyCenter/Encyclopedia_Britannica/BRI_BUN/BROOKITE.html   (590 words)

  
 Childrens Kites
Brookite are the UKs oldest kite manufacturer, and have been making quality kites for nearly 100 years (in 1910 Marconi used a Brookite kite when sending the worlds first transatlantic wireless transmission!).
Brookite remain a leading kite manufacturer to this day, with a commitment to provide quality product at competitive prices.
All of their childrens kites use the same materials as their regular sports and adult high specification stunt kites, with spinnaker nylon material across fibreglass frames.
www.thekidswindow.co.uk /games/childrens-kites.htm   (842 words)

  
 Titanium
Rutile and brookite each have a specific gravity of over 4.0 and the same chemical formula, but differ in crystalline structure.
Both are commonly fl in Arkansas and occur as grains and crystals, water-worn pebbles and granules, or crystalline masses.
At Magnet Cove, two general types of rutile-brookite deposits are present: feldspar-carbonate-rutile veins in the intrusion and brookite-quartz veins in the altered Arkansas Novaculite contact zone adjacent to the intrusion.
www.state.ar.us /agc/titanium.htm   (670 words)

  
 Millennium Minerals - High Octave Stones   (Site not responding. Last check: 2007-10-29)
High octave stones channel spiritual and cosmic energies not readily accessible on the Earth, while preserving the integrity of the energy transmitted.
Work with brookite to energize chakras, energy fields, environments, and to supplement the energy of other crystals and minerals.
Brookite dispels apathy and lethargy and supports the ability to flow.
www.millenniumminerals.com /stones/octave.html   (296 words)

  
 Rocks & Minerals: Brookite, Rutile Paramorphs after Brookite, and Rutile Twins from Magnet Cove, Arkansas.@ HighBeam ...   (Site not responding. Last check: 2007-10-29)
Brookite, Rutile Paramorphs after Brookite, and Rutile Twins from Magnet Cove, Arkansas.
The author the examines the discovery of brookite at Magnet Cove, Arkansas.
Although the Magnet Cove area of Arkansas was noted before 1850 in the literature (Macrery 1806; Schoolcraft 1819; Bringier 1821; Featherstonhaugh 1835; Powell 1842), it was not seriously noticed by mineralogists and mineral collectors until the publication of Shepard's paper (1846) concerning the discovery of "arkansite" (brookite).
www.highbeam.com /library/doc0.asp?DOCID=1G1:57512339&refid=holomed_1   (231 words)

  
 kites home   (Site not responding. Last check: 2007-10-29)
These became the mainstay of Brookite for some 60 years and it was only in the early eighties that Brookite began to diversify, firstly into hobby horses and then toy sailing boats, windthings and most recently a range of bubble products.
Fibreglass and carbon struts have taken over from wood and the range of fittings on the kites have improved beyond all recognition.
You can purchase a Brookite with confidence - knowing that you are buying a quality product from a company who really cares.
www.planetwebshop.com /html/kites_home.html   (271 words)

  
 Alan Guisewite's Mineral Collection Images: Miscellaneous Systematic Oxides Page
Brookite is a trimorph with rutile and anatase - this thumbnail's from Magnet Cove, Hot Springs County, Arkansas.
The brookites from Magnet Cove are very different from that found elsewhere - the crystals are usually pinacoidally-terminated octahedrons with metallic etched/pitted faces.
A gorgeous miniature of almost gemmy reddish-brown brookite crystals on matrix from Grindelwald, Bern, Switzerland.
www-2.cs.cmu.edu /~adg/adg-psoimages.html   (6328 words)

  
 Rutile-Brookite   (Site not responding. Last check: 2007-10-29)
RB-1 Rutile paramorph of Brookite - Jones Farm, Magnet Cove, Hot Springs County, Arkansas $90; Rutile has beautifully taken the form of tabular brookite crystals, and additionally shows very sharp twinning.
RB-2 Rutile paramorph of Brookite - Jones Farm, Magnet Cove, Hot Springs County, Arkansas $125; A very sharp cyclic twinned example, this one is also a "floater" showing no signs of attachment to matrix.
RB-3 Rutile paramorph of Brookite - Jones Farm, Magnet Cove, Hot Springs County, Arkansas $175; Another outstanding sharp cyclic twin specimen, this one features two large crystals (the largest is 1.5 cm and double terminated).
www.kcminerals.com /rutile-brookite.htm   (266 words)

  
 End Caps - UK (England, Scotland, Wales, Northern Ireland)
Brookite, London, UK Brookite offer a wide selection of Traditional, sports and power kites and other outdoor flying toys also kids activity toys
Brookite, Staines, Middlesex, UK Brookite offer a wide selection of Traditional, sports and power kites and other outdoor flying toys also kids activity toys
Brookite, UK Brookite offer a wide selection of Traditional, sports and power kites and other outdoor flying toys also kids activity toys
www.kellysearch.co.uk /gb-product-34990.html   (1194 words)

  
 Antics, Free Flight & Kites, Kites
Brookite Delta Kite No 1 Traditional Kite 166 x 91mm (Delta #1)
Speedy but easy to control, this one is ideal for the beginner.
Brookite Cutter No 5 Traditional Kite 93 x 73mm (Cutter #5)
www.anticsonline.co.uk /x665_1.html   (292 words)

  
 Antics, Free Flight & Kites, Kites
Based on the popular stunt kite, this new range of Flying Flags presents the opportunity for great fun and the ability to perform all sorts of stunts in the sky.
A low priced but very speedy kite, bringing the experience of Sport Kite flying within the budget of many more enthusiasts and ideal for anyone wanting to learn the more challenging aspects of kite flying.
Simplicity of design with no assembly required, the Sled Kite is easy to fly and gives instant access to the skies.
www.anticsonline.co.uk /665_1.html   (1187 words)

  
 wales & n. ireland minerals
Another location fitting this bill is the brookite locality of Fron Oleu, (also the type locality), which along with a few other sites in the Snowdonia district of north Wales, has produced Alpine-vein type minerals.
Brookite from here is of the finest for the species in the best specimens.
Quartz and anatase are also worth mentioning and are associated with the brookite.
www.curriehj.freeserve.co.uk /walesni.htm   (613 words)

  
 Ceramic Material: Titanium Dioxide Anatase, Brookite
Rutile ore and titanium slag obtained from the electric furnace melting of titaniferous iron ore also are starting materials.
Titanium is also made from anatase and brookite, natural TiO2 ores.
It is an abundant in the sense that it occurs in many silicates in nature, accounting for over 1% of the earth's crust.
ceramic-materials.com /cermat/material/1644.html   (861 words)

  
 Brookite - Jungle Rider Lion Hobby Horse LION01   (Site not responding. Last check: 2007-10-29)
Brookite - Jungle Rider Lion Hobby Horse LION01
Mail Order Express has made it easy to buy BROOKITE products securely on-line, with each brand/range broken down individually and options to sort by price, age and number of items per page, things couldn't be easier!!
This is just one of many BROOKITE products we have available at Mail Order Express.
www.mailorderexpress.com /LION01_Brookite_Jungle_Rider_Lion_Hobby_Horse.asp   (182 words)

  
 Mineral Shows - Trinity Mineral Co
Scott Werschky of Miner's Lunchobox had the best value in these new brookite specimens from Pakistan.
Prices for these are all over the map but Scott's had the highest quality for the buck of any that I saw at the show.
Brookite is a simple oxide of titanium and it shares identical chemistry with rutile and anatase - TiO2.
www.mineralshows.com /denver2004/specials.shtml   (1483 words)

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