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Brookite Mineral Data + |
General Brookite Information |
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| TiO2 | |||
| Molecular Weight = 79.88 gm | |||
| Titanium 59.94 % Ti 100.00 % TiO2 | |||
| Oxygen 40.06 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| TiO2 | |||
| Valid Species (Pre-IMA) 1825 | |||
| Magnet Cove near Hot Springs, Arkansas, USA. Link to MinDat.org Location Data. | |||
| Named after the English mineralogist, Henry James Brucke (1771-1857), a London mineralogist and wool trader. | |||
| ICSD 36408 | |||
| PDF 29-1360 | |||
Brookite Image | |||
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Brookite Crystallography |
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| a:b:c =0.5942:1:0.5601 | |||
| a = 5.456, b = 9.182, c = 5.143, Z = 8; V = 257.65 Den(Calc)= 4.12 | |||
| Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pcab | |||
| By Intensity(I/Io): 3.51(1), 2.9(0.9), 3.47(0.8), | |||
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Physical Properties of Brookite |
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| [120] Indistinct | |||
| Brown, Light brown, Dark brown, Dark reddish brown, Orange. | |||
| 4.1 - 4.14, Average = 4.11 | |||
| Transparent to translucent to opaque | |||
| Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces. | |||
| Platy - Sheet forms (e.g. micas). | |||
| Tabular - Form dimensions are thin in one direction. | |||
| 5.5-6 - Knife Blade-Orthoclase | |||
| None. | |||
| Sub Metallic | |||
| yellowish white | |||
Optical Properties of Brookite |
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| CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= -0.007 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.3958,KPDmeas= 0.3958,KC= 0.393 |
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| Biaxial (+), a=2.583-2.584, b=2.584-2.588, g=2.705-2.741, bire=0.1220-0.1570, 2V(Calc)=12-20, 2V(Meas)=10. Dispersion relatively strong. | |||
Calculated Properties of Brookite |
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relectron=3.92 gm/cc |
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| Fermion Index = 0.07769 Boson Index = 0.92231 |
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PEBrookite = 10.03 barns/electron |
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| GRapi = 0 (Gamma Ray American Petroleum Institute Units) Brookite is Not Radioactive |
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Brookite Classification |
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| 4.4.5.1 (4)Simple Oxides | |||
| (4.4)with a cation charge of 4+ (A++++ O2) | |||
| (4.4.5)Dana Group | |||
| IV/D.15-10 IV - Oxides | |||
| IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds) | |||
| IV/D.15 - Brookite - Kuranakhite series | |||
Other Brookite Information |
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| NAME( Lapis) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) | |||
| Links to other databases for Brookite : 1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 - Applied Mineralogy 6 -Athena 7 - Crocoite.com Mineral Locations 8 - EUROmin Project 9 - Franklin Minerals(Dunn) 10 -Google Images 11 -Google Scholar 12 -Handbook of Mineralogy (UofA) 13 - HyperPhysics 14 -MinDAT 15 -MinMax(Deutsch) 16 -MinMax(English) 17 -Mineralienatlas (Deutsch) 18 - Minerals of Wisconsin 19 - Philatelic Mineralogy 20 -QUT Mineral Atlas 21 - Scandinavian mineral gallery 22 -University of Colorado - Mineral Structure Data 23 - WWW-MINCRYST 24 -École des Mines de Paris Search for Brookite using: Visit our Advertisers for Brookite : Translate Brookite Mineral Data : Ask about Brookite here : Print or Cut-and-Paste your Brookite Specimen Label here :
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