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Gibbsite Mineral Data + |
General Gibbsite Information |
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| Al(OH)3 | |||
| Molecular Weight = 78.00 gm | |||
| Aluminum 34.59 % Al 65.36 % Al2O3 | |||
| Hydrogen 3.88 % H 34.64 % H2O | |||
| Oxygen 61.53 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Al(OH)3 | |||
| Lateritic soils developed on aluminous rocks in areas of high rainfall. | |||
| Valid Species (Pre-IMA) 1822 | |||
| Bauxite deposits of Arkansas, USA. Link to MinDat.org Location Data. | |||
| Named after the American collector, G. Gibbs (1776-1833). | |||
| Hydrargyllite | |||
| ICSD 36233 | |||
| PDF 33-18 | |||
Gibbsite Image | |||
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Gibbsite Crystallography |
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| a:b:c =1.7043:1:1.9169 | |||
| a = 8.641, b = 5.07, c = 9.719, Z = 8; beta = 94.566° V = 424.44 Den(Calc)= 2.44 | |||
| Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/n | |||
| By Intensity(I/Io): 4.82(1), 4.34(0.4), 4.3(0.2), | |||
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Physical Properties of Gibbsite |
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| [001] Perfect | |||
| Bluish, Green, Green white, Gray, Gray white. | |||
| 2.3 - 2.4, Average = 2.34 | |||
| Translucent to transparent | |||
| Tough - Difficult to break apart as shown by fibrous minerals and most metals. | |||
| Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite). | |||
| Spherical - Spherical, rounded aggregates. | |||
| Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite). | |||
| 2.5-3 - Finger Nail-Calcite | |||
| None. | |||
| Vitreous - Pearly | |||
| white | |||
Optical Properties of Gibbsite |
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| CI meas= 0.033 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.069 (Fair) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2356,KPDmeas= 0.2446,KC= 0.2531 |
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| Biaxial (+), a=1.568-1.57, b=1.568-1.57, g=1.586-1.587, bire=0.0170-0.0180, 2V(Calc)=0, 2V(Meas)=0-5. Dispersion r > v or r < v. | |||
| colorless. | |||
| colorless. | |||
| colorless. | |||
Calculated Properties of Gibbsite |
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relectron=2.41 gm/cc |
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| Fermion Index = 0.0003 Boson Index = 0.9997 |
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PEGibbsite = 1.10 barns/electron |
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| GRapi = 0 (Gamma Ray American Petroleum Institute Units) Gibbsite is Not Radioactive |
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Gibbsite Classification |
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| 6.3.1.1 (6)Hydroxides and Oxides Containing Hydroxyl | |||
| (6.3)with (OH)3 or (OH)6 groups | |||
| (6.3.1)Dana Group | |||
| IV/F.02-10 IV - Oxides | |||
| IV/F - Hydroxides and oxidic hydrates, water-bearing oxides with layered structure | |||
| IV/F.02 - Gibbsite - Doyleite series | |||
Other Gibbsite Information |
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| NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65) | |||
| Links to other databases for Gibbsite : 1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 - Am. Min. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 - Athena 6 - EUROmin Project 7 - Ecole des Mines de Paris 8 - Google Images 9 - Google Scholar 10 - Handbook of Mineralogy (MinSocAm) 11 - Handbook of Mineralogy (UofA) 12 - MinDAT 13 - MinMax(Deutsch) 14 - MinMax(English) 15 - Mineralienatlas (Deutsch) 16 - QUT Mineral Atlas 17 - Ruff.Info 18 - University of Colorado - Mineral Structure Data 19 - WWW-MINCRYST Search for Gibbsite using: Visit our Advertisers for Gibbsite : AA Mineral SpecimensB & L Fine Minerals Dan Weinrich Fine Minerals Dan Weinrich Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals The GeoZone Wrights Rock Shop Translate Gibbsite Mineral Data : Ask about Gibbsite here : Print or Cut-and-Paste your Gibbsite Specimen Label here :
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