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Holtite Mineral Data + |
General Holtite Information |
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| Al6(Al,Ta)(BO3)[(SiO4,SbO4,AsO4)]3(O,OH)3 | |||
| Molecular Weight = 2,589.58 gm | |||
| Tantalum 10.48 % Ta 12.80 % Ta2O5 | |||
| Aluminum 24.17 % Al 45.67 % Al2O3 | |||
| Iron 0.22 % Fe 0.28 % FeO | |||
| Silicon 11.50 % Si 24.59 % SiO2 | |||
| Boron 1.59 % B 5.11 % B2O3 | |||
| Antimony 5.64 % Sb 7.50 % Sb2O5 | |||
| Arsenic 2.03 % As 3.11 % As2O5 | |||
| Hydrogen 0.08 % H 0.73 % H2O | |||
| Oxygen 44.30 % O | |||
| ______ ______ | |||
| 100.00 % 99.78 % = TOTAL OXIDE | |||
| Al23.2Ta1.5Fe2+0.1B3.8Si10.6Sb1.2As0.7O69.6(OH)2.1 | |||
| As coatings on stibiotantalite and replacing tantalite in a pegmatite. | |||
| Approved IMA 1971 | |||
| At Bunbury Gully, Greenbushes, Western Australia. Link to MinDat.org Location Data. | |||
| Named for Harold Edward Holt (1908-1967), Prime minister of Australia (1966-1967). | |||
| ICSD 66143 | |||
| PDF 25-1209 | |||
Holtite Image | |||
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Holtite Crystallography |
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| a:b:c =0.3943:1:1.7134 | |||
| a = 4.6914, b = 11.896, c = 20.383, Z = 1; V = 1,137.55 Den(Calc)= 3.78 | |||
| Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma | |||
| By Intensity(I/Io): 10.28(1), 2.94(0.4), 5.89(0.34), | |||
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Mouse |
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Physical Properties of Holtite |
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| [001] Distinct | |||
| Beige white, Brown, Greenish, Greenish brown, Light brown white. | |||
| 3.6 - 3.9, Average = 3.75 | |||
| Semitransparent | |||
| Blocky - Crystal shape tends to be equant (e.g. feldspars). | |||
| Pseudo Hexagonal - Crystals show a hexagonal outline. | |||
| 8.5 - Chrysoberyl | |||
| Fluorescent, Short UV=bright yellow, Long UV=dull orange. | |||
| Vitreous - Resinous | |||
| white | |||
Optical Properties of Holtite |
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| CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.001 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1953,KPDmeas= 0.1968,KC= 0.1955 |
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| Biaxial (-), a=1.705-1.746, b=1.728-1.759, g=1.73-1.761, bire=0.0150-0.0250, 2V(Calc)=32-42, 2V(Meas)=20-55. Dispersion r < v. | |||
| colorless. | |||
| colorless. | |||
| yellow. | |||
Calculated Properties of Holtite |
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relectron=3.62 gm/cc |
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| Fermion Index = 0.00879 Boson Index = 0.99121 |
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PEHoltite = 132.55 barns/electron |
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| GRapi = 0 (Gamma Ray American Petroleum Institute Units) Holtite is Not Radioactive |
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Holtite Classification |
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| 54.1.3.1 (54)Nesosilicate Borosilicates and Some Beryllosilicates | |||
| (54.1)with (BO3) | |||
| (54.1.3)Dana Group | |||
| VIII/B.31-30 VIII - Silicates | |||
| VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, with beryllium and boron | |||
| VIII/B.31 - Kornerupine - Harkerite series | |||
Other Holtite Information |
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| NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2) | |||
| Links to other databases for Holtite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (MinSocAm) 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 -QUT Mineral Atlas 14 - WWW-MINCRYST 15 -École des Mines de Paris Search for Holtite using: Visit our Advertisers for Holtite : Translate Holtite Mineral Data : Ask about Holtite here : Print or Cut-and-Paste your Holtite Specimen Label here :
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