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Simpsonite Mineral Data + |
General Simpsonite Information |
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| Al4(Ta,Nb)3O13(OH) | |||
| Molecular Weight = 813.65 gm | |||
| Tantalum 53.37 % Ta 65.17 % Ta2O5 | |||
| Niobium 5.71 % Nb 8.17 % Nb2O5 | |||
| Aluminum 13.26 % Al 25.06 % Al2O3 | |||
| Hydrogen 0.12 % H 1.11 % H2O | |||
| Oxygen 27.53 % O | |||
| ______ ______ | |||
| 100.00 % 99.51 % = TOTAL OXIDE | |||
| Al4Ta2.4Nb0.5O13(OH) | |||
| Accessory mineral in some tantalum-rich granite pegmatites. | |||
| Valid Species (Pre-IMA) 1938 | |||
| Tabba Tabba, Western Australia. Link to MinDat.org Location Data. | |||
| Named for Edward Sydney Simpson (1875-1939), Western Australian government mineralogis and mineral analyst. | |||
| ICSD 67673 | |||
| PDF 15-705 | |||
Simpsonite Image | |||
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Simpsonite Crystallography |
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| a:c = 1:0.6119 | |||
| a = 7.377, c = 4.514, Z = 1; V = 212.74 Den(Calc)= 6.35 | |||
| Trigonal - PyramidalH-M Symbol (3) Space Group: P 3 | |||
| By Intensity(I/Io): 1.64(1), 1.39(0.95), 2.84(0.85), | |||
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Mouse |
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Physical Properties of Simpsonite |
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| None | |||
| Brownish yellow, Colorless, White, Light brown, Light yellow. | |||
| 6.7 | |||
| Transparent | |||
| Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. | |||
| Euhedral Crystals - Occurs as well-formed crystals showing good external form. | |||
| Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). | |||
| Striated - Parallel lines on crystal surface or cleavage face. | |||
| 7-7.5 - Quartz-Garnet | |||
| Fluorescent. | |||
| Vitreous - Adamantine | |||
| white | |||
Optical Properties of Simpsonite |
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| colorless. | |||
| colorless. | |||
| CI meas= 0.122 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= 0.074 (Fair) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.163,KPDmeas= 0.1545,KC= 0.1759 |
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| Uniaxial (-), e=2.025, w=2.045, bire=0.0200. | |||
Calculated Properties of Simpsonite |
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relectron=5.63 gm/cc |
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| Fermion Index = 0.00019 Boson Index = 0.99981 |
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PESimpsonite = 629.45 barns/electron |
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| GRapi = 0 (Gamma Ray American Petroleum Institute Units) Simpsonite is Not Radioactive |
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Simpsonite Classification |
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| 8.7.5.1 (8)Multiple Oxides with Nb, Ta, and Ti | |||
| (8.7)Dana Type | |||
| (8.7.5)Dana Group | |||
| IV/D.27-20 IV - Oxides | |||
| IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds) | |||
| IV/D.27 - Bahianite - Sosedkoite series | |||
Other Simpsonite Information |
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| NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3) | |||
| Links to other databases for Simpsonite : 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 (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris Search for Simpsonite using: Visit our Advertisers for Simpsonite : AA Mineral SpecimensB & L Fine Minerals Crystal Vaults Dan Weinrich Fine Minerals Dan Weinrich Auctions e-Rocks 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 Rockshop.cz T G Fine Minerals Wrights Rock Shop Translate Simpsonite Mineral Data : Ask about Simpsonite here : Print or Cut-and-Paste your Simpsonite Specimen Label here :
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