| Segnitite Mineral Data |
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- 42.7.4.1 Arsenocrandallite (Ca,Sr)Al3[(As,P)O4]2(OH)5·(H2O) R 3m 3m
- 42.7.4.2 Philipsbornite PbAl3(AsO4)2(OH)5·(H2O) R 3m-,R 3m Trig
- 42.7.4.3 Arsenogoyazite (Sr,Ca,Ba)Al3(AsO4,PO4)2(OH,F)5·(H2O) R 3m 3 2/m
- 42.7.4.4 Segnitite PbFe3H(AsO4)2(OH)6 R 3m 3 2/m
- VIII/B.36-10 Soddyite (UO2)2SiO4·2(H2O) F ddd 2/m 2/m 2/m
- VIII/B.36-20 Swamboite UH6(UO2)6(SiO4)6·30(H2O) P 21/a 2/m
- VIII/B.36-163 Kintoreite PbFe3(PO4)2(OH,H2O)6 R 3m 3 2/m
- VIII/B.36-165 Segnitite PbFe3H(AsO4)2(OH)6 R 3m 3 2/m
General Segnitite Information |
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 Chemical Formula: |
PbFe+++3H(AsO4)2(OH)6 | ||
| Composition: |
Molecular Weight = 755.63 gm | ||
| Iron 22.17 % Fe 31.70 % Fe2O3 | |||
| Arsenic 19.83 % As 30.42 % As2O5 | |||
| Hydrogen 0.93 % H 8.34 % H2O | |||
| Lead 27.42 % Pb 29.54 % PbO | |||
| Oxygen 29.64 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
PbFe3+3H(AsO4)2(OH)6 | ||
| IMA Status: |
Approved IMA 1992 | ||
| Locality: |
Link to MinDat.org Location Data. | ||
| Synonym: |
ICSD 40681 | ||
| IMA1991-017 | |||
| PDF 45-1392 | |||
Segnitite Image | |||
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Images:
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Segnitite Crystallography |
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| Axial Ratios: |
a:c = 1:2.32545 | ||
| Cell Dimensions: |
a = 7.359, c = 17.113, Z = 3; V = 802.59 Den(Calc)= 4.69 | ||
| Crystal System: |
Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.092(1), 5.966(0.5), 3.678(0.4), | ||
Physical Properties of Segnitite |
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| Cleavage: |
[???] Good | ||
| Color: |
Greenish brown, Yellow brown. | ||
| Diaphaniety: |
Transparent to Translucent | ||
| Hardness: |
4 - Fluorite | ||
| Luster: |
Adamantine | ||
| Streak: |
light yellow | ||
Optical Properties of Segnitite |
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| Gladstone-Dale: |
CI calc= 0.051 (Good) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2058,KC= 0.2168 |
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| Optical Data: |
Uniaxial (-), e=1.955, w=1.975, bire=0.0200. | ||
Calculated Properties of Segnitite |
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| Electron Density: |
relectron=4.28 gm/cc |
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| Fermion Index |
Fermion Index = 0.06544 Boson Index = 0.93456 |
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| Photoelectric: |
PESegnitite = 482.13 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Segnitite is Not Radioactive |
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Segnitite Classification |
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| Dana Class: |
42.7.4.4 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen | ||
| (42.7)where (AB)5 (XO4)3 Zq · x(H2O) | |||
| (42.7.4)Dana Group | |||
| Strunz Class: |
VIII/B.36-165 VIII - Silicates | ||
| VIII/B - Nesosub-silicates. "Insel" silicates with anions unfamiliar to tetraheders. Uranyl-"Insel" silicates with [UO2]2+ - [SiO4]4- | |||
| VIII/B.36 - Soddyite - Swamboite series | |||
Other Segnitite Information |
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| References: |
PHYS. PROP.(Am.Min.,Vol.77,p656-659,1992) OPTIC PROP.(Am.Min.,Vol.77,p656-659,1992) | ||
| See Also: |
Links to other databases for Segnitite : 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 -École des Mines de Paris Search for Segnitite using: Visit our Advertisers for Segnitite : Translate Segnitite Mineral Data : Ask about Segnitite here : Print or Cut-and-Paste your Segnitite Specimen Label here :
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