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Strengite Mineral Data |
General Strengite Information |
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Fe+++PO4•2(H2O) | ||
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Molecular Weight = 186.85 gm | ||
Iron 29.89 % Fe 42.73 % Fe2O3 | |||
Phosphorus 16.58 % P 37.98 % P2O5 | |||
Hydrogen 2.16 % H 19.28 % H2O | |||
Oxygen 51.38 % O | |||
______ ______ | |||
100.00 % 100.00 % = TOTAL OXIDE | |||
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Fe3+(PO4)•2(H2O) | ||
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Alteration of iron-bearing phosphates. Forms a series with variscite. | ||
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Valid Species (Pre-IMA) 1877 | ||
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Eleonore iron mine, Giessen, near Waldgirmes, Thuringia, Germany Link to MinDat.org Location Data. | ||
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Named after Johann August Streng (1830-1897), German mineralogist, University of Giessen, Germany. | ||
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Strengite + Pronunciation ![]() |
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Barrandite | ||
Globosite | |||
Strengite Image | |||
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Strengite Crystallography |
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a:b:c =1.0238:1:0.8823 | ||
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a = 10.122, b = 9.886, c = 8.7233, Z = 8; V = 872.91 Den(Calc)= 2.84 | ||
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Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pcab | ||
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By Intensity(I/Io): 3.114(1), 4.383(0.85), 5.509(0.6), | ||
Physical Properties of Strengite |
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{010} Good, {001} Poor | ||
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Colorless, Pale violet, Deep violet, Red, Carmine red. | ||
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2.87 | ||
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Transparent to Translucent | ||
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Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. | ||
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Botryoidal - "Grape-like" rounded forms (e.g.. malachite). | ||
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Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite) | ||
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Spherical - Spherical, rounded aggregates. | ||
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3.5 - Copper Penny | ||
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Non-fluorescent. | ||
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Vitreous (Glassy) | ||
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white | ||
Optical Properties of Strengite |
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CI meas= 0.048 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.038 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2594,KPDmeas= 0.2567,KC= 0.2697 Ncalc = 1.77 |
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Biaxial (+/-), a=1.71-1.74, b=1.72-1.75, g=1.74-1.76, bire=0.0200-0.0300, 2V(Calc)=72-88, 2V(Meas)=0-90. Dispersion relatively strong. | ||
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none. | ||
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none. | ||
Calculated Properties of Strengite |
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Bulk Density (Electron Density)=2.83 gm/cc note: Specific Gravity of Strengite =2.84 gm/cc. |
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Fermion Index = 0.0065862806 Boson Index = 0.9934137194 |
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PEStrengite = 9.60 barns/electron U=PEStrengite x rElectron Density= 27.13 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Strengite is Not Radioactive |
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Strengite Classification |
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40.04.01.02 (40)Hydrated Phosphates, etc | ||
(40.04)where A+++ XO4 � x(H2O) | |||
(40.04.01)Variscite Group | |||
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08.CD.10 08 - PHOSPHATES, ARSENATES, VANADATES | ||
08.C - Phosphates without Additional Anions, with H2O | |||
08.CD -With only medium-sized cations, RO4:H2O = 1:2 | |||
Other Strengite Information |
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Links to other databases for Strengite : 1 - Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Athena 4 - EUROmin Project 5 - Ecole des Mines de Paris 6 - GeoScienceWorld 7 - Google Images 8 - Google Scholar 9 - Handbook of Mineralogy (MinSocAm) 10 - Handbook of Mineralogy (UofA) 11 - MinDAT 12 - Mineralienatlas (Deutsch) 13 - Online Mineral Museum 14 - QUT Mineral Atlas 15 - Ruff.Info 16 - WWW-MINCRYST Search for Strengite using: Visit our Advertisers for Strengite : Ask about Strengite here : Print or Cut-and-Paste your Strengite Specimen Label here :
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