Mineralogy Database

Strengite Mineral Data

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General Strengite Information

Help on Chemical  Formula: Chemical Formula: Fe+++PO4•2(H2O)
Help on Composition: Composition: 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
Help on Empirical Formula: Empirical Formula: Fe3+(PO4)•2(H2O)
Help on Environment: Environment: Alteration of iron-bearing phosphates. Forms a series with variscite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1877
Help on Locality: Locality: Eleonore iron mine, Giessen, near Waldgirmes, Thuringia, Germany Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Johann August Streng (1830-1897), German mineralogist, University of Giessen, Germany.
Help on Name Pronunciation: Name Pronunciation: Strengite + Pronunciation Say STRENGITE
Help on Synonym: Synonym: Barrandite
  Globosite
 

Strengite Image

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  Strengite

Comments: Pink, bladed, stellate spray of strengite crystals on matrix.
Location: Indian Mountain, Cherokee County, Alabama, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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  Strengite   Cacoxenite

Comments: Lilac colored, spear-head shape crystals of strengite to 5mm in large, open vug associated with golden fibrous cacoxenite.
Location: Coon Creek, Polk Co., Arkansas, USA. Scale: Picture size 2 cm.
© Tom Loomis / Dakota Matrix

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  Strengite   Kidwellite

Comments: Spherical, crystalline aggregate of purple strengite on green kidwellite.
Location: Three Oak Gap, Polk Co., Arkansas, USA. Scale: Crystal size 2 mm.
© Tom Loomis / Dakota Matrix

Strengite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0238:1:0.8823
Help on Cell Dimensions: Cell Dimensions: a = 10.122, b = 9.886, c = 8.7233, Z = 8; V = 872.91 Den(Calc)= 2.84
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pcab
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.114(1), 4.383(0.85), 5.509(0.6),
 

Physical Properties of Strengite

Help on Cleavage: Cleavage: {010} Good, {001} Poor
Help on Color: Color: Colorless, Pale violet, Deep violet, Red, Carmine red.
Help on Density: Density: 2.87
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Botryoidal - "Grape-like" rounded forms (e.g.. malachite).
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Strengite

Help on Gladstone-Dale: Gladstone-Dale: 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
Help on Optical Data: Optical Data: 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.
Help on Pleochroism (x): Pleochroism (x): none.
Help on Pleochroism (y): Pleochroism (y): none.
 

Calculated Properties of Strengite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.83 gm/cc
note: Specific Gravity of Strengite =2.84 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0065862806
Boson Index = 0.9934137194
Help on Photoelectric: Photoelectric: PEStrengite = 9.60 barns/electron
U=PEStrengite x rElectron Density= 27.13 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Strengite is Not Radioactive
 

Strengite Classification

Help on  Dana Class: Dana Class: 40.04.01.02 (40)Hydrated Phosphates, etc
  (40.04)where A+++ XO4 � x(H2O)
  (40.04.01)Variscite Group
 
40.04.01.01 Variscite AlPO4•2(H2O) Pcab 2/m 2/m 2/m
 
40.04.01.02 Strengite FePO4•2(H2O) Pcab 2/m 2/m 2/m
 
40.04.01.03 Scorodite FeAsO4•2(H2O) Pcab 2/m 2/m 2/m
 
40.04.01.04 Mansfieldite AlAsO4•2(H2O) Pcab 2/m 2/m 2/m
 
40.04.01.05 Yanomamite In(AsO4)•2(H2O) P bca 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 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
 
08.CD.10 Strengite FePO4•2(H2O) Pcab 2/m 2/m 2/m
 
08.CD.10 Mansfieldite AlAsO4•2(H2O) Pcab 2/m 2/m 2/m
 
08.CD.10 Variscite AlPO4•2(H2O) Pcab 2/m 2/m 2/m
 
08.CD.10 Scorodite FeAsO4•2(H2O) Pcab 2/m 2/m 2/m
 
08.CD.10 Yanomamite In(AsO4)•2(H2O) P bca 2/m 2/m 2/m
 

Other Strengite Information

Help on See Also: See Also: 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

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Print or Cut-and-Paste your Strengite Specimen Label here :

Strengite

Fe+++PO4•2(H2O)
Dana No: 40.04.01.02 Strunz No: 08.CD.10
Locality:

 

Notes:

 

 


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