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Stewartite Mineral Data

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General Stewartite Information

Help on Chemical  Formula: Chemical Formula: Mn++Fe+++2(PO4)2(OH)2•8(H2O)
Help on Composition: Composition: Molecular Weight = 534.71 gm
   Manganese   10.27 %  Mn   13.27 % MnO
   Iron        20.89 %  Fe   29.87 % Fe2O3
   Phosphorus  11.59 %  P    26.55 % P2O5
   Hydrogen     3.39 %  H    30.32 % H2O
   Oxygen      53.86 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+Fe3+2(PO4)2(OH)2•8(H2O)
Help on Environment: Environment: Granitic lithia-bearing pegmatites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1912
Help on Locality: Locality: Stuart mine, Queen Mountains, Pala, San Diego Co., California. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after it's locality.
Help on Name Pronunciation: Name Pronunciation: Stewartite + Pronunciation Say STEWARTITE
Help on Synonym: Synonym: ICSD 6204
  PDF 5-110
 

Stewartite Image

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  Stewartite   Rockbridgeite

Comments: Pointed, brownish yellow stewartite crystals on massive, dark rockbridgeite.
Location: Hagendorf, Bavaria, Germany. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Stewartite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9743:1:0.6768
Help on Cell Dimensions: Cell Dimensions: a = 10.398, b = 10.672, c = 7.223, Z = 2; alpha = 90.1°, beta = 109.1°, gamma = 71.83° V = 719.63 Den(Calc)= 2.47
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.98(1), 2.99(0.4), 3.93(0.4),
 

Physical Properties of Stewartite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Brownish yellow, Yellow, Orange.
Help on Density: Density: 2.94
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Habit: Habit: Cryptocrystalline - Occurs as crystals too small to distinguish with the naked eye.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Hardness: Hardness: 3 - Calcite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Streak: Streak: white
 

Optical Properties of Stewartite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.188 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.037 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2617,KPDmeas= 0.2207,KC= 0.2719
Ncalc = 1.67 - 1.8
Help on Optical Data: Optical Data: Biaxial (-), a=1.612-1.63, b=1.653-1.658, g=1.66-1.681, bire=0.0480-0.0510
 

Calculated Properties of Stewartite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.50 gm/cc
note: Specific Gravity of Stewartite =2.48 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0046920033
Boson Index = 0.9953079967
Help on Photoelectric: Photoelectric: PEStewartite = 9.22 barns/electron
U=PEStewartite x rElectron Density= 23.01 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Stewartite is Not Radioactive
 

Stewartite Classification

Help on  Dana Class: Dana Class: 42.11.10.02 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.11)where (AB)4 (XO4)3 Zq � x(H2O)
  (42.11.10)Laueite Group
 
42.11.10.01 Laueite MnFe2(PO4)2(OH)2•8(H2O) P1 1
 
42.11.10.02 Stewartite MnFe2(PO4)2(OH)2•8(H2O) P1 1
 
42.11.10.03 Pseudolaueite MnFe2(PO4)2(OH)2•7-8(H2O) P 21/a 2/m
 
42.11.10.04 Ushkovite MgFe2(PO4)2(OH)2•8(H2O) P1 1
 
42.11.10.05 Ferrolaueite! FeFe2(PO4)2(OH)2•8(H2O) Tri
Help on  Strunz Class: Strunz Class: 08.DC.30 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DC -With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
 
08.DC.30 Gordonite MgAl2(PO4)2(OH)2•8(H2O) P1 1
 
08.DC.30 Ferrolaueite! FeFe2(PO4)2(OH)2•8(H2O) Tri
 
08.DC.30 Mangangordonite (Mn,Fe,Mg)Al2(PO4)2(OH)2•8(H2O) P1 1
 
08.DC.30 Laueite MnFe2(PO4)2(OH)2•8(H2O) P1 1
 
08.DC.30 Sigloite FeAl2(PO4)2(OH)3•5(H2O) P1 1
 
08.DC.30 Pseudolaueite MnFe2(PO4)2(OH)2•7-8(H2O) P 21/a 2/m
 
08.DC.30 Paravauxite FeAl2(PO4)2(OH)2•8(H2O) P1 1
 
08.DC.30 Stewartite MnFe2(PO4)2(OH)2•8(H2O) P1 1
 
08.DC.30 Ushkovite MgFe2(PO4)2(OH)2•8(H2O) P1 1
 
08.DC.30 Kastningite! (Mn,Fe,Mg)Al2(PO4)2(OH)2•8(H2O) P1 1
 
08.DC.30 Maghrebite! MgAl2(AsO4)2(OH)2•8H2O P1 1
 

Other Stewartite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Stewartite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Stewartite

Mn++Fe+++2(PO4)2(OH)2•8(H2O)
Dana No: 42.11.10.02 Strunz No: 08.DC.30
Locality:

 

Notes:

 

 
   
 


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