Stewartite Mineral Data

General Stewartite Information

Chemical Formula:

Mn++Fe+++2(PO4)2(OH)2•8(H2O)

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

Empirical Formula:

Mn²⁺Fe³⁺₂(PO₄)₂(OH)₂•8(H₂O)

Environment:

Granitic lithia-bearing pegmatites.

IMA Status:

Valid Species (Pre-IMA) 1912

Locality:

Stuart mine, Queen Mountains, Pala, San Diego Co., California. Link to MinDat.org Location Data.

Name Origin:

Named after it's locality.

Name Pronunciation:

Stewartite + Pronunciation

Synonym:

ICSD 6204

PDF 5-110

Stewartite Image

Images:

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

Axial Ratios:

a:b:c =0.9743:1:0.6768

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

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 9.98(1), 2.99(0.4), 3.93(0.4),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Moore P B , Araki T , American Mineralogist , 59 (1974) p.1272-1276, Stewartite, MnFe2(OH)2(H2O)6[PO4]2.2H2O: Its atomic arrangement

Physical Properties of Stewartite

Cleavage:

{???} Good

Color:

Brownish yellow, Yellow, Orange.

Density:

2.94

Diaphaneity:

Transparent to translucent

Habit:

Cryptocrystalline - Occurs as crystals too small to distinguish with the naked eye.

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

3 - Calcite

Luminescence:

Non-fluorescent.

Streak:

white

Optical Properties of Stewartite

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

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

Electron Density:

Bulk Density (Electron Density)=2.50 gm/cc
note: Specific Gravity of Stewartite =2.48 gm/cc.

Fermion Index:

Fermion Index = 0.0046920033
Boson Index = 0.9953079967

Photoelectric:

PE_Stewartite= 9.22 barns/electron
U=PE_Stewartite x rElectron Density= 23.01 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Stewartite is Not Radioactive

Stewartite Classification

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

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

References:

NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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

Search for Stewartite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Stewartite :

A Bijoux Google Search for Stewartite
Adam's Minerals Google Search for Stewartite
Cape Minerals Google Search for Stewartite
Dakota Matrix Minerals Google Search for Stewartite
Excalibur Mineral Corp. Google Search for Stewartite
Exceptional Minerals Google Search for Stewartite
John Betts Fine Minerals Search for Stewartite
McDougall Minerals Google Search for Stewartite
Mineral News Website Link
Rock and Mineral Shows Google Search for Stewartite
Weinrich Minerals, Inc. Google Search for Stewartite

Ask about Stewartite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: