Mineralogy Database

Sturmanite Mineral Data

Search Webmineral :
  
Advertisment

General Sturmanite Information

Help on Chemical  Formula: Chemical Formula: Ca6(Fe+++,Al,Mn++)2(SO4)2[B(OH)4](OH)12•25(H2O)
Help on Composition: Composition: Molecular Weight = 1,265.59 gm
   Calcium    19.00 %  Ca   26.59 % CaO
   Manganese   1.30 %  Mn    1.68 % MnO
   Aluminum    1.28 %  Al    2.42 % Al2O3
   Iron        5.30 %  Fe    7.57 % Fe2O3
   Boron       0.85 %  B     2.75 % B2O3
   Hydrogen    5.26 %  H    46.97 % H2O
   Sulfur      5.07 %  S    12.65 % SO3
   Oxygen     61.95 %  O
             ______        ______ 
             100.00 %      100.63 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca6Fe3+1.2Al0.6Mn2+0.3(SO4)2B(OH)16�25(H2O)
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: Black Rock mine, Kuruman district, Cape Province, South Africa. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for B. Darko Sturman (1937-), Canadian mineralogist, Royal Ontario Museum, Toronto, Canada.
Help on Name Pronunciation: Name Pronunciation: Sturmanite + Pronunciation Say STURMANITE
Help on Synonym: Synonym: IMA1981-011
 

Sturmanite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image

  Sturmanite

Comments: Sharply terminated dark yellowish crystal of sturmanite with a few lesser crystals attached to one side.
Location: N'Chwaning mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 17 x 10 x 16 mm.
© Dan Weinrich

Sturmanite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.9525
Help on Cell Dimensions: Cell Dimensions: a = 11.16, c = 21.79, Z = 2; V = 2,350.26 Den(Calc)= 1.79
Help on Crystal System: Crystal System: Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: P 31c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.67(1), 3.89(0.7), 5.58(0.7),
 

Physical Properties of Sturmanite

Help on Cleavage: Cleavage: {1010} Perfect
Help on Color: Color: Greenish yellow, Yellow, Yellow green, Orange brown.
Help on Density: Density: 1.847
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Hexagonal - Six-sided crystal shape in cross-section or habit.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Pyramidal - Crystals are shaped like pyramids.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: yellow white
 

Optical Properties of Sturmanite

Help on Dichroism (e): Dichroism (e): pale green.
Help on Dichroism (w): Dichroism (w): pale yellowish green.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2807,KPDmeas= 0.2721,KC= 0.276
Ncalc = 1.49 - 1.51
Help on Optical Data: Optical Data: Uniaxial (+), w=1.5, e=1.505, bire=0.0050.
 

Calculated Properties of Sturmanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.93 gm/cc
note: Specific Gravity of Sturmanite =1.85 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0037641249
Boson Index = 0.9962358751
Help on Photoelectric: Photoelectric: PESturmanite = 4.51 barns/electron
U=PESturmanite x rElectron Density= 8.72 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sturmanite is Not Radioactive
 

Sturmanite Classification

Help on  Dana Class: Dana Class: 32.04.04.02 (32)Compound Sulfates
  (32.04)(hydrous) with poly-anionic formula
  (32.04.04)Charlesite Group
 
32.04.04.01 Charlesite Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O) P 31c 3m
 
32.04.04.02 Sturmanite Ca6(Fe,Al,Mn)2(SO4)2[B(OH)4](OH)12•25(H2O) P 31c 3m
 
32.04.04.03 Jouravskite Ca3Mn(SO4,CO3)2(OH)6•12(H2O) P 63/m 6/m
 
32.04.04.04 Thaumasite Ca3Si(CO3)(SO4)(OH)6•12(H2O) P 63/m 6/m
 
32.04.04.05 Carraraite! Ca3Ge(OH)6(SO4)(CO3)•12H2O P 63/m, or P 63 Hex
Help on  Strunz Class: Strunz Class: 07.DG.15 07 - SULFATES (SELENATES, TELLURATES)
  07.D - Sulfates (selenates, etc.) with additional anions, with H2O
  07.DG -With large and medium sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3
 
07.DG.15 Bentorite Ca6(Cr,Al)2(SO4)3(OH)12•26(H2O) P 63/mmc 6/m 2/m 2/m
 
07.DG.15 Charlesite Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O) P 31c 3m
 
07.DG.15 Ettringite Ca6Al2(SO4)3(OH)12•26(H2O) P 63/mmc 6/m 2/m 2/m
 
07.DG.15 Jouravskite Ca3Mn(SO4,CO3)2(OH)6•12(H2O) P 63/m 6/m
 
07.DG.15 Sturmanite Ca6(Fe,Al,Mn)2(SO4)2[B(OH)4](OH)12•25(H2O) P 31c 3m
 
07.DG.15 Thaumasite Ca3Si(CO3)(SO4)(OH)6•12(H2O) P 63/m 6/m
 
07.DG.15 Buryatite! Ca3(Si,Fe,Al)[SO4][B(OH)4](OH,O)6•12(H2O) P 31c 3m
 
07.DG.15 Carraraite! Ca3Ge(OH)6(SO4)(CO3)•12H2O P 63/m, or P 63 Hex
 

Other Sturmanite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Sturmanite :
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

Search for Sturmanite using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Sturmanite :

Ask about Sturmanite 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 Sturmanite Specimen Label here :

Sturmanite

Ca6(Fe+++,Al,Mn++)2(SO4)2[B(OH)4](OH)12•25(H2O)
Dana No: 32.04.04.02 Strunz No: 07.DG.15
Locality:

 

Notes:

 

 
   
 


Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.