Mineralogy Database

Groutite Mineral Data

Search Webmineral :

General Groutite Information

Help on Chemical  Formula: Chemical Formula: Mn+++O(OH)
Help on Composition: Composition: Molecular Weight = 87.94 gm
   Manganese  62.47 %  Mn   89.76 % Mn2O3
   Hydrogen    1.15 %  H    10.24 % H2O
   Oxygen     36.39 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn3+O(OH)
Help on Environment: Environment: A secondary mineral lining vugs in weathered banded iron formations. Trimorphous with manganite and feitknechtite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1945
Help on Locality: Locality: Mahnomen mine, Cuyuna Range, Crow Wing Co., Minnesota, USA Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Frank Fitch Grout (1880-1958), petrologist, of the University of Minnesota, Minneapolis, Minnesota, USA.
Help on Name Pronunciation: Name Pronunciation: Groutite Say GROUTITE
Help on Synonym: Synonym: ICSD 30659
  PDF 24-713

Groutite Image

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


Comments: Prismatic crystals of groutite in white marble.
Location: Talcville, Saint Lawrence County, New York, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Groutite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4261:1:0.2663
Help on Cell Dimensions: Cell Dimensions: a = 4.56, b = 10.7, c = 2.85, Z = 4; V = 139.06 Den(Calc)= 4.20
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbnm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.2(1), 2.67(0.7), 2.81(0.7),

Physical Properties of Groutite

Help on Cleavage: Cleavage: {010} Perfect, {100} Distinct
Help on Color: Color: Blue black.
Help on Density: Density: 4.144
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Adamantine - Metallic
Help on Streak: Streak: dark brown

Optical Properties of Groutite

Help on Optical Data: Optical Data: Biaxial (?)
  NCalc= 2.28 - from Gladstone-Dale relationship (KC = 0.305) where Ncalc=Dcalc*KC+1
NCalc= 2.26 - from Gladstone-Dale relationship (KC = 0.305) where Ncalc=Dmeas*KC+1
Help on Pleochroism (x): Pleochroism (x): very dark brown or black.
Help on Pleochroism (y): Pleochroism (y): yellowish brown or yellowish brown.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Groutite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   13.70   22.00 
 420 nm   13.40   21.30 
 440 nm   13.30   20.70 
 460 nm   13.10   20.20 
 480 nm   13.00   19.70 
 500 nm   13.00   19.40 
 520 nm   12.90   19.10 
 540 nm   12.90   19.00 
 560 nm   12.80   19.00 
 580 nm   12.70   18.70 
 600 nm   12.70   18.60 
 620 nm   12.70   18.50 
 640 nm   12.60   18.30 
 660 nm   12.50   18.20 
 680 nm   12.40   18.00 
 700 nm   12.40   17.90 
Calculated Relative Intensity Colors of Groutite in Air
   0%   70% 100% 140% 210% 280% 350% 420% 490% 560% 630% 690%

Calculated Properties of Groutite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.01 gm/cc
note: Specific Gravity of Groutite =4.20 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001763676
Boson Index = 0.9998236324
Help on Photoelectric: Photoelectric: PEGroutite = 16.21 barns/electron
U=PEGroutite x rElectron Density= 65.03 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Groutite is Not Radioactive

Groutite Classification

Help on  Dana Class: Dana Class: (06)Hydroxides and Oxides Containing Hydroxyl
  (06.01)where X+++O OH
  (06.01.01)Diaspore group (Orthorhombic, Pnma or Pnmd) Diaspore AlO(OH) Pbnm 2/m 2/m 2/m Goethite FeO(OH) Pbnm 2/m 2/m 2/m Groutite MnO(OH) Pbnm 2/m 2/m 2/m Montroseite (V,Fe,V)O(OH) Pbnm 2/m 2/m 2/m Bracewellite CrO(OH) Pbnm 2/m 2/m 2/m Tsumgallite! GaO(OH) Pbnm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.FD.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.F - Hydroxides (without V or U)
  04.FD -Hydroxides with OH, without H2O; chains of edge-sharing octahedra
04.FD.10 Bracewellite CrO(OH) Pbnm 2/m 2/m 2/m
04.FD.10 Diaspore AlO(OH) Pbnm 2/m 2/m 2/m
04.FD.10 Guyanaite CrO(OH) Pnnm 2/m 2/m 2/m
04.FD.10 Groutite MnO(OH) Pbnm 2/m 2/m 2/m
04.FD.10 Goethite FeO(OH) Pbnm 2/m 2/m 2/m
04.FD.10 Montroseite (V,Fe,V)O(OH) Pbnm 2/m 2/m 2/m
04.FD.10 Tsumgallite! GaO(OH) Pbnm 2/m 2/m 2/m

Other Groutite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Groutite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
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 Groutite using:

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

Visit our Advertisers for Groutite :

Ask about Groutite 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 Espa´┐Żol

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


Dana No: Strunz No: 04.FD.10





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