Groutite Mineral Data

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General Groutite Information

Chemical Formula:

Mn+++O(OH)

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

Empirical Formula:

Mn³⁺O(OH)

Environment:

A secondary mineral lining vugs in weathered banded iron formations. Trimorphous with manganite and feitknechtite.

IMA Status:

Valid Species (Pre-IMA) 1945

Locality:

Mahnomen mine, Cuyuna Range, Crow Wing Co., Minnesota, USA Link to MinDat.org Location Data.

Name Origin:

Named for Frank Fitch Grout (1880-1958), petrologist, of the University of Minnesota, Minneapolis, Minnesota, USA.

Name Pronunciation:

Groutite

Synonym:

ICSD 30659

PDF 24-713

Groutite Image

Images:

Groutite

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

Axial Ratios:

a:b:c =0.4261:1:0.2663

Cell Dimensions:

a = 4.56, b = 10.7, c = 2.85, Z = 4; V = 139.06 Den(Calc)= 4.20

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbnm

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

By Intensity(I/I_o): 4.2(1), 2.67(0.7), 2.81(0.7),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Wyckoff R W G , Crystal Structures , 1 (1963) p.290-295, Second edition. Interscience Publishers, New York, New York

View Additional jPOWD Structure files for Groutite
[1]

Physical Properties of Groutite

Cleavage:

{010} Perfect, {100} Distinct

Color:

Blue black.

Density:

4.144

Diaphaneity:

Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

5.5 - Knife Blade

Luster:

Adamantine - Metallic

Streak:

dark brown

Optical Properties of Groutite

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

Pleochroism (x):

very dark brown or black.

Pleochroism (y):

yellowish brown or yellowish brown.

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**
Relative Intensity	0%	70%	100%	140%	210%	280%	350%	420%	490%	560%	630%	690%
R₁
R₂

Calculated Properties of Groutite

Electron Density:

Bulk Density (Electron Density)=4.01 gm/cc
note: Specific Gravity of Groutite =4.20 gm/cc.

Fermion Index:

Fermion Index = 0.0001763676
Boson Index = 0.9998236324

Photoelectric:

PE_Groutite= 16.21 barns/electron
U=PE_Groutite x rElectron Density= 65.03 barns/cc.

Radioactivity:

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

Groutite Classification

Dana Class:

06.01.01.03 (06)Hydroxides and Oxides Containing Hydroxyl

(06.01)where X+++O OH

(06.01.01)Diaspore group (Orthorhombic, Pnma or Pnmd)

06.01.01.01 Diaspore AlO(OH) Pbnm 2/m 2/m 2/m

06.01.01.02 Goethite FeO(OH) Pbnm 2/m 2/m 2/m

06.01.01.03 Groutite MnO(OH) Pbnm 2/m 2/m 2/m

06.01.01.04 Montroseite (V,Fe,V)O(OH) Pbnm 2/m 2/m 2/m

06.01.01.05 Bracewellite CrO(OH) Pbnm 2/m 2/m 2/m

06.01.01.06 Tsumgallite! GaO(OH) Pbnm 2/m 2/m 2/m

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

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

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 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - MinMax(Deutsch)
12 - MinMax(English)
13 - Mineralienatlas (Deutsch)
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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

Groutite

Mn+++O(OH)
Dana No: 06.01.01.03 Strunz No: 04.FD.10
Locality:

Notes: