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Groutite Mineral Data
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General Groutite Information
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 Chemical Formula: |
Mn+++O(OH) |
| Composition: |
Molecular Weight = 87.94 gm |
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Manganese 62.47 % Mn 89.76 % Mn2O3 |
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Hydrogen 1.15 % H 10.24 % H2O |
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Oxygen 36.39 % O |
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______ ______ |
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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 |
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PDF 24-713 |
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Groutite Image |
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Images:
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Groutite Crystallography
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| 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 - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbnm |
| X Ray Diffraction: |
By Intensity(I/Io): 4.2(1), 2.67(0.7), 2.81(0.7), |
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Physical Properties of Groutite
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| 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 |
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Optical Properties of Groutite
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| Optical Data: |
Biaxial (?) |
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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 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
13.70 |
22.00 |
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| 420 nm |
13.40 |
21.30 |
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| 440 nm |
13.30 |
20.70 |
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| 460 nm |
13.10 |
20.20 |
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| 480 nm |
13.00 |
19.70 |
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| 500 nm |
13.00 |
19.40 |
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| 520 nm |
12.90 |
19.10 |
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| 540 nm |
12.90 |
19.00 |
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| 560 nm |
12.80 |
19.00 |
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| 580 nm |
12.70 |
18.70 |
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| 600 nm |
12.70 |
18.60 |
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| 620 nm |
12.70 |
18.50 |
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| 640 nm |
12.60 |
18.30 |
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| 660 nm |
12.50 |
18.20 |
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| 680 nm |
12.40 |
18.00 |
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| 700 nm |
12.40 |
17.90 |
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Calculated Relative Intensity Colors of Groutite in Air
Relative
Intensity |
0% |
70% |
100% |
140% |
210% |
280% |
350% |
420% |
490% |
560% |
630% |
690% |
| R1 |
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Calculated Properties of Groutite
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| Electron Density: |
Bulk Density (Electron Density)=4.01 gm/cc
note: Specific Gravity of Groutite =4.20 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0001763676
Boson Index = 0.9998236324 |
| Photoelectric: |
PEGroutite = 16.21 barns/electron
U=PEGroutite x rElectron Density= 65.03 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Groutite is Not Radioactive |
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Groutite Classification
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| Dana Class: |
06.01.01.03 (06)Hydroxides and Oxides Containing Hydroxyl |
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(06.01)where X+++O OH |
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(06.01.01)Diaspore group (Orthorhombic, Pnma or Pnmd) |
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06.01.01.01 Diaspore AlO(OH) Pbnm 2/m 2/m 2/m |
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06.01.01.02 Goethite FeO(OH) Pbnm 2/m 2/m 2/m |
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06.01.01.03 Groutite MnO(OH) Pbnm 2/m 2/m 2/m |
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06.01.01.04 Montroseite (V,Fe,V)O(OH) Pbnm 2/m 2/m 2/m |
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06.01.01.05 Bracewellite CrO(OH) Pbnm 2/m 2/m 2/m |
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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 |
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04.F - Hydroxides (without V or U) |
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04.FD -Hydroxides with OH, without H2O; chains of edge-sharing octahedra |
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04.FD.10 Bracewellite CrO(OH) Pbnm 2/m 2/m 2/m |
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04.FD.10 Diaspore AlO(OH) Pbnm 2/m 2/m 2/m |
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04.FD.10 Guyanaite CrO(OH) Pnnm 2/m 2/m 2/m |
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04.FD.10 Groutite MnO(OH) Pbnm 2/m 2/m 2/m |
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04.FD.10 Goethite FeO(OH) Pbnm 2/m 2/m 2/m |
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04.FD.10 Montroseite (V,Fe,V)O(OH) Pbnm 2/m 2/m 2/m |
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04.FD.10 Tsumgallite! GaO(OH) Pbnm 2/m 2/m 2/m |
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Other Groutite Information
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| 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 - 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
16 - WWW-MINCRYST
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Print or Cut-and-Paste your Groutite Specimen Label here :
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Groutite
Mn+++O(OH)
Dana No: 06.01.01.03 Strunz No: 04.FD.10
Locality:
Notes:
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