Manganhumite
A valid IMA mineral species
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About Manganhumite
Sir Abraham Hume
Formula:
(Mn2+,Mg)7(SiO4)3(OH)2
Colour:
Pale to deep brownish-orange
Lustre:
Sub-Adamantine
Hardness:
4
Specific Gravity:
3.83
Crystal System:
Orthorhombic
Member of:
Name:
Named in 1978 by Paul Brian Moore for its chemical composition as the Mn-dominant member of the group and relationship to humite, which was named after Sir Abraham Hume [February 20, 1749 London, England, UK â March 24, 1838 Wormley Bury. England. UK], English connoisseur and collector of gems, minerals and artwork.
Dimorph of:
Isostructural with:
Unique Identifiers
Mindat ID:
2470
Long-form identifier:
mindat:1:1:2470:5
GUID
(UUID V4):
(UUID V4):
7f6f35ca-670f-4929-8859-4937d3b9c3d6
IMA Classification of Manganhumite
Approved
IMA Formula:
Mn2+7(SiO4)3(OH)2
Approval year:
1969
First published:
1978
Type description reference:
Classification of Manganhumite
9.AF.50
9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
52.3.2c.3
52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
3 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
3 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
14.18.12
14 : Silicates not Containing Aluminum
18 : Silicates of Mn and Na, K, Mg, Ca or Fe
14 : Silicates not Containing Aluminum
18 : Silicates of Mn and Na, K, Mg, Ca or Fe
Mineral Symbols
As of 2021 there are now IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Mnhu | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Manganhumite
Sub-Adamantine
Transparency:
Transparent
Colour:
Pale to deep brownish-orange
Hardness:
4 on Mohs scale
Cleavage:
Perfect
{010}
{010}
Density:
3.83(5) g/cm3 (Measured) 3.84 g/cm3 (Calculated)
Comment:
Measured with Berman torsion balance
Optical Data of Manganhumite
Type:
Biaxial (+)
RI values:
nα = 1.707(3) nβ = 1.712(3) nγ = 1.723(3)
2V:
Measured: 37° (4), Calculated: 70°
Birefringence:
Moderate
Max Birefringence:
δ = 0.016
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v weak
Pleochroism:
Not Visible
Chemistry of Manganhumite
Mindat Formula:
(Mn2+,Mg)7(SiO4)3(OH)2
Common Impurities:
Ti,Al,Fe,Ca,F,H20,P
Crystallography of Manganhumite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 10.54 Å, b = 21.45 Å, c = 4.82 Å
Ratio:
a:b:c = 0.491 : 1 : 0.225
Unit Cell V:
1,089.72 Ă
Âł (Calculated from Unit Cell)
Morphology:
Anhedral grains, to about 1 cm
Comment:
Space Group: Pbnm
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0000686 | Manganhumite | Francis C A, Ribbe P H (1978) Crystal structures of the humite minerals: V. Magnesian manganhumite American Mineralogist 63 874-877 |  | 1978 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 1.777 Ă | (10) |
| 2.500 Ă | (7) |
| 3.371 Ă | (6) |
| 2.628 Ă | (6) |
| 1.525 Ă | (6) |
| 2.752 Ă | (5) |
| 2.813 Ă | (5b) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-đ alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
Type Occurrence of Manganhumite
General Appearance of Type Material:
Anhedral grains up to 1 mm in greatest dimension. Pale to deep brownish-orange. Often show small inclusions of katoptrite and magnetite.
Place of Conservation of Type Material:
Swedish Museum of Natural History, Stockholm, Sweden.
Harvard University, Cambridge, Massachusetts, USA, 119819.
National Museum of Natural History, Washington, D.C., USA, 137016, 162626.
Harvard University, Cambridge, Massachusetts, USA, 119819.
National Museum of Natural History, Washington, D.C., USA, 137016, 162626.
Geological Setting of Type Material:
Skarn
Associated Minerals at Type Locality:
Reference:
Moore, P.B. (1978) Manganhumite, a new species. Mineralogical Magazine: 42: 133-136.
Synonyms of Manganhumite
Other Language Names for Manganhumite
German:Manganohumit
Russian:ĐангангŃПиŃ
Simplified Chinese:é°çĄ
éçł
Spanish:Manganhumita
Relationship of Manganhumite to other Species
Member of:
Other Members of this group:
| Alleghanyite | Mn2+5(SiO4)2(OH)2 | Mon. 2/m : P21/b |
| Sonolite | Mn2+9(SiO4)4(OH)2 | Mon. 2/m : P21/b |
Related Minerals - Strunz-mindat Grouping
| 9.AF. | Chegemite | Ca7(SiO4)3(OH)2 |
| 9.AF. | Barwoodite | Mn2+6Nb5+(SiO4)2O3(OH)3 |
| 9.AF. | Jingwenite-(Y) | YAlV4+(SiO4)O2(OH)2 |
| 9.AF.05 | Sillimanite | Al2(SiO4)O |
| 9.AF.05 | Xenolite | Al10Si8O31 |
| 9.AF.10 | Andalusite | Al2(SiO4)O |
| 9.AF.10 | Kanonaite | Mn3+Al(SiO4)O |
| 9.AF.15 | Kyanite | Al2(SiO4)O |
| 9.AF.20 | Mullite | Al4+2xSi2-2xO10-x |
| 9.AF.20 | Krieselite | Al2(GeO4)F2 |
| 9.AF.23 | Boromullite | Al9BSi2O19 |
| 9.AF.25 | Yoderite | Mg(Al,Fe3+)3(SiO4)2O(OH) |
| 9.AF.30 | Magnesiostaurolite | Mg(Mg,Li)3(Al,Mg)18Si8O44(OH)4 |
| 9.AF.30 | Staurolite | Fe2+2Al9Si4O23(OH) |
| 9.AF.30 | Zincostaurolite | Zn2Al9Si4O23(OH) |
| 9.AF.35 | Topaz | Al2(SiO4)(F,OH)2 |
| 9.AF.40 | Norbergite | Mg3(SiO4)F2 |
| 9.AF.45 | Alleghanyite | Mn2+5(SiO4)2(OH)2 |
| 9.AF.45 | Chondrodite | Mg5(SiO4)2F2 |
| 9.AF.45 | Reinhardbraunsite | Ca5(SiO4)2(OH,F)2 |
| 9.AF.45 | Kumtyubeite | Ca5(SiO4)2F2 |
| 9.AF.45 | Hydroxylchondrodite | Mg5(SiO4)2(OH)2 |
| 9.AF.50 | Humite | Mg7(SiO4)3F2 |
| 9.AF.50 | Unnamed (Ca-analogue of Humite) | Ca7(SiO4)4F2 |
| 9.AF.50 | Fluorchegemite | Ca7(SiO4)3F2 |
| 9.AF.50 | Unnamed (OH-analogue of humite) | Mg7(SiO4)3(OH)2 |
| 9.AF.55 | Clinohumite | Mg9(SiO4)4F2 |
| 9.AF.55 | Sonolite | Mn2+9(SiO4)4(OH)2 |
| 9.AF.55 | Hydroxylclinohumite | Mg9(SiO4)4(OH)2 |
| 9.AF.60 | Leucophoenicite | Mn2+7(SiO4)3(OH)2 |
| 9.AF.65 | Ribbeite | Mn2+5(SiO4)2(OH)2 |
| 9.AF.70 | Jerrygibbsite | Mn2+9(SiO4)4(OH)2 |
| 9.AF.75 | Franciscanite | Mn2+6(V5+,âť)2(SiO4)2(O,OH)6 |
| 9.AF.75 | Ărebroite | Mn2+3(Sb5+,Fe3+)(SiO4)(O,OH)3 |
| 9.AF.75 | Welinite | Mn2+6(W6+,Mg)2(SiO4)2(O,OH)6 |
| 9.AF.75 | Scorticoite | Mn6(Sb,âť)ÎŁ2(SiO4)2O3(OH)3 |
| 9.AF.80 | Ellenbergerite | Mg6(Mg,Ti,Zr,âť)2(Al,Mg)6Si8O28(OH)10 |
| 9.AF.85 | Chloritoid | (Fe2+,Mg,Mn2+)Al2(SiO4)O(OH)2 |
| 9.AF.85 | Magnesiochloritoid | MgAl2(SiO4)O(OH)2 |
| 9.AF.85 | OttrĂŠlite | (Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2 |
| 9.AF.90 | Poldervaartite | CaCa[SiO3(OH)](OH) |
| 9.AF.90 | Olmiite | CaMn2+[SiO3(OH)](OH) |
| 9.AF.95 | Pilawite-(Y) | Ca2Y2Al4(SiO4)4O2(OH)2 |
Other Information
Notes:
Dissolves in warm dilute HCl
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Manganhumite
mindat.org URL:
https://www.mindat.org/min-2470.html
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References for Manganhumite
Reference List:
Francis, Carl A., Ribbe, Paul H. (1978) Crystal structures of the humite minerals: V. Magnesian manganhumite. American Mineralogist, 63 (9-10) 874-877
Fleischer, Michael, Chao, George Y., Pabst, and Adolf (1979) New Mineral Names. American Mineralogist, 64 (1-2) 241-245 p.243
Winter, G. A., Essene, E. J., Peacor, D. R. (1983) Mn-humites from Bald Knob, North Carolina: mineralogy and phase equilibria. American Mineralogist, 68 (9-10) 951-959
Localities for Manganhumite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
â - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
China | |
| Pingyi Wan (2002) |
| Pingyi Wan (2002) |
| Pingyi Wan (2002) |
| Pingyi Wan (2002) |
| Pingyi Wan (2002) | |
Japan | |
| White & Hyde (1982) |
Romania | |
| HĂŽrtopanu et al. (2003) | |
| Hârtopanu et al. (1996) |
| Hirtopanu et al. (2015) |
| minerals-of-the-carpathians.eu (2008) |
| HĂŽrtopanu (1997) +1 other reference |
Sweden | |
| Holtstam et al. (1999) |
| |
| Raade (1993) | |
| Moore (1978) |
| Nysten (2003) | |
| OT. Ljøstad collection (analysed by Gunnar Raade) | |
USA | |
| Färber (n.d.) |
| Dunn (1985) +1 other reference |
| Rocks & Min.: 60:130-135. |
| Tracy et al. (2003) |
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Franklin Mine, Franklin, Sussex County, New Jersey, USA