Innsbruckite
A valid IMA mineral species
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About Innsbruckite
Innsbruck
Formula:
Mn33(Si2O5)14(OH)38
Colour:
Pale brownish (no colour stated in original description; inferred from similarity to bementite), nearly colourless in transmitted light (thin section).
Hardness:
6
Specific Gravity:
3.216 (Calculated)
Crystal System:
Monoclinic
Name:
Named for the type locality, found at a location 20 km south-east of Innsbruck, Austria.
Innsbruckite belongs to the group of modulated 1:1 layer silicates and is chemically and structurally closely related to bementite.
Raman spectroscopy or diffraction techniques are required to differentiate between bementite and innsbruckite (Krüger et al., 2014).
Raman spectroscopy or diffraction techniques are required to differentiate between bementite and innsbruckite (Krüger et al., 2014).
Unique Identifiers
Mindat ID:
43903
Long-form identifier:
mindat:1:1:43903:1
GUID
(UUID V4):
(UUID V4):
2fc75696-2a41-4c49-99e3-f932de65e61e
IMA Classification of Innsbruckite
Approved
Approval year:
2013
Classification of Innsbruckite
9.EE.07
9 : SILICATES (Germanates)
E : Phyllosilicates
E : Single tetrahedral nets of 6-membered rings connected by octahedral nets or octahedral bands
9 : SILICATES (Germanates)
E : Phyllosilicates
E : Single tetrahedral nets of 6-membered rings connected by octahedral nets or octahedral bands
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Ibk | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Ibk | Warr (2020) | Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30 |
Physical Properties of Innsbruckite
Colour:
Pale brownish (no colour stated in original description; inferred from similarity to bementite), nearly colourless in transmitted light (thin section).
Hardness:
6 on Mohs scale
Hardness:
VHN100=740(50) - Vickers
Density:
3.216 g/cm3 (Calculated)
Optical Data of Innsbruckite
Type:
Biaxial (-)
Comments:
Gladstone-Dale average refractive index of 1.678 was calculated
Chemistry of Innsbruckite
Mindat Formula:
Mn33(Si2O5)14(OH)38
Elements listed:
Crystallography of Innsbruckite
Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Bm
Setting:
Cm
Cell Parameters:
a = 17.276(2) Å, b = 35.957(5) Å, c = 7.2560(8) Å
β = 91.359(7)°, γ = °
β = 91.359(7)°, γ = °
Ratio:
a:b:c = 0.48 : 1 : 0.202
Unit Cell V:
4506.1 ų
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.254 Å | (100) |
| 3.627 Å | (29) |
| 3.549 Å | (15) |
| 3.516 Å | (16) |
| 2.657 Å | (77) |
| 2.654 Å | (44) |
| 2.250 Å | (32) |
| 1.655 Å | (19) |
Comments:
From Type Description.
Very similar to pattern of bementite.
Very similar to pattern of bementite.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-𝑇 alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47e : [Vanadates, chromates, manganates] |
Type Occurrence of Innsbruckite
General Appearance of Type Material:
thin platy crystals
Place of Conservation of Type Material:
Type material is deposited in the collections of the Naturhistorisches Museum Wien, Vienna, Austria, registration number N9580
Geological Setting of Type Material:
interface between a serpentinite body and cherts
Associated Minerals at Type Locality:
Synonyms of Innsbruckite
Other Language Names for Innsbruckite
German:Innsbruckit
Common Associates
Associated Minerals Based on Photo Data:
| 2 photos of Innsbruckite associated with Rhodochrosite | MnCO3 |
Related Minerals - Strunz-mindat Grouping
| 9.EE. | Cairncrossite | Sr2Ca7-xNa2x(Si4O10)4(OH)2(H2O)15-x |
| 9.EE.05 | Bementite | Mn7Si6O15(OH)8 |
| 9.EE.10 | Brokenhillite | Mn8Si6O15(OH)10 |
| 9.EE.10 | Pyrosmalite-(Fe) | Fe2+8Si6O15(OH,Cl)10 |
| 9.EE.10 | Friedelite | Mn2+8Si6O15(OH,Cl)10 |
| 9.EE.10 | Pyrosmalite-(Mn) | Mn2+8Si6O15(OH,Cl)10 |
| 9.EE.10 | Mcgillite | (Mn,Fe)8Si6O15(OH)8Cl2 |
| 9.EE.15 | Nelenite | (Mn,Fe)16(Si12O30)(OH)14[As3+3O6(OH)3] |
| 9.EE.15 | Schallerite | Mn2+16As3Si12O36(OH)17 |
| 9.EE.20 | Palygorskite | ◻Al2Mg2◻2Si8O20(OH)2(H2O)4 · 4H2O |
| 9.EE.20 | Tuperssuatsiaite | Fe3+Fe3+2(Na◻)◻2Si8O20(OH)2(H2O)4 · 2H2O |
| 9.EE.20 | Yofortierite | Mn2+Mn2+2Mn2+2◻2Si8O20(OH)2(H2O)4 · 4H2O |
| 9.EE.20 | Windhoekite | Fe3+(Fe3+1.67◻0.33)Ca2◻2Si8O20(OH)2(H2O)4(OH)2 · 6H2O |
| 9.EE.20 | Unnamed (Na-Ca-Fe-Silicate-Hydrate) | NaCa(Fe2+,Al,Mn)5[Si8O19(OH)](OH)7 · 5H2O |
| 9.EE.20 | Windmountainite | ◻Fe3+2Mg2◻2Si8O20(OH)2(H2O)4 · 4H2O |
| 9.EE.25 | Falcondoite | (Ni,Mg)4Si6O15(OH)2 · 6H2O |
| 9.EE.25 | Loughlinite | Na2Mg3Si6O16 · 8H2O |
| 9.EE.25 | Sepiolite | Mg4(Si6O15)(OH)2 · 6H2O |
| 9.EE.25 | Kalifersite | (K,Na)5Fe3+7Si20O50(OH)6 · 12H2O |
| 9.EE.30 | Gyrolite | NaCa16Si23AlO60(OH)8 · 14H2O |
| 9.EE.30 | Orlymanite | Ca4Mn3Si8O20(OH)6 · 2H2O |
| 9.EE.30 | Tungusite | Ca4Fe2Si6O15(OH)6 |
| 9.EE.35 | Reyerite | (Na,K)2Ca14(Si,Al)24O58(OH)8 · 6H2O |
| 9.EE.35 | Truscottite | (Ca,Mn)14Si24O58(OH)8 · 2H2O |
| 9.EE.35 | Kodamaite | Na3(Ca5Na)Si16O36(OH)4F2 · (14-x)H2O |
| 9.EE.40 | Natrosilite | Na2Si2O5 |
| 9.EE.45 | Makatite | Na2Si4O8(OH)2 · 4H2O |
| 9.EE.50 | Varennesite | Na8Mn2Si10O25(OH,Cl)2 · 12H2O |
| 9.EE.55 | Raite | Mn2+Mn2+2Na2(◻1.75Ti0.25)Si8O20(OH)2(H2O)4 · Na(H2O)6 |
| 9.EE.60 | Intersilite | Na6Mn2+Ti[Si10O24(OH)](OH)3 · 4H2O |
| 9.EE.65 | Shafranovskite | Na3K2(Mn,Fe,Na)4[Si9(O,OH)27](OH)2 · nH2O |
| 9.EE.65 | Zakharovite | Na4Mn5Si10O24(OH)6 · 6H2O |
| 9.EE.70 | Zeophyllite | Ca13Si10O28(OH)2F8 · 6H2O |
| 9.EE.75 | Minehillite | (K,Na)2-3Ca28Zn4Al4Si40O112(OH)16 |
| 9.EE.80 | Fedorite | (Na,K)2-3(Ca4Na3)Si16O38(OH,F)2 · 3.5H2O |
| 9.EE.80 | Martinite | (Na,◻,Ca)12Ca4(Si,S,B)14B2O38(OH,Cl)2F2 · 4H2O |
| 9.EE.80 | Ellingsenite | Na5Ca6Si18O38(OH)13 · 6H2O |
| 9.EE.85 | Lalondeite | (Na,Ca)6(Ca,Na)3Si16O38(F,OH)2 · 3H2O |
Other Information
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 Innsbruckite
mindat.org URL:
https://www.mindat.org/min-43903.html
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Please feel free to link to this page.
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References for Innsbruckite
Localities for Innsbruckite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - 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.
Austria (TL) | |
| Williams et al. (2013) +4 other references |
| Kolitsch et al. (2021) |
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Innsbruckite occurrence, Staffelsee, Navis, Innsbruck-Land District, Tyrol, Austria