Manganohörnesite
A valid IMA mineral species - grandfathered
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About Manganohörnesite
Formula:
Mn2+3(AsO4)2 · 8H2O
May contain some Mg replacing Mn.
Colour:
White to colorless
Lustre:
Silky
Hardness:
1
Specific Gravity:
2.64
Crystal System:
Monoclinic
Member of:
Name:
Originally named manganese-hoernesite in 1951 by Olof Gabrielson for being the manganese analogue of hornesite (now hörnesite). It was renamed by the IMA (Burke 2008) to manganohörnesite.
Isostructural with:
Vivianite Group. Related to monteneroite.
A lower hydrate (tetrahydrate) is castellaroite.
Crystals of manganohörnesite may resemble hörnesite and gypsum.
A lower hydrate (tetrahydrate) is castellaroite.
Crystals of manganohörnesite may resemble hörnesite and gypsum.
Unique Identifiers
Mindat ID:
2495
Long-form identifier:
mindat:1:1:2495:8
GUID
(UUID V4):
(UUID V4):
c375a649-c636-41bf-a25d-c661b92a0e31
IMA Classification of Manganohörnesite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1951
Classification of Manganohörnesite
8.CE.40
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
40.3.7.2
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
3 : A3(XO4)2·xH2O
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
3 : A3(XO4)2·xH2O
20.8.12
20 : Arsenates (also arsenates with phosphate, but without other anions)
8 : Arsenates of Mn
20 : Arsenates (also arsenates with phosphate, but without other anions)
8 : Arsenates of Mn
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Mhns | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Manganohörnesite
Silky
Transparency:
Transparent
Comment:
Because of common acicular habit
Colour:
White to colorless
Streak:
White
Hardness:
1 on Mohs scale
Tenacity:
Flexible
Cleavage:
Perfect
{01`0} perfect, poor on {100}, {201}, {201}
{01`0} perfect, poor on {100}, {201}, {201}
Density:
2.64 g/cm3 (Measured) 2.76 g/cm3 (Calculated)
Optical Data of Manganohörnesite
Type:
Biaxial (+)
RI values:
nα = 1.579 nβ = 1.589 nγ = 1.609
2V:
Measured: 65° to 70°, Calculated: 72°
Birefringence:
0.030
Max Birefringence:
δ = 0.030
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:
Moderate
Dispersion:
very weak
Optical Extinction:
Z nearly = c
Pleochroism:
Not Visible
Chemistry of Manganohörnesite
Mindat Formula:
Mn2+3(AsO4)2 · 8H2O
May contain some Mg replacing Mn.
May contain some Mg replacing Mn.
Elements listed:
Crystallography of Manganohörnesite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/m
Setting:
P2/m
Cell Parameters:
a = 10.385 Å, b = 28.095 Å, c = 4.774 Å
β = 105.67°
β = 105.67°
Ratio:
a:b:c = 0.37 : 1 : 0.17
Unit Cell V:
1,341.12 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Usually acicular; needle-like crystals or elongated crystals flattened along (010): As star-like aggregates.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.19 Å | (80) |
| 7.01 Å | (100) |
| 3.25 Å | (60) |
| 3.09 Å | (60) |
| 3.02 Å | (70) |
| 2.88 Å | (40) |
| 2.72 Å | (40) |
| 2.41 Å | (70) |
Comments:
ICDD 8-141
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-𝑇 alteration and/or metamorphism | |
| 31 : Thermally altered carbonate, phosphate, and iron formations | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
Geological Setting:
Fractures in manganese-bearing ores
Type Occurrence of Manganohörnesite
General Appearance of Type Material:
Crusts in fissures.
Geological Setting of Type Material:
Fractures in manganese skarn
Associated Minerals at Type Locality:
Reference:
Gabrielson, O. (1951) Manganiferous hoernesite and manganese-hoernesite from Långban, Sweden, Arkiv för Mineralogi och Geologi: 1 (11): 333-337.
Synonyms of Manganohörnesite
Other Language Names for Manganohörnesite
German:Manganhörnesit
Relationship of Manganohörnesite to other Species
Member of:
Other Members of this group:
| Annabergite | Ni3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
| Arupite | Ni3(PO4)2 · 8H2O | Mon. 2/m : B2/m |
| Babánekite | Cu3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
| Barićite | (Mg,Fe)3(PO4)2 · 8H2O | Mon. 2/m : B2/m |
| Erythrite | Co3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
| Erythrite-Köttigite Series | ||
| Hörnesite | Mg3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
| Köttigite | Zn3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
| Monteneroite | Cu2+Mn2+2(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
| Pakhomovskyite | Co3(PO4)2 · 8H2O | Mon. 2/m : B2/m |
| Parasymplesite | Fe2+3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
| Vivianite | Fe2+Fe2+2(PO4)2 · 8H2O | Mon. 2/m : B2/m |
Common Associates
Associated Minerals Based on Photo Data:
| 5 photos of Manganohörnesite associated with Hausmannite | Mn2+Mn3+2O4 |
| 5 photos of Manganohörnesite associated with Dolomite | CaMg(CO3)2 |
| 2 photos of Manganohörnesite associated with Akrochordite | (Mn2+,Mg)5(AsO4)2(OH)4 · 4H2O |
| 2 photos of Manganohörnesite associated with Adelite | CaMg(AsO4)(OH) |
| 2 photos of Manganohörnesite associated with Franklinite | Zn2+Fe3+2O4 |
| 2 photos of Manganohörnesite associated with Willemite | Zn2SiO4 |
| 1 photo of Manganohörnesite associated with Hörnesite | Mg3(AsO4)2 · 8H2O |
| 1 photo of Manganohörnesite associated with Långbanshyttanite | Pb2Mn2Mg(AsO4)2(OH)4 · 6H2O |
| 1 photo of Manganohörnesite associated with Hematite | Fe2O3 |
Related Minerals - Strunz-mindat Grouping
| 8.CE.X | Babánekite | Cu3(AsO4)2 · 8H2O |
| 8.CE. | Monteneroite | Cu2+Mn2+2(AsO4)2 · 8H2O |
| 8.CE.05 | Chudobaite | (Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2O |
| 8.CE.05 | Geigerite | Mn2+5(AsO4)2(HAsO4)2 · 10H2O |
| 8.CE.10 | Newberyite | Mg(PO3OH) · 3H2O |
| 8.CE.15 | Brassite | Mg(HAsO4) · 4H2O |
| 8.CE.20 | Phosphorrösslerite | Mg(PO3OH) · 7H2O |
| 8.CE.20 | Rösslerite | Mg(HAsO4) · 7H2O |
| 8.CE.25 | Metaswitzerite | Mn2+3(PO4)2 · 4H2O |
| 8.CE.25 | Switzerite | Mn2+3(PO4)2 · 7H2O |
| 8.CE.30 | Lindackerite | CuCu4(AsO4)2(HAsO4)2 · 9H2O |
| 8.CE.30 | Ondrušite | CaCu4(AsO4)2(HAsO4)2 · 10H2O |
| 8.CE.30 | Veselovskýite | ZnCu4(AsO4)2(HAsO4)2 · 9H2O |
| 8.CE.30 | Pradetite | CoCu4(AsO4)2(HAsO4)2 · 9H2O |
| 8.CE.30 | Klajite | MnCu4(AsO4)2(HAsO4)2 · 9-10H2O |
| 8.CE.30 | Hloušekite | (Ni,Co)Cu4(AsO4)2(AsO3OH)2 · 9H2O |
| 8.CE.35 | Bobierrite | Mg3(PO4)2 · 8H2O |
| 8.CE.40 | Annabergite | Ni3(AsO4)2 · 8H2O |
| 8.CE.40 | Arupite | Ni3(PO4)2 · 8H2O |
| 8.CE.40 | Barićite | (Mg,Fe)3(PO4)2 · 8H2O |
| 8.CE.40 | Erythrite | Co3(AsO4)2 · 8H2O |
| 8.CE.40 | Ferrisymplesite | Fe3+3(AsO4)2(OH)3 · 5H2O |
| 8.CE.40 | Hörnesite | Mg3(AsO4)2 · 8H2O |
| 8.CE.40 | Köttigite | Zn3(AsO4)2 · 8H2O |
| 8.CE.40 | Parasymplesite | Fe2+3(AsO4)2 · 8H2O |
| 8.CE.40 | Vivianite | Fe2+Fe2+2(PO4)2 · 8H2O |
| 8.CE.40 | Pakhomovskyite | Co3(PO4)2 · 8H2O |
| 8.CE.45 | Symplesite | Fe2+3(AsO4)2 · 8H2O |
| 8.CE.50 | Cattiite | Mg3(PO4)2 · 22H2O |
| 8.CE.55 | Koninckite | Fe3+PO4 · 3H2O |
| 8.CE.60 | Kaňkite | FeAsO4 · 3.5H2O |
| 8.CE.60 | Hilarionite | Fe3+2(SO4)(AsO4)(OH) · 6H2O |
| 8.CE.65 | Steigerite | Al(VO4) · 3H2O |
| 8.CE.70 | Metaschoderite | Al2(PO4)(VO4) · 6H2O |
| 8.CE.70 | Schoderite | Al2(PO4)(VO4) · 8H2O |
| 8.CE.75 | Malhmoodite | FeZr(PO4)2 · 4H2O |
| 8.CE.75 | Zigrasite | MgZr(PO4)2 · 4H2O |
| 8.CE.75 | UM2009-11-PO:CaHZr | CaZr[PO4]2 · 4H2O |
| 8.CE.80 | Santabarbaraite | Fe3+3(PO4)2(OH)3 · 5H2O |
| 8.CE.85 | Metaköttigite | (Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH) |
| 8.CE.90 | Slavkovite | Cu13(AsO4)6(AsO3OH)4 · 23H2O |
Fluorescence of Manganohörnesite
Not fluorescent.
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 Manganohörnesite
mindat.org URL:
https://www.mindat.org/min-2495.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Manganohörnesite
Localities for Manganohörnesite
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.
Chile | |
| samples analysed by Gerhard Mohn and ... |
Germany | |
| Walenta (2001) |
| Walenta (2001) | |
| Desor (04/2020) |
Slovakia | |
| Martin Števko |
Spain | |
| Rewitzer et al. (4) |
Sweden (TL) | |
| Gabrielson (1951) +1 other reference |
| Kjell Gatedal collection and ... | |
| RRUFF ID: R061005 | |
| Nysten (2004) |
| Nysten et al. (2016) +1 other reference |
Switzerland | |
| Ansermet (2012) |
USA | |
| Parker et al. (1982) +1 other reference |
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Schmiedestollen dump, Wittichen, Schenkenzell, Rottweil, Freiburg Region, Baden-Württemberg, Germany