Earlshannonite
A valid IMA mineral species
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About Earlshannonite
Formula:
Mn2+Fe3+2(PO4)2(OH)2 · 4H2O
Colour:
Dark reddish brown, yellowish brown, yellow-orange, bright yellow
Lustre:
Vitreous
Hardness:
3 - 4
Specific Gravity:
2.90
Crystal System:
Monoclinic
Member of:
Name:
Named in 1984 by Donald R. Peacor, Pete J. Dunn, and William B. Simmons in honor of Earl Victor Shannon [February 16, 1895 Idaho, USA - October 23, 1981 Hampton, Virginia, USA], assistant curator of the U.S. National Museum (~1918-~1929), mineralogist, morphological crystallographer, and chemist. Shannon's work ended in 1929 due to formaldehyde poisoning that destroyed his brain. He remained in supervised care for the remainder of his life. Several papers appeared in 1930 with Shannon as the second author and may have been unfinished research papers that were completed by colleagues.
Unique Identifiers
Mindat ID:
1345
Long-form identifier:
mindat:1:1:1345:7
GUID
(UUID V4):
(UUID V4):
b4a0423d-b635-43b6-afec-326a9149c3d0
IMA Classification of Earlshannonite
Approved
Approval year:
1983
First published:
1984
Classification of Earlshannonite
8.DC.15
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
C : With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
C : With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
42.11.20.4
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
11 : (AB)3(XO4)2Zq·xH2O
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
11 : (AB)3(XO4)2Zq·xH2O
19.12.21
19 : Phosphates
12 : Phosphates of Mn
19 : Phosphates
12 : Phosphates 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 |
---|---|---|
Esn | 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 Earlshannonite
Vitreous
Transparency:
Transparent
Comment:
On both crystal and cleavage surfaces
Colour:
Dark reddish brown, yellowish brown, yellow-orange, bright yellow
Streak:
Light brown
Hardness:
3 - 4 on Mohs scale
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
Two poor cleavages, one is likely {100}.
Two poor cleavages, one is likely {100}.
Comment:
Fracture : even
Density:
2.90(4) g/cm3 (Measured) 2.92 g/cm3 (Calculated)
Optical Data of Earlshannonite
Type:
Biaxial (-)
RI values:
nα = 1.696 nβ = 1.745 nγ = 1.765
2V:
Measured: 64° , Calculated: 62°
Max Birefringence:
δ = 0.069
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
Optical Extinction:
Z = c.
Pleochroism:
Visible
Comments:
X = Y light yellow brown; Z yellow brown.
Comments:
Absorption: Z > X ≈ Y.
Chemistry of Earlshannonite
Mindat Formula:
Mn2+Fe3+2(PO4)2(OH)2 · 4H2O
Crystallography of Earlshannonite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 9.91 Å, b = 9.66 Å, c = 5.45 Å
β = 93.95°
β = 93.95°
Ratio:
a:b:c = 1.026 : 1 : 0.564
Unit Cell V:
520.49 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Prismatic, elongate on [001], with forms {110} (dominant) and {100} and {011} (minor). Commonly exhibit parallel growth with [001] in common.
Twinning:
Twinned on {100}.
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
9.8 Å | (100) |
6.9 Å | (80) |
2.789 Å | (70) |
4.18 Å | (60) |
3.45 Å | (60) |
2.856 Å | (60) |
4.95 Å | (40) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 4b: Highly evolved igneous rocks | >3.0 |
34 : Complex granite pegmatites | |
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47c : [Carbonates, phosphates, borates, nitrates] | |
47e : [Vanadates, chromates, manganates] |
Type Occurrence of Earlshannonite
General Appearance of Type Material:
Radial aggregates of crystals to 0.5 mm.
Place of Conservation of Type Material:
National Museum of Natural History (Smithsonian Institution), Washington, D.C., USA, #NMNH 150168.
Geological Setting of Type Material:
Pegmatite
Associated Minerals at Type Locality:
Reference:
Peacor, D.R., Dunn, P.J., Simmons, W.B. (1984) Earlshannonite, the Mn analogue of whitmoreite, from North Carolina. The Canadian Mineralogist: 22: 471-474.
Synonyms of Earlshannonite
Other Language Names for Earlshannonite
German:Earlshannonit
Spanish:Earlshannonita
Relationship of Earlshannonite to other Species
Member of:
Other Members of this group:
Arthurite | CuFe3+2(AsO4)2(OH)2 · 4H2O | Mon. 2/m : P21/b |
Bendadaite | Fe2+Fe3+2(AsO4)2(OH)2 · 4H2O | Mon. 2/m : P21/b |
Cobaltarthurite | CoFe3+2(AsO4)2(OH)2 · 4H2O | Mon. 2/m : P21/b |
Kunatite | CuFe3+2(PO4)2(OH)2 · 4H2O | Mon. 2/m : P21/b |
Ojuelaite | ZnFe3+2(AsO4)2(OH)2 · 4H2O | Mon. 2/m : P21/b |
UKI-2006-(PO:AlCuFeH) | Fe2+Al3+2(PO4)2(OH)2 · 4H2O | |
UM2006-27-PO:FeHZn | ZnFe3+2(PO4)2(OH)2 · 4H2O | Mon. |
Whitmoreite | Fe2+Fe3+2(PO4)2(OH)2 · 4H2O | Mon. 2/m : P21/b |
Common Associates
Associated Minerals Based on Photo Data:
10 photos of Earlshannonite associated with Mitridatite | Ca2Fe3+3(PO4)3O2 · 3H2O |
9 photos of Earlshannonite associated with Rockbridgeite | Fe2+Fe3+4(PO4)3(OH)5 |
8 photos of Earlshannonite associated with Strunzite | Mn2+Fe3+2(PO4)2(OH)2 · 6H2O |
6 photos of Earlshannonite associated with Strengite | FePO4 · 2H2O |
5 photos of Earlshannonite associated with Jahnsite-(CaMnMn) | {Ca}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2O |
4 photos of Earlshannonite associated with Krásnoite | Ca3Al7.7Si3P4O23.5(OH)12.1F2 · 8H2O |
3 photos of Earlshannonite associated with Phosphophyllite | Zn2Fe(PO4)2 · 4H2O |
3 photos of Earlshannonite associated with Siderite | FeCO3 |
3 photos of Earlshannonite associated with Beraunite | Fe3+6(PO4)4O(OH)4 · 6H2O |
3 photos of Earlshannonite associated with Kastningite | (Mn2+,Fe2+,Mg)Al2(PO4)2(OH)2 · 8H2O |
Related Minerals - Strunz-mindat Grouping
8.DC. | Ianbruceite | Zn2(AsO4)(OH) · 3H2O |
8.DC. | Césarferreiraite | Fe2+ Fe3+2(AsO4)2(OH)2 · 8H2O |
8.DC. | Ferrivauxite | Fe3+Al2(PO4)2(OH)3 · 5H2O |
8.DC.05 | Nissonite | Cu2Mg2(PO4)2(OH)2 · 5H2O |
8.DC.07 | Euchroite | Cu2(AsO4)(OH) · 3H2O |
8.DC.10 | Legrandite | Zn2(AsO4)(OH) · H2O |
8.DC.12 | Strashimirite | Cu8(AsO4)4(OH)4 · 5H2O |
8.DC.15 | Arthurite | CuFe3+2(AsO4)2(OH)2 · 4H2O |
8.DC.15 | Ojuelaite | ZnFe3+2(AsO4)2(OH)2 · 4H2O |
8.DC.15 | Whitmoreite | Fe2+Fe3+2(PO4)2(OH)2 · 4H2O |
8.DC.15 | Cobaltarthurite | CoFe3+2(AsO4)2(OH)2 · 4H2O |
8.DC.15 | Bendadaite | Fe2+Fe3+2(AsO4)2(OH)2 · 4H2O |
8.DC.15 | Kunatite | CuFe3+2(PO4)2(OH)2 · 4H2O |
8.DC.15 | UM2006-27-PO:FeHZn | ZnFe3+2(PO4)2(OH)2 · 4H2O |
8.DC.15 | UKI-2006-(PO:AlCuFeH) | Fe2+Al3+2(PO4)2(OH)2 · 4H2O |
8.DC.17 | Kleemanite | ZnAl2(PO4)2(OH)2 · 3H2O |
8.DC.20 | Bermanite | Mn2+Mn3+2(PO4)2(OH)2 · 4H2O |
8.DC.20 | Coralloite | Mn2+Mn3+2(AsO4)2(OH)2 · 4H2O |
8.DC.20 | Magnesiobermanite | MgMn3+2(PO4)2(OH)2 · 4H2O |
8.DC.22 | Kovdorskite | Mg2(PO4)(OH) · 3H2O |
8.DC.25 | Ferristrunzite | Fe3+Fe3+2(PO4)2(OH)3 · 5H2O |
8.DC.25 | Ferrostrunzite | Fe2+Fe3+2(PO4)2(OH)2 · 6H2O |
8.DC.25 | Metavauxite | Fe2+Al2(PO4)2(OH)2 · 8H2O |
8.DC.25 | Metavivianite | Fe2+Fe3+2(PO4)2(OH)2 · 6H2O |
8.DC.25 | Strunzite | Mn2+Fe3+2(PO4)2(OH)2 · 6H2O |
8.DC.25 | Zincostrunzite | ZnFe3+2(PO4)2(OH)2 · 6.5H2O |
8.DC.27 | Beraunite | Fe3+6(PO4)4O(OH)4 · 6H2O |
8.DC.27 | Tvrdýite | Fe2+Fe3+2 Al3(PO4)4(OH)5(H2O)4 · 2H2O |
8.DC.27 | Zincoberaunite | ZnFe3+5(PO4)4(OH)5 · 6H2O |
8.DC.30 | Gordonite | MgAl2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Laueite | Mn2+Fe3+2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Mangangordonite | Mn2+Al2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Paravauxite | Fe2+Al2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Pseudolaueite | Mn2+Fe3+2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Sigloite | Fe3+Al2(PO4)2(OH)3 · 7H2O |
8.DC.30 | Stewartite | Mn2+Fe3+2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Ushkovite | MgFe3+2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Ferrolaueite | Fe2+Fe3+2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Kastningite | (Mn2+,Fe2+,Mg)Al2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Maghrebite | MgAl2(AsO4)2(OH)2 · 8H2O |
8.DC.30 | Nordgauite | MnAl2(PO4)2(F,OH)2 · 5H2O |
8.DC.30 | Kayrobertsonite | [MnAl2(PO4)2(OH)2(H2O)4] · 2H2O |
8.DC.30 | Kummerite | Mn2+Fe3+Al(PO4)2(OH)2 · 8H2O |
8.DC.32 | Tinticite | Fe3+3(PO4)2(OH)3 · 3H2O |
8.DC.32 | Kamarizaite | Fe3+3(AsO4)2(OH)3 · 3H2O |
8.DC.35 | Vauxite | Fe2+Al2(PO4)2(OH)2 · 6H2O |
8.DC.37 | Vantasselite | Al4(PO4)3(OH)3 · 9H2O |
8.DC.40 | Cacoxenite | Fe3+24AlO6(PO4)17(OH)12 · 75H2O |
8.DC.45 | Gormanite | (Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O |
8.DC.45 | Souzalite | (Mg,Fe2+)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O |
8.DC.47 | Kingite | Al3(PO4)2F2(OH) · 7H2O |
8.DC.50 | Wavellite | Al3(PO4)2(OH,F)3 · 5H2O |
8.DC.50 | Allanpringite | Fe3+3(PO4)2(OH)3 · 5H2O |
8.DC.50 | Fluorwavellite | Al3(PO4)2(OH)2F · 5H2O |
8.DC.52 | Kribergite | Al5(PO4)3(SO4)(OH)4 · 4H2O |
8.DC.55 | Mapimite | Zn2Fe3+3(AsO4)3(OH)4 · 10H2O |
8.DC.57 | Ogdensburgite | Ca2Fe3+4(Zn,Mn2+)(AsO4)4(OH)6 · 6H2O |
8.DC.60 | Nevadaite | (Cu2+,Al,V3+)6Al8(PO4)8F8(OH)2 · 22H2O |
8.DC.60 | Cloncurryite | Cu0.5(VO)0.5Al2(PO4)2F2 · 5H2O |
8.DC.62 | Kenngottite | Mn2+3Fe3+4(PO4)4(OH)6(H2O)2 |
8.DC.67 | Molinelloite | Cu(H2O)(OH)V4+O(V5+O4) |
8.DC.70 | Whitecapsite | H16Fe2+5Fe3+14Sb3+6(AsO4)18O16 · 120H2O |
8.DC.75 | Heimite | PbCu2(AsO4)(OH)3 · 2H2O |
8.DC.80 | Lednevite | Cu[PO3(OH)] · H2O |
Fluorescence of Earlshannonite
None
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 Earlshannonite
mindat.org URL:
https://www.mindat.org/min-1345.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
References for Earlshannonite
Reference List:
Peacor, Donald R., Dunn, Peter J., Simmons, William B. (1984) Earlshannonite, the Mn analogue of whitmoreite, from North Carolina. The Canadian Mineralogist, 22 (3) 471-474
Localities for Earlshannonite
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Czech Republic | |
| Sejkora et al. (2006) |
| Staně +4 other references |
Staněk (1997) | |
Germany | |
| Mineralogical Society of America - ... |
Hochleitner et al. (2024) | |
Dill et al. (2008) | |
Poland | |
| Pieczka A. et al. (2004) |
| Włodek et al. (2011) |
| Pieczka et al. (2015) |
Portugal | |
| Alves et al. (2012) |
| Alves et al. (2013) |
ALVES et al. (2013) | |
| Pedro Alves collection and analytical ... |
USA | |
| Mineralogical Society of America - ... +1 other reference |
| King et al. (1994) +1 other reference |
| |
| Peacor et al. (1984) +1 other reference |
| |
| Thomas Loomis Collection |
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Big Chief Mine, Glendale, Keystone Mining District, Pennington County, South Dakota, USA