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Ernstite

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About ErnstiteHide

Formula:
(Mn2+,Fe3+)Al(PO4)(OH,O)2 · H2O
Colour:
Yellow-brown
Hardness:
3 - 3½
Specific Gravity:
3.07
Crystal System:
Monoclinic
Name:
Named for Dr. Karl Theodor Heinrich Ernst ((3 January 1904, Uelzen, Germany - 26 February 1983, Erlangen, Germany), professor of mineralogy, Erlangen University, Erlangen, Germany.

Ernstite was named on oxidized eosphorite. As eosphorite has by definition Mn2+ > Fe2+, then the ferric component could never be greater than 50 mole percent and is therefore only a named variety. Some of the water molecule occupancy in the empirical eosphorite formula may be converted to hydroxyl in the same ratio as the oxidized Fe. The above formula shows only hydroxyl plus oxygen in the formula instead of (OH, O, H20) as though oxygen and hydroxyl were in equivalent sites without any residual water in the structure. If the actual original material were a childrenite, it would be possible to have a ferric-dominant oxidized member of the series. No name has been proposed for oxidized childrenite, but any such new name would have to have ferric iron > 50 mole percent of the M site. Ernstite should be re-investigated.


Classification of ErnstiteHide

Approved
Approval Year:
1970
First Published:
1970
Approval History:
IMA1970-012
8.DD.20

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
D : With only medium-sized cations, (OH, etc.):RO4= 2:1
42.7.1.3

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
7 : (AB)2(XO4)Zq·xH2O
19.12.56

19 : Phosphates
12 : Phosphates of Mn

Physical Properties of ErnstiteHide

Transparency:
Translucent
Colour:
Yellow-brown
Hardness:
3 - 3½ on Mohs scale
Cleavage:
Distinct/Good
Very Good on {100}
Good on {010}
Density:
3.07 g/cm3 (Measured)    3.086 g/cm3 (Calculated)

Optical Data of ErnstiteHide

Type:
Biaxial (-)
RI values:
nα = 1.678 nβ = 1.706 nγ = 1.721
2V:
Measured: 74° , Calculated: 70°
Max Birefringence:
δ = 0.043
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v
Pleochroism:
Visible
Comments:
X= yellowish-brown
Y= red-brown
Z= pale yellow

Chemical Properties of ErnstiteHide

Formula:
(Mn2+,Fe3+)Al(PO4)(OH,O)2 · H2O
IMA Formula:
(Mn2+,Fe3+)Al(PO4)(OH,O)2

Crystallography of ErnstiteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 13.32(1) Å, b = 10.497(5) Å, c = 6.969(4) Å
β = 90.37°
Ratio:
a:b:c = 1.269 : 1 : 0.664
Unit Cell V:
974.39 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Radial aggregates

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.364 (40)
3.516 (40)
2.836 (80)
2.829 (100)
2.438 (50)
2.424 (40)
2.001 (40)

Type Occurrence of ErnstiteHide

Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 145620.
Geological Setting of Type Material:
Oxidized granitic pegmatite
Associated Minerals at Type Locality:
Reference:
Seeliger, E., Mücke, A. (1970) Ernstit, ein neues Mn2+-Fe3+-Al-phosphat und seine beziehungen zum eosphorit. Neues Jahrbuch für Mineralogie, Monatshefte: 1970: 289-298.

Synonyms of ErnstiteHide

Other Language Names for ErnstiteHide

German:Ernstit
Spanish:Ernstita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Eosphorite4 photos of Ernstite associated with Eosphorite on mindat.org.
Kosnarite2 photos of Ernstite associated with Kosnarite on mindat.org.
Chlorapatite1 photo of Ernstite associated with Chlorapatite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.DD.05ChenevixiteCu2Fe3+2(AsO4)2(OH)4Mon. 2/m : P21/m
8.DD.05LuetheiteCu2Al2(AsO4)2(OH)4Mon. 2/m : P21/m
8.DD.10Akrochordite(Mn2+,Mg)5(AsO4)2(OH)4 · 4H2OMon. 2/m : P21/b
8.DD.10GuanacoiteCu2Mg3(AsO4)2(OH)4 · 4H2OMon. 2/m : P21/b
8.DD.15Aheylite(Fe2+,Zn)Al6(PO4)4(OH)8 · 4H2OTric. 1 : P1
8.DD.15ChalcosideriteCuFe3+6(PO4)4(OH)8 · 4H2OTric. 1 : P1
8.DD.15Faustite(Zn,Cu)Al6(PO4)4(OH)8 · 4H2OTric. 1 : P1
8.DD.15PlaneriteAl6(PO4)2(HPO4)2(OH)8 · 4 H2OTric. 1 : P1
8.DD.15TurquoiseCu(Al,Fe3+)6(PO4)4(OH)8 · 4H2OTric. 1 : P1
8.DD.15AfmiteAl3(OH)4(H2O)3(PO4)(PO3OH) · H2OTric. 1 : P1
8.DD.20ChildreniteFe2+Al(PO4)(OH)2 · H2OOrth. mm2 : Ccc2
8.DD.20EosphoriteMn2+Al(PO4)(OH)2 · H2OOrth. mmm (2/m 2/m 2/m) : Cmca

Related Minerals - Dana Grouping (8th Ed.)Hide

42.7.1.1ChildreniteFe2+Al(PO4)(OH)2 · H2OOrth. mm2 : Ccc2
42.7.1.2EosphoriteMn2+Al(PO4)(OH)2 · H2OOrth. mmm (2/m 2/m 2/m) : Cmca
42.7.1.4SinkankasiteMn2+Al(PO3OH)2(OH) · 6H2OTric.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

19.12.1MetaswitzeriteMn2+3(PO4)2 · 4H2OMon. 2/m : P2/b
19.12.2BermaniteMn2+Mn3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P2/b
19.12.3NatrophiliteNaMn2+PO4Orth. mmm (2/m 2/m 2/m) : Pmna
19.12.4SidorenkiteNa3Mn2+(CO3)(PO4)Mon.
19.12.5Niahite(NH4)(Mn2+,Mg)(PO4) · H2OOrth. mm2 : Pmn21
19.12.6RobertsiteCa2Mn3+3(PO4)3O2 · 3H2OMon. m : Bb
19.12.7PararobertsiteCa2Mn3+3(PO4)3O2 · 3H2OMon. 2/m : P21/b
19.12.8SinkankasiteMn2+Al(PO3OH)2(OH) · 6H2OTric.
19.12.9MangangordoniteMn2+Al2(PO4)2(OH)2 · 8H2OTric.
19.12.10Heterosite(Fe3+,Mn3+)PO4Orth. mmm (2/m 2/m 2/m) : Pmna
19.12.11Purpurite(Mn3+,Fe3+)PO4Orth. mmm (2/m 2/m 2/m) : Pmna
19.12.12Wolfeite(Fe2+,Mn2+)2(PO4)(OH)Mon. 2/m : P21/b
19.12.13Triploidite(Mn2+,Fe2+)2(PO4)(OH)Mon. 2/m : P2/b
19.12.14LipscombiteFe2+Fe3+2(PO4)2(OH)2Tet.
19.12.15FrondeliteMn2+Fe3+4(PO4)3(OH)5Orth. 2 2 2 : C2 2 21
19.12.16RockbridgeiteFe2+Fe3+4(PO4)3(OH)5Orth. mmm (2/m 2/m 2/m)
19.12.17Kryzhanovskite(Fe3+,Mn2+)3(PO4)2(OH,H2O)3Orth.
19.12.18LandesiteMn2+3-xFe3+x(PO4)2(OH)x · (3-x)H2OOrth.
19.12.19Phosphoferrite(Fe2+,Mn2+)3(PO4)2 · 3H2OOrth. mmm (2/m 2/m 2/m) : Pmna
19.12.20Reddingite(Mn2+,Fe2+)3(PO4)2 · 3H2OOrth. mmm (2/m 2/m 2/m) : Pmna
19.12.21EarlshannoniteMn2+Fe3+2(PO4)2(OH)2 · 4H2OMon.
19.12.22Hureaulite(Mn,Fe)5(PO4)2(HPO4)2 · 4H2OMon. 2/m : B2/b
19.12.23Switzerite(Mn,Fe)3(PO4)2 · 7H2OMon.
19.12.24LaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
19.12.25PseudolaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OMon. 2/m : P21/b
19.12.26StrunziteMn2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1
19.12.27StewartiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
19.12.28Alluaudite(Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3Mon.
19.12.29Ferroalluaudite(Na,Ca)Fe2+(Fe3+,Mn2+,Fe2+)2(PO4)3
19.12.30Fillowite{Mn2+}{Na8}{Ca4Na4}{(Mn2+,Fe2+)43}(PO4)36Trig. 3 : R3
19.12.31JohnsomervilleiteNa10Ca6Mg18Fe25(PO4)36Trig.
19.12.32WicksiteNaCa2(Fe2+,Mn2+)4MgFe3+(PO4)6 · 2H2OOrth. mmm (2/m 2/m 2/m)
19.12.33Dickinsonite-(KMnNa){KNa}{Mn2+◻}{Ca}{Na3}{Mn2+13}{Al}(PO4)12(OH)2Mon. 2/m : B2/b
19.12.34Sarcopside(Fe2+,Mn2+,Mg)3(PO4)2Mon. 2/m : P21/b
19.12.35LudlamiteFe2+3(PO4)2 · 4H2OMon. 2/m : P21/b
19.12.36GraftoniteFe2+Fe2+2(PO4)2Mon. 2/m : P21/b
19.12.37WilhelmvierlingiteCaMnFe3+(PO4)2(OH) · 2H2OOrth.
19.12.38FairfielditeCa2Mn2+(PO4)2 · 2H2OTric. 1 : P1
19.12.39BeusiteMn2+Mn2+2 (PO4)2Mon.
19.12.40MesseliteCa2Fe2+(PO4)2 · 2H2OTric. 1 : P1
19.12.41Jahnsite-(CaMnFe){Ca}{Mn2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
19.12.42Jahnsite-(CaMnMn){Ca}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
19.12.43Jahnsite-(CaMnMg){Ca}{Mn2+}{(Mg,Fe2+)2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
19.12.44KeckiteCaMn2+(Fe3+Mn2+)Fe3+2(PO4)4(OH)3 · 7H2OMon. 2/m : P2/b
19.12.45StanfielditeCa4Mg5(PO4)6Mon.
19.12.46Laubmannite(Fe2+,Mn2+,Ca)3Fe3+6(PO4)4(OH)12
19.12.47ZodaciteCa4Mn2+Fe3+4(PO4)6(OH)4 · 12H2OMon.
19.12.48HagendorfiteNaCaMn2+Fe2+2(PO4)3Mon. 2/m : B2/b
19.12.49Maghagendorfite(□,Na,)(Na,Ca,Fe2+)Mn(Mg,Fe2+,Fe3+)3(PO4)3Mon.
19.12.50VaruliteNaCaMn2+Mn2+2(PO4)3Mon. 2/m : B2/b
19.12.51GriphiteNa4Li2Ca6(Mn2+,Fe2+,Mg)19Al8(PO4)24(F,OH)8Iso. m3 (2/m 3)
19.12.52Attakolite(Ca,Sr)Mn(Al,Fe)4(HPO4,PO4)3(SiO4,PO4)(OH)4Mon. 2/m : B2/m
19.12.53Arrojadite-(KFe){KNa}{Fe2+◻}{Ca}{Na2◻}{Fe2+13}{Al}(PO4)11(HPO4)(OH)2Mon.
19.12.54Lun'okite(Mn,Ca)(Mg,Fe,Mn)Al(PO4)2OH · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
19.12.55EosphoriteMn2+Al(PO4)(OH)2 · H2OOrth. mmm (2/m 2/m 2/m) : Cmca
19.12.57ChildreniteFe2+Al(PO4)(OH)2 · H2OOrth. mm2 : Ccc2
19.12.58BobfergusoniteNa2Mn5FeAl(PO4)6Mon. 2/m : P2/b
19.12.59QingheiiteNaMn3+Mg(Al,Fe3+)(PO4)3Mon. 2/m : P21/b
19.12.60Whiteite-(CaFeMg){Ca}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m : P21/b
19.12.61Whiteite-(CaMnMg){Ca}{Mn2+}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m
19.12.62Whiteite-(MnFeMg){(Mn2+,Ca)}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m : P21/b
19.12.63Rittmannite{(Mn2+,Ca)}{Mn2+}{(Fe2+,Mn2+,Mg)2}{(Al,Fe3+)2}(PO4)4(OH)2 · 8H2OMon.
19.12.64ZanazziiteCa2Mg5Be4(PO4)6(OH)4 · 6H2OMon. 2/m : B2/b
19.12.65Samuelsonite(Ca,Ba)Ca8Fe2+2Mn2+2Al2(PO4)10(OH)2Mon. 2/m : B2/m

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for ErnstiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Seeliger, E., Mücke, A. (1970) Ernstit, ein neues Mn2+-Fe3+-Al-phosphat und seine beziehungen zum eosphorit. Neues Jahrbuch für Mineralogie, Monatshefte: 1970: 289-298.
Fleischer, M. (1971) New mineral names. American Mineralogist: 56: 631-640.
Karfunkel, J., Chaves, M.L.S.C., Banko, A., Irran, E. (1997) Ernstite and eosphorite from Minas Gerais, Brazil. The Mineralogical Record: 28: 489-493.
Costa, G.M.D., Scholz, R., Karfunkel, J., Bermanec, V., Chaves, M.L.D.S.C. (2005) Fe-Mössbauer spectroscopy on natural eosphorite-childrenite-ernstite samples. Physics and Chemistry of Minerals: 31: 714-720.

Internet Links for ErnstiteHide

Localities for ErnstiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia
 
  • South Australia
    • Mt Lofty Ranges
      • North Mt Lofty Ranges
        • Kapunda
Handbook of Mineralogy
Brazil
 
  • Minas Gerais
    • Divino das Laranjeiras
      • Linópolis
Mineralogical Record (2001) 32:249
Richard Dale collection
[MinRec 21:253-254]
    • Itinga
Taquaral, Itinga, Araçuaí, Minas Gerais, Southeast Region, Brazil
Canada
 
  • Yukon
    • Dawson mining district
[MinRec 23:Yukon 36]
Robinson, G.W., Van Velthuizen, J., Ansell, H.G. & Sturman, B.D. (1992): Mineralogy of the Rapid Creek and Big Fish River area, Yukon Territory. Mineralogical Record 23, 1-47.
Finland
 
  • Western and Inner Finland Region
    • Orivesi
      • Eräjärvi area
Sandström, F. & Lahti, S.I. (2009): Viitaniemipegmatiten i Eräjärvi, Orivesi, Finland. Litiofilen 26 (1): 11-38
Germany
 
  • Bavaria
    • Upper Palatinate
      • Neustadt an der Waldnaab
        • Reinhardsrieth
Harald G. Dill and Radek Skoda (2015) The new Nb–P aplite at Reinhardsrieth: A keystone in the lateral and depth zonations of the Hagendorf–Pleystein Pegmatite Field, SE Germany. Ore Geology Reviews 70:208–227.
Namibia (TL)
 
  • Erongo Region
    • Karibib
[NJMM (1970), 289; MinRec 2:129]
Spain
 
  • Extremadura
    • Cáceres
Merino, E., Villaseca, C., Orejana, D., & Jeffries, T. (2013). Gahnite, chrysoberyl and beryl co-occurrence as accessory minerals in a highly evolved peraluminous pluton: the Belvís de Monroy leucogranite (Cáceres, Spain). Lithos, 179, 137-156.
USA
 
  • New Hampshire
    • Grafton Co.
      • Groton
No reference listed
  • South Dakota
    • Pennington Co.
Mineral Webzine, Dec. 2001.
        • Keystone
Loomis, tom (2011), News from the Black Hills, South Dakota", Mineral News (to be published)
Mineral and/or Locality  
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