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Englishite

A valid IMA mineral species - grandfathered
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01636140014950299812497.jpg
Englishite

Tip Top Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA
03117130014950299811306.jpg
Englishite, etc.

Tip Top Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA
05323050014946368712620.jpg
Englishite, etc.

Tip Top Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA
03804450014948721939327.jpg
Englishite

Tip Top Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA
05478460014948721934470.jpg
Englishite, etc.

Tip Top Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA
05323050014946368712620.jpg
Englishite, etc.

Tip Top Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA
01636140014950299812497.jpg
Englishite

Tip Top Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA
03117130014950299811306.jpg
Englishite, etc.

Tip Top Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA
Hide all sections | Show all sections

About EnglishiteHide

03885490015019316632959.jpg
George L. English
Formula:
K3Na2Ca10Al15(PO4)21(OH)7 · 26H2O
Colour:
Colourless to white, grayish green; colourless in transmitted light.
Lustre:
Vitreous, Pearly
Hardness:
3
Specific Gravity:
2.65 - 2.68
Crystal System:
Monoclinic
Name:
After George Letchworth English (14 June 1864, Philadelphia, Pennsylvania, USA - 2 January 1944, Winter Park, Florida, USA), mineral collector and dealer, New York, New York, USA. A study of his collection of phosphate nodules led to the discovery of several minerals including this one.
This page provides mineralogical data about Englishite.


Unique IdentifiersHide

Mindat ID:
1383
Long-form identifier:
mindat:1:1:1383:9
GUID
(UUID V4):
fdc6b0f1-f4f4-4c35-862b-df366a755390

IMA Classification of EnglishiteHide

IMA status:
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
K3Na2Ca10Al15(OH)7(PO4)21 · 26H2O
First published:
1930
Type description reference:
Larsen, Esper S., Shannon, Earl V. (1930) The minerals of the phosphate nodules from near Fairfield, Utah. American Mineralogist, 15 (8) 307-337

Classification of EnglishiteHide

Strunz-mindat (2024):
8.DH.55

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
H : With large and medium-sized cations, (OH, etc.):RO4 < 1:1
Dana 8th ed.:
42.13.8.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
13 : Miscellaneous
Hey's CIM Ref.:
19.8.21

19 : Phosphates
8 : Phosphates of Al and other metals

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
EgsIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of EnglishiteHide

Lustre:
Vitreous, Pearly
Transparency:
Transparent
Comment:
Lustre pearly on cleavages.
Colour:
Colourless to white, grayish green; colourless in transmitted light.
Streak:
White
Hardness:
3 on Mohs scale
Tenacity:
Flexible
Cleavage:
Perfect
On {001}, perfect, micaceous.
Density:
2.65 - 2.68 g/cm3 (Measured)    2.69 g/cm3 (Calculated)

Optical Data of EnglishiteHide

Type:
Biaxial (-)
RI values:
nα = 1.570 nβ = 1.572 nγ = 1.573
Max Birefringence:
δ = 0.003
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r > v
Optical Extinction:
X = c; Y ≃ a; Z ≃ b.
Comments:
2V small.

Chemistry of EnglishiteHide

Mindat Formula:
K3Na2Ca10Al15(PO4)21(OH)7 · 26H2O
Elements listed:
Al, Ca, H, K, Na, O, P - search for minerals with similar chemistry

Crystallography of EnglishiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 38.43 Å, b = 11.86 Å, c = 20.67 Å
β = 111.25°
Ratio:
a:b:c = 3.24 : 1 : 1.743
Unit Cell V:
8,780.42 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Layers and aggregates of subparallel plates; friable masses.
Comment:
Class 2/m or m; Space Group A2/a or Aa.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.94 Å(100)
17.66 Å(90)
2.84 Å(80)
5.57 Å(60)
2.96 Å(60)
2.68 Å(60)
1.71 Å(50)
3.85 Å(40)
2.34 Å(40)
3.08 Å(30)
2.54 Å(30)
1.58 Å(30)
1.36 Å(30)
1.08 Å(30)
0.98 Å(30)
Comments:
Fairfield, Utah, USA. Data from Moore (1976).

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Near-surface Processes
21 : Chemically precipitated carbonate, phosphate, iron formations
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]
Geological Setting:
Complex granitic pegmatite.

Type Occurrence of EnglishiteHide

Type Locality:
ⓘ Clay Canyon, Fairfield, Sunshine Mining District, Utah County, Utah, USA
General Appearance of Type Material:
Crusts in variscite nodules.
Place of Conservation of Type Material:
Harvard Unviersity, Cambridge, Massachusetts, USA: #95494.
Associated Minerals at Type Locality:
WarditeVarisciteMontgomeryiteMillisiteCrandallite
Reference:
Larsen, E.S., Shannon, E.V. (1930) The minerals of the phosphate nodules from near Fairfield, Utah. American Mineralogist: 15: 307-337.

Other Language Names for EnglishiteHide

German:Englishit
Spanish:Englishita

Common AssociatesHide

Associated Minerals Based on Photo Data:
35 photos of Englishite associated with MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2O
24 photos of Englishite associated with RoscheriteCa2Mn2+5Be4(PO4)6(OH)4 · 6H2O
23 photos of Englishite associated with TiptopiteK2(Na,Ca)2Li3Be6(PO4)6(OH)2 · H2O
13 photos of Englishite associated with VarisciteAlPO4 · 2H2O
10 photos of Englishite associated with CrandalliteCaAl3(PO4)(PO3OH)(OH)6
10 photos of Englishite associated with WarditeNaAl3(PO4)2(OH)4 · 2H2O
7 photos of Englishite associated with RobertsiteCa2Mn3+3(PO4)3O2 · 3H2O
7 photos of Englishite associated with HurlbutiteCaBe2(PO4)2
6 photos of Englishite associated with Whiteite-(CaMnMg){Ca}{Mn2+}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O
6 photos of Englishite associated with BerylBe3Al2(Si6O18)

Related Minerals - Strunz-mindat GroupingHide

8.DH.FerroberauniteFe2+Fe3+5(PO4)4(OH)5 · 6H2OMon. 2/m : B2/b
8.DH.Rowleyite[Na(NH4,K)9Cl4][V5+,4+2(P,As)O8]6 · n[H2O,Na,NH4,K,Cl]Iso.
8.DH.Ammoniotinsleyite(NH4)Al2(PO4)2(OH) · 2H2OMon. 2/m : P21/m
8.DH.Thebaite-(NH4)(NH4)3Al(C2O4)(PO3OH)2(H2O)Mon. 2/m : P21/b
8.DH.Dendoraite-(NH4)(NH4)2NaAl(C2O4)(PO3OH)2(H2O)2Mon. 2/m
8.DH.Whiteite-(MnMnMn)Mn2+Mn2+Mn2+2Al2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.Whiteite-(CaMnFe)CaMnFe2Al2(PO4)4(OH)2 · 8H2OMon. 2/m
8.DH.HochleitneriteMn2Ti3(PO4)4O2(H2O)2 · 14H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.RegeriteKFe6(PO4)4(OH)7(H2O)6 · 4H2OMon. 2/m : P21/b
8.DH.05MinyuliteKAl2(PO4)2F · 4H2OOrth. mm2 : Pba2
8.DH.10LeucophosphiteKFe3+2(PO4)2(OH) · 2H2OMon. 2/m : P21/b
8.DH.10Spheniscidite(NH4,K)(Fe3+,Al)2(PO4)2(OH) · 2H2OMon. 2/m
8.DH.10TinsleyiteKAl2(PO4)2(OH) · 2H2OMon.
8.DH.15Jahnsite-(CaMnFe){Ca}{Mn2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(CaMnMg){Ca}{Mn2+}{(Mg,Fe2+)2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(CaMnMn){Ca}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15KeckiteCaMn2+(Fe3+Mn2+)Fe3+2(PO4)4(OH)3 · 7H2OMon. 2/m : P2/b
8.DH.15Rittmannite{(Mn2+,Ca)}{Mn2+}{(Fe2+,Mn2+,Mg)2}{(Al,Fe3+)2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Whiteite-(CaFeMg){Ca}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m : P21/b
8.DH.15Whiteite-(CaMnMg){Ca}{Mn2+}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m
8.DH.15Whiteite-(MnFeMg){(Mn2+,Ca)}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m : P21/b
8.DH.15Jahnsite-(MnMnMn){Mn2+}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P21/b
8.DH.15Kaluginite(Mn2+,Ca)MgFe3+(PO4)2(OH) · 4H2OOrth.
8.DH.15Jahnsite-(CaFeFe){Ca}{Fe2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon.
8.DH.15Jahnsite-(NaFeMg)NaFe3+Mg2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(NaMnMg){(Na,Ca)}{(Mn2+,Fe3+)}{(Mg,Fe3+)2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(CaMgMg){Ca}{Mg}{Mg2}{Fe3+2}(PO4)4(OH)2 · 8H2O
8.DH.15Whiteite-(CaMnMn){Ca}{Mn2+}{Mn2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Whiteite-(MnMnMg)MnMnMg2Al2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(MnMnMg)Mn2+Mn2+Mg2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(CaFeMg)CaFe2+Mg2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(MnMnFe)Mn2+Mn2+Fe2+2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Whiteite-(CaMgMg)CaMg3Al2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(MnMnZn)Mn2+Mn2+Zn2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(NaMnMn)NaMn2+(Mn2+Fe3+)Σ2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(CaMnZn)CaMn2+Zn2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.20Lun'okite(Mn,Ca)(Mg,Fe,Mn)Al(PO4)2OH · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.20Manganosegelerite(Mn2+,Ca)(Mn2+,Fe2+,Mg)Fe3+(PO4)2(OH) · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.20OveriteCaMgAl(PO4)2(OH) · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.20SegeleriteCa2 Mg2 Fe3+2(PO4)4(OH)2 · 8H2OOrth. mmm (2/m 2/m 2/m) : Pcca
8.DH.20WilhelmvierlingiteCaMnFe3+(PO4)2(OH) · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.20JuonniiteCaMgSc(PO4)2(OH) · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.25CalcioferriteCa2Fe3+2(PO4)3(OH) · 7H2OMon. 2/m : B2/b
8.DH.25KingsmountiteCa3MnFeAl4(PO4)6(OH)4 · 12H2OTric. 1 : P1
8.DH.25MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2OMon. 2 : B2
8.DH.25ZodaciteCa4Mn2+Fe3+4(PO4)6(OH)4 · 12H2OMon.
8.DH.25FanfaniiteCa4MnAl4(PO4)6(OH)4 · 12H2OMon. 2/m : B2/b
8.DH.30ArseniosideriteCa2Fe3+3(AsO4)3O2 · 3H2OMon. 2/m : B2/b
8.DH.30KolfaniteCa2Fe3+3O2(AsO4)3 · 2H2OMon.
8.DH.30MitridatiteCa2Fe3+3(PO4)3O2 · 3H2OMon. 2/m : B2/b
8.DH.30PararobertsiteCa2Mn3+3(PO4)3O2 · 3H2OMon. 2/m : P21/b
8.DH.30RobertsiteCa2Mn3+3(PO4)3O2 · 3H2OMon. m : Bb
8.DH.30Sailaufite(Ca,Na,◻)2Mn3+3(AsO4)2(CO3)O2 · 3H2OMon. m : Bm
8.DH.35MantienneiteKMg2Al2Ti(PO4)4(OH)3 · 15H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.35PaulkerriteK(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2OMon. m
8.DH.35Benyacarite(H2O)2Mn2Ti2Fe3+(PO4)4(OF)(H2O)10 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.35Hydroxylbenyacarite(H2O)2Mn2(Ti2Fe)(PO4)4[O(OH)](H2O)10 · 4H2O Orth. mmm (2/m 2/m 2/m) : Pbca
8.DH.35MacraeiteK(H2O)Mn2(Fe2Ti)(PO4)4[O(OH)](H2O)10 · 4H2OMon. 2/m : P21/b
8.DH.40XanthoxeniteCa4Fe3+2(PO4)4(OH)2 · 3H2OTric. 1 : P1
8.DH.45MahnertiteNaCu3(AsO4)2Cl · 5H2OTet. 4/mmm (4/m 2/m 2/m) : I4/mmm
8.DH.50AndyrobertsiteKCdCu5(AsO4)4(H2AsO4) · 2H2OMon. 2/m : P21/m
8.DH.50CalcioandyrobertsiteKCaCu5(AsO4)4(H2AsO4) · 2H2OMon. 2/m : P21/m
8.DH.60BouazzeriteBi6(Mg,Co)11Fe3+14(AsO4)18(OH)4O12 · 86H2OMon. 2/m
8.DH.65GalliskiiteCa4Al2(PO4)2F8 · 5H2OTric. 1 : P1
8.DH.70JoteiteCa2CuAl(AsO4)[AsO3(OH)]2(OH)2 · 5H2OTric. 1 : P1
8.DH.75KampeliteBa6Mg3Sc8(PO4)12(OH)6 · 7H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.DH.80KapundaiteNaCaFe4(PO4)4(OH)3 · 5H2OTric. 1 : P1
8.DH.85VaniniiteCa2Mn2+3Mn3+2O2(AsO4)4 · 2H2OMon. 2/m : P21/b

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.

Internet Links for EnglishiteHide

References for EnglishiteHide

Localities for EnglishiteHide

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 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.
USA
 
  • Nevada
    • Elko County
      • Bootstrap Mining District
Jensen (1999)
    • Eureka County
      • Carlin Trend
        • Maggie Creek Mining Subdistrict
Jensen et al. (1995)
      • Lynn Mining District
        • Elko
Mineralogical Record 26:467
    • Humboldt County
      • Osgood Mountains
        • Potosi Mining District
Castor et al. (2004)
  • South Dakota
    • Custer County
      • Custer Mining District
        • Fourmile
Dunn et al. (1984) +1 other reference
  • Utah
    • Utah County
      • Sunshine Mining District
        • Fairfield
Palache et al. (1951) +1 other reference
Brent Thorne collection +1 other reference
Quick NavTopAbout EnglishiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence Other LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
 
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