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Englishite

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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.


Classification of EnglishiteHide

Approved, 'Grandfathered' (first described prior to 1959)
First Published:
1930
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
42.13.8.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
13 : Miscellaneous
19.8.21

19 : Phosphates
8 : Phosphates of Al and other metals

Physical Properties of EnglishiteHide

Vitreous, Pearly
Transparency:
Transparent
Comment:
Lustre pearly on cleavages.
Colour:
Colourless to white, grayish green; colourless in transmitted light.
Hardness:
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
Comments:
2V small.

Chemical Properties of EnglishiteHide

Formula:
K3Na2Ca10Al15(PO4)21(OH)7 · 26H2O
IMA Formula:
K3Na2Ca10Al15(OH)7(PO4)21 · 26H2O

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.

Geological EnvironmentHide

Geological Setting:
Complex granitic pegmatite.

Type Occurrence of EnglishiteHide

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:
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

ChildreniteFe2+Al(PO4)(OH)2 · H2O
EosphoriteMn2+Al(PO4)(OH)2 · H2O
MitridatiteCa2Fe3+3(PO4)3O2 · 3H2O
MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2O
PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2O
ParafransoletiteCa3Be2(PO4)2(HPO4)2 · 4H2O
RobertsiteCa2Mn3+3(PO4)3O2 · 3H2O
RoscheriteCa2Mn2+5Be4(PO4)6(OH)4 · 6H2O
TiptopiteK2(Na,Ca)2Li3Be6(PO4)6(OH)2 · H2O
WhitlockiteCa9Mg(PO4)6(HPO4)
Associated Minerals Based on Photo Data:
7 photos of Englishite associated with MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2O
6 photos of Englishite associated with VarisciteAlPO4 · 2H2O
5 photos of Englishite associated with RoscheriteCa2Mn2+5Be4(PO4)6(OH)4 · 6H2O
3 photos of Englishite associated with RobertsiteCa2Mn3+3(PO4)3O2 · 3H2O
3 photos of Englishite associated with CrandalliteCaAl3(PO4)(PO3OH)(OH)6
3 photos of Englishite associated with WarditeNaAl3(PO4)2(OH)4 · 2H2O
3 photos of Englishite associated with WavelliteAl3(PO4)2(OH,F)3 · 5H2O
2 photos of Englishite associated with WhitlockiteCa9Mg(PO4)6(HPO4)
2 photos of Englishite associated with TiptopiteK2(Na,Ca)2Li3Be6(PO4)6(OH)2 · H2O
1 photo of Englishite associated with DufréniteCa0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2O

Related Minerals - Nickel-Strunz GroupingHide

8.DH.05MinyuliteKAl2(PO4)2(OH,F) · 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.
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.
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.
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.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.
8.DH.20JuonniiteCaMgSc(PO4)2(OH) · 4H2OOrth.
8.DH.25CalcioferriteCa2Fe3+2(PO4)3(OH) · 7H2OMon. 2/m : B2/b
8.DH.25KingsmountiteCa3MnFeAl4(PO4)6(OH)4·12H2OMon. 2 : B2
8.DH.25MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2OMon. 2 : B2
8.DH.25ZodaciteCa4Mn2+Fe3+4(PO4)6(OH)4 · 12H2OMon.
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.
8.DH.35MantienneiteKMg2Al2Ti(PO4)4(OH)3 · 15H2OOrth.
8.DH.35PaulkerriteK(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.35Benyacarite(H2O,K)2(Mn2+,Fe2+)2(Fe3+,Ti)2Ti(PO4)4(O,F)2 · 14H2OOrth. mmm (2/m 2/m 2/m) : Pbca
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.
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

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

19.8.1MontebrasiteLiAl(PO4)(OH)Tric. 1 : P1
19.8.2BrazilianiteNaAl3(PO4)2(OH)4Mon. 2/m : P2/b
19.8.3WarditeNaAl3(PO4)2(OH)4 · 2H2OTet. 4 2 2 : P41 21 2
19.8.4TancoiteLiNa2Al(PO4)(HPO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pbca
19.8.5Bertossaite(Li,Na)2(Ca,Fe2+,Mn2+)Al4(PO4)4(OH,F)4Orth.
19.8.6TinsleyiteKAl2(PO4)2(OH) · 2H2OMon.
19.8.7Taranakite(K,NH4)Al3(PO4)3(OH) · 9H2OTrig. 3m (3 2/m) : R3c
19.8.8FrancoanelliteK3Al5(PO4)2(HPO4)3 · 12H2OTrig.
19.8.9GordoniteMgAl2(PO4)2(OH)2 · 8H2OTric. 1 : P1
19.8.10AldermaniteMg5Al12(PO4)8(OH)22 · 32H2OOrth.
19.8.11OveriteCaMgAl(PO4)2(OH) · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
19.8.12MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2OMon. 2 : B2
19.8.14FoggiteCaAl(PO4)(OH)2 · H2OOrth. mmm (2/m 2/m 2/m)
19.8.15GatumbaiteCaAl2(PO4)2(OH)2 · H2OMon. 2/m : P2/m
19.8.16CrandalliteCaAl3(PO4)(PO3OH)(OH)6Trig. 3m (3 2/m) : R3m
19.8.17Matulaite(Fe3+,Al)Al7(PO4)4(PO3OH)2(OH)8(H2O)8 · 8H2OMon.
19.8.19LehiiteCaAl3(PO4)(PO3OH)(OH)6
19.8.20Millisite(Na,K)CaAl6(PO4)4(OH)9 · 3H2OTet.
19.8.22KleemaniteZnAl2(PO4)2(OH)2 · 3H2OMon.
19.8.23MantienneiteKMg2Al2Ti(PO4)4(OH)3 · 15H2OOrth.
19.8.24PaulkerriteK(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2OOrth. mmm (2/m 2/m 2/m) : Pbca

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 EnglishiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Larsen, E.S., Shannon, E.V. (1930) The minerals of the phosphate nodules from near Fairfield, Utah. American Mineralogist: 15: 307-337.
Larsen, E.S. (1942) The mineralogy and paragenesis of the variscite nodules from near Fairfield, Utah, Part 1. American Mineralogist: 27: 281-300.
Palache, C., Berman, H., Frondel, C. (1951) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 957-958.
Moore, P.B. (1976) Derivative structures based on the alunite octahedral sheet: mitridatite and englishite. Mineralogical Magazine: 40: 863-866.
Dunn, P.J., Rouse, R.C., Nelen, J.A. (1984) Englishite: new chemical data and a second occurrence, from the Tip Top pegmatite, Custer, South Dakota. The Canadian Mineralogist: 22: 469-470.
Dunn, P.J., Ferraiolo, J.A., Fleischer, M., Gobel, V., Grice, J.D., Langley, R.H., Shigley, J.E., Vanko, D.A., Zilczer, J.A. (1985) New mineral names. American Mineralogist: 70: 1329-1335.

Internet Links 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 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.
USA
 
  • Nevada
    • Elko Co.
      • Bootstrap Mining District
        • Goldstrike Mines
MinRec 30:187
    • Eureka Co.
      • Carlin Trend
        • Maggie Creek Mining Subdistrict
MinRec 26(5):449-469.
      • Lynn Mining District
        • Elko
Mineralogical Record 26:467
    • Humboldt Co.
      • Osgood Mountains
        • Potosi Mining District
NBMG Spec. Pub. 31 Minerals of Nevada
  • South Dakota
    • Custer Co.
      • Custer Mining District
        • Fourmile
Rocks & Minerals: 60: 117.
  • Utah
    • Utah Co.
      • Oquirrh Mountains
        • Fairfield
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 958; UGMS Bull 117 Minerals and Mineral Localities of Utah.
Brent Thorne collection; Wilson, W. (2010): The Clay Canyon Variscite Mine, Fairfield Utah. Mineralogical Record. 41:321-349.
 
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