Englishite Mineral Data

Englishite Mineral Data +

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General Englishite Information

Chemical Formula:

K3Na2Ca10Al15(PO4)21(OH)7·26(H2O)

Composition:

Molecular Weight = 3,550.62 gm

Potassium 3.30 % K 3.98 % K₂O

Sodium 1.29 % Na 1.75 % Na₂O

Calcium 11.29 % Ca 15.79 % CaO

Aluminum 11.40 % Al 21.54 % Al₂O₃

Phosphorus 18.32 % P 41.98 % P₂O₅

Hydrogen 1.67 % H 14.97 % H₂O

Oxygen 52.72 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₃Na₂Ca₁₀Al₁₅(PO₄)₂₁(OH)₇·26(H₂O)

Environment:

In variscite nodules.

IMA Status:

Valid Species (Pre-IMA) 1930

Locality:

Clay Canyon, Fairfield, Utah County, Utah, USA. Link to MinDat.org Location Data.

Name Origin:

Named for George L. English (1864-1944), American mineral dealer and collector.

Englishite Image

Images:

Englishite

Comments: Bluish colliform englishite crystals.
Location: Clay Canyon, Fairfield, Utah County, Utah. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Englishite Roscherite

Comments: Black crystalline aggregate of roscherite on white englishite.
Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Englishite Tiptopite Montgomeryite

Comments: Red montgomeryite lath-like crystals to 1mm in 2mm rosettes associated with clear, acicular sprays of tiptopite to 0.75mm and white cottonball-like crystals of englishite to 0.2mm.
Location: Tip Top mine, Custer Co., South Dakota, USA. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Englishite Crystallography

Axial Ratios:

a:b:c =3.2403:1:1.7428

Cell Dimensions:

a = 38.43, b = 11.86, c = 20.67, Z = 4; beta = 111.27° V = 8,779.22 Den(Calc)= 2.69

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: A2 or Aa

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 9.3(1), 2.86(0.7), 1.72(0.6),

Physical Properties of Englishite

Cleavage:

[001] Perfect

Color:

Colorless, White.

Density:

2.68

Diaphaniety:

Transparent to Translucent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Friable - Loosley cohesive material that granulates with your fingers.

Habit:

Micaceous - Platy texture with "flexible" plates.

Hardness:

3 - Calcite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Pearly

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Englishite

Gladstone-Dale:

CI meas= 0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2123,KPDmeas= 0.2131,KC= 0.2166

Optical Data:

Biaxial (-), a=1.57, g=1.572, bire=0.0020

Calculated Properties of Englishite

Electron Density:

r_electron=2.69 gm/cc
note: r_Englishite=2.68 gm/cc.

Fermion Index

Fermion Index = 0.00041
Boson Index = 0.99959

Photoelectric:

PE_Englishite= 2.96 barns/electron
U=PE_Englishite x r_electron= 7.97 barns/cc.

Radioactivity:

GRapi = 47.90 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Englishite - barely detectable

Englishite Classification

Dana Class:

42.13.8.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.13)Dana Type

(42.13.8)Dana Group

42.13.8.1 Englishite K3Na2Ca10Al15(PO4)21(OH)7·26(H2O) A2 or Aa 2

Strunz Class:

VII/D.25-40 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.25 - Lavendulan series

VII/D.25-10 Sampleite NaCaCu5(PO4)4Cl·5(H2O) pseudo TET 2/m 2/m 2/m

VII/D.25-20 Lavendulan NaCaCu5(AsO4)4Cl·5(H2O) Unk Ortho

VII/D.25-22 Zinclavendulan* NaCa(Zn,Cu)5(AsO4)4Cl·4-5(H2O) Unk Ortho

VII/D.25-24 Lemanskiite! NaCaCu5(AsO4)4Cl·5(H2O) P 4₁22 or P 4₃22 Tetra

VII/D.25-25 Zdenekite NaPbCu5(AsO4)4Cl·5(H2O) P 4₁22,P 4₃22 4 2 2

VII/D.25-27 Mahnertite! (Na,Ca)Cu3(AsO4)2Cl·5(H2O) I 4mmm 4 2 2

VII/D.25-30 Shubnikovite Ca2Cu8(AsO4)6Cl(OH)·7(H2O)(?) Unk Ortho

VII/D.25-33 Goldquarryite! (Cu,[])(Cd,Ca)2Al3(PO4)4F2(H2O)10{(H2O,F)}2 P1 1

VII/D.25-35 Andyrobertsite! KCdCu5(AsO4)4[As(OH)2O2]·2(H2O) P 2₁/m 2/m

VII/D.25-36 Calcio-andyrobertsite-1M! KCaCu5(AsO4)4[As(OH)2O2]·2(H2O) P 2₁/m 2/m

VII/D.25-36* Calcio-andyrobertsite-2O! KCaCu5(AsO4)4[As(OH)2O2]·2(H2O) P nma 2/m 2/m 2/m

VII/D.25-38 Esperanzaite! NaCa2Al2(AsO4)2F4(OH)·2(H2O) P 2₁/m 2/m

VII/D.25-40 Englishite K3Na2Ca10Al15(PO4)21(OH)7·26(H2O) A2 or Aa 2

Other Englishite Information

References:

NAME( Dana8) PHYS. PROP.(Dana) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Englishite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Englishite

K3Na2Ca10Al15(PO4)21(OH)7·26(H2O)
Dana No: 42.13.8.1 Strunz No: VII/D.25-40
Locality:

Notes: