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.

Name Pronunciation:

Englishite + Pronunciation

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

Diaphaneity:

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
Ncalc = 1.58

Optical Data:

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

Calculated Properties of Englishite

Electron Density:

Bulk Density (Electron Density)=2.69 gm/cc
note: Specific Gravity of Englishite =2.68 gm/cc.

Fermion Index:

Fermion Index = 0.0004119204
Boson Index = 0.9995880796

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)
Concentration of Englishite per GRapi unit = 2.09 (%)

Estimated Radioactivity from Englishite - barely detectable

Englishite Classification

Dana Class:

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

(42.13)Dana Type

(42.13.08)Dana Group

42.13.08.01 Englishite K3Na2Ca10Al15(PO4)21(OH)7•26(H2O) A2 or Aa 2

Strunz Class:

08.DH.55 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DH -With large and medium-sized cations, (OH, etc.):RO4 < 1:1

08.DH.55 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Ask about Englishite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Englishite Specimen Label here :

Englishite

K3Na2Ca10Al15(PO4)21(OH)7•26(H2O)
Dana No: 42.13.08.01 Strunz No: 08.DH.55
Locality:

Notes: