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Englishite Mineral Data

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General Englishite Information

Help on Chemical  Formula: Chemical Formula: K3Na2Ca10Al15(PO4)21(OH)7•26(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: K3Na2Ca10Al15(PO4)21(OH)7•26(H2O)
Help on Environment: Environment: In variscite nodules.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1930
Help on Locality: Locality: Clay Canyon, Fairfield, Utah County, Utah, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for George L. English (1864-1944), American mineral dealer and collector.
Help on Name Pronunciation: Name Pronunciation: Englishite + Pronunciation Say ENGLISHITE

Englishite Image

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

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  Roscherite   Englishite

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

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  Tiptopite   Englishite   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

Help on Axial Ratios: Axial Ratios: a:b:c =3.2403:1:1.7428
Help on Cell Dimensions: Cell Dimensions: a = 38.43, b = 11.86, c = 20.67, Z = 4; beta = 111.27° V = 8,779.22 Den(Calc)= 2.69
Help on Crystal System: Crystal System: Monoclinic - Sphenoidal H-M Symbol (2) Space Group: A2 or Aa
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.3(1), 2.86(0.7), 1.72(0.6),

Physical Properties of Englishite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.68
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Friable - Loosley cohesive material that granulates with your fingers.
Help on Habit: Habit: Micaceous - Platy texture with "flexible" plates.
Help on Hardness: Hardness: 3 - Calcite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Pearly
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white

Optical Properties of Englishite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (-), a=1.57, g=1.572, bire=0.0020

Calculated Properties of Englishite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.69 gm/cc
note: Specific Gravity of Englishite =2.68 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0004119204
Boson Index = 0.9995880796
Help on Photoelectric: Photoelectric: PEEnglishite = 2.96 barns/electron
U=PEEnglishite x relectron= 7.97 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.13)Dana Type
  (42.13.08)Dana Group Englishite K3Na2Ca10Al15(PO4)21(OH)7•26(H2O) A2 or Aa 2
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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Dana No: Strunz No: 08.DH.55





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