Edingtonite Mineral Data

General Edingtonite Information

Chemical Formula:

BaAl2Si3O10•4(H2O)

Composition:

Molecular Weight = 507.60 gm

Barium 27.05 % Ba 30.21 % BaO

Aluminum 10.63 % Al 20.09 % Al₂O₃

Silicon 16.60 % Si 35.51 % SiO₂

Hydrogen 1.59 % H 14.20 % H₂O

Oxygen 44.13 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BaAl₂Si₃O₁₀•4(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1825

Locality:

Kilpatrick Hills, near Glasgow, Dumbarton, Scotland. Link to MinDat.org Location Data.

Name Origin:

Named after the discoverer of the mineral, Edington from Glasgow, Scotland.

Name Pronunciation:

Edingtonite + Pronunciation

Synonym:

Antiedrite

ICSD 29516

PDF 25-60

Edingtonite Image

Images:

Edingtonite

Comments: Lath-shaped crystalline aggregates of edingtonite.
Location: Jacupiranga mine, Sao Paolo, Brazil. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Edingtonite

Comments: White, stout prisms of calcite on pinkish analcime with small, cream-colored bladed edingtionite crystals.
Location: Old Kilpatrick, Dunbartonshite, Scotland. Scale: Picture Size 3 cm.
© Dave Barthelmy

Edingtonite Crystallography

Axial Ratios:

a:b:c =0.9881:1:0.6749

Cell Dimensions:

a = 9.55, b = 9.665, c = 6.523, Z = 2; V = 602.08 Den(Calc)= 2.80

Crystal System:

Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: P 2₁2₁2

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

By Intensity(I/I_o): 2.749(1), 3.58(1), 4.8(0.9),

Physical Properties of Edingtonite

Cleavage:

{110} Perfect

Color:

Brownish gray, Colorless, Gray, White, Pink.

Density:

2.69 - 2.7, Average = 2.69

Diaphaneity:

Transparent to translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Pseudo Tetragonal - Crystals show a tetragonal shape.

Hardness:

4-5 - Fluorite-Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Edingtonite

Gladstone-Dale:

CI meas= -0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1954,KPDmeas= 0.203,KC= 0.2024
Ncalc = 1.54 - 1.57

Optical Data:

Biaxial (-), a=1.538, b=1.549, g=1.554, bire=0.0160, 2V(Calc)=66, 2V(Meas)=~50.

Calculated Properties of Edingtonite

Electron Density:

Bulk Density (Electron Density)=2.59 gm/cc
note: Specific Gravity of Edingtonite =2.70 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_Edingtonite= 113.83 barns/electron
U=PE_Edingtonite x rElectron Density= 294.92 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Edingtonite is Not Radioactive

Edingtonite Classification

Dana Class:

77.01.05.06 (77)Tectosilicate Zeolite group

(77.01)true zeolites

(77.01.05)Natrolite and related species

77.01.05.01 Natrolite Na2[Al2Si3O10]•2(H2O) F dd2 mm2

77.01.05.02 Tetranatrolite? Na2[Al2Si3O10]•2(H2O) I 42d 4 2m

77.01.05.03 Paranatrolite Na2[Al2Si3O10]•3(H2O) Cc m

77.01.05.04 Mesolite Na2Ca2Al6Si9O30•8(H2O) C 2 2

77.01.05.05 Scolecite CaAl2Si3O10•3(H2O) Cc m

77.01.05.06 Edingtonite BaAl2Si3O10•4(H2O) P 2₁2₁2 2 2 2

77.01.05.07 Gonnardite Na2CaAl4Si6O20•7(H2O) I 42d 4 2m

77.01.05.08 Cowlesite CaAl2Si3O10•5-6(H2O) P 222₁, P mmm, Pmm2 Ortho

77.01.05.09 Thomsonite-Ca NaCa2Al5Si5O20•6(H2O) Pncn 2/m 2/m 2/m

77.01.05.10 Thomsonite-Sr! (Sr,Ca)2Na[Al5Si5O20]•7(H2O) Pcnn 2/m 2/m 2/m

77.01.05.11 Nabesite! Na2BeSi4O10•4(H2O) P 2₁2₁2₁ 2 2 2

Strunz Class:

09.GA.15 09 - SILICATES (Germanates)

09.G - Tektosilicates with Zeolitic H2O

09.GA -Zeolites with T5O10 Units ï¿½ The Fibrous Zeolites

09.GA.15 Edingtonite BaAl2Si3O10•4(H2O) P 2₁2₁2 2 2 2

09.GA.15 Kalborsite K6Al4Si6BO20(OH)4Cl P 42m 4 2m

Other Edingtonite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Edingtonite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST
18 - Zeolite Database by Bruno Herreros

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Edingtonite

BaAl2Si3O10•4(H2O)
Dana No: 77.01.05.06 Strunz No: 09.GA.15
Locality:

Notes:

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