Barrerite Mineral Data

Barrerite Mineral Data +

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General Barrerite Information

Chemical Formula:

(Na,K,Ca)2Al2Si7O18·6(H2O)

Composition:

Molecular Weight = 2,680.57 gm

Potassium 1.55 % K 1.86 % K₂O

Sodium 4.67 % Na 6.30 % Na₂O

Calcium 1.26 % Ca 1.76 % CaO

Magnesium 0.15 % Mg 0.26 % MgO

Aluminum 8.24 % Al 15.58 % Al₂O₃

Iron 0.02 % Fe 0.03 % FeO

Silicon 23.80 % Si 50.93 % SiO₂

Hydrogen 1.94 % H 17.33 % H₂O

Oxygen 58.36 % O

______ ______

100.00 % 94.03 % = TOTAL OXIDE

Empirical Formula:

Na_5.45K_1.06Ca_0.84Mg_0.17Al_8.19Fe²⁺_0.01Si_22.72O₇₂·25.78(H₂O)

Environment:

On the walls of large fractures in deeply weathered andesitic and rhyolitic lavas.

IMA Status:

Approved IMA 1974

Locality:

Found near Capo Pula, below South Efisio Tower, Nora, Sardinia, Italy. Link to MinDat.org Location Data.

Name Origin:

For Richard Maling Barrer (1910- ), New Zealand-born British teacher ad student of the chemistry of zeolites.

Synonym:

ICSD 4396

PDF 29-1185

Barrerite Image

Images:

Barrerite

Comments: Barrerite, an extremely rare zeolite was found in large cavities on a tidal flat.
Location: Rocky Pass, Kuiu Island, Alaska. Scale: 5.5 x 6 cm.
© Fabre Minerals

Barrerite Crystallography

Axial Ratios:

a:b:c =0.7496:1:0.9803

Cell Dimensions:

a = 13.643, b = 18.2, c = 17.842, Z = 2; V = 4,430.21 Den(Calc)= 2.01

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Amma or Ammm

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

By Intensity(I/I_o): 4.054(1), 9.1(1), 3.028(0.8),

Crystal Structure:

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Meneghinello E , Alberti A , Cruciani G , Sacerdoti M , McIntyre G , Ciambelli P , Rapascciuolo M T , European Journal of Mineralogy , 12 (2000) p.1123-1129, Single crystal neutron diffraction study of the natural zeolite barrerite, in its ND4-exchanged form

View Additional jPOWD Structure files for Barrerite
[1] [2]

Physical Properties of Barrerite

Cleavage:

[???] Perfect

Color:

White, Pink.

Density:

2.13

Diaphaniety:

Transparent to Translucent

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Barrerite

Gladstone-Dale:

CI meas= -0.048 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.111 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.241,KPDmeas= 0.2274,KC= 0.217

Optical Data:

Biaxial (-), a=1.4791, b=1.4851, g=1.4891, bire=0.0100, 2V(Calc)=78, 2V(Meas)=78.

Calculated Properties of Barrerite

Electron Density:

r_electron=2.16 gm/cc
note: r_Barrerite=2.13 gm/cc.

Fermion Index

Fermion Index = 0.01157
Boson Index = 0.98843

Photoelectric:

PE_Barrerite= 1.61 barns/electron
U=PE_Barrerite x r_electron= 3.47 barns/cc.

Radioactivity:

GRapi = 22.57 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Barrerite - barely detectable

Barrerite Classification

Dana Class:

77.1.4.5 (77)Tectosilicate Zeolite group

(77.1)true zeolites

(77.1.4)Heulandite and related species

77.1.4.1 Heulandite-Ca (Ca,Na)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono

77.1.4.1a Heulandite-Na! (Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono

77.1.4.1b Heulandite-K! (K,Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 2/m

77.1.4.1c Heulandite-Sr! (Sr,Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono

77.1.4.1d Heulandite-Ba! (Ba,Ca,K,Na,Sr)5Al9Si27O72·22(H2O) C 2/m 2/m

77.1.4.2 Clinoptilolite-K (Na,K,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, C 2, Cm Mono

77.1.4.2a Clinoptilolite-Na! (Na,K,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, C 2, Cm Mono

77.1.4.2b Clinoptilolite-Ca! (Ca,Na,K)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m 2/m

77.1.4.3 Stilbite-Ca NaCa4[Al8Si28O72]·n(H2O)(n=28-32) C 2/m 2/m

77.1.4.3a Stilbite-Na! Na3Ca3[Al8Si28O72]·n(H2O)(n=28-32) C 2/m 2/m

77.1.4.4 Stellerite CaAl2Si7O18·7(H2O) F mmm 2/m 2/m 2/m

77.1.4.5 Barrerite (Na,K,Ca)2Al2Si7O18·6(H2O) Amma or Ammm 2/m 2/m 2/m

Strunz Class:

VIII/J.23-40 VIII - Silicates

VIII/J - Tectosilicates (network), with zeolite-structure, Bladed Zeolites

VIII/J.23 - Zeolite group, Heulandite - Barium-brewsterite series

VIII/J.23-06 Heulandite-Na! (Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono

VIII/J.23-08 Heulandite-K! (K,Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 2/m

VIII/J.23-10 Heulandite-Ca (Ca,Na)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono

VIII/J.23-12 Heulandite-Sr! (Sr,Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono

VIII/J.23-18 Clinoptilolite-Na! (Na,K,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, C 2, Cm Mono

VIII/J.23-20 Clinoptilolite-K (Na,K,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, C 2, Cm Mono

VIII/J.23-22 Clinoptilolite-Ca! (Ca,Na,K)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m 2/m

VIII/J.23-26 Stilbite-Na! Na3Ca3[Al8Si28O72]·n(H2O)(n=28-32) C 2/m 2/m

VIII/J.23-30 Stilbite-Ca NaCa4[Al8Si28O72]·n(H2O)(n=28-32) C 2/m 2/m

VIII/J.23-40 Barrerite (Na,K,Ca)2Al2Si7O18·6(H2O) Amma or Ammm 2/m 2/m 2/m

VIII/J.23-50 Stellerite CaAl2Si7O18·7(H2O) F mmm 2/m 2/m 2/m

VIII/J.23-60 Goosecreekite CaAl2Si6O16·5(H2O) P 2₁ 2

VIII/J.23-70 Epistilbite CaAl2Si6O16·5(H2O) C1 1

VIII/J.23-80 Brewsterite-Sr (Sr,Ba)Al4Si12O32·10(H2O) P 2₁/m 2/m

VIII/J.23-90 Brewsterite-Ba! (Ba,Sr)Al2Si6O16·5(H2O) P 2₁/m,P 2₁ Mono

Other Barrerite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Barrerite

(Na,K,Ca)2Al2Si7O18·6(H2O)
Dana No: 77.1.4.5 Strunz No: VIII/J.23-40
Locality:

Notes: