General Barrerite Information
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Chemical Formula: |
(Na,K,Ca)2Al2Si7O18·6(H2O) |
Composition: |
Molecular Weight = 2,680.57 gm |
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Potassium 1.55 % K 1.86 % K2O |
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Sodium 4.67 % Na 6.30 % Na2O |
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Calcium 1.26 % Ca 1.76 % CaO |
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Magnesium 0.15 % Mg 0.26 % MgO |
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Aluminum 8.24 % Al 15.58 % Al2O3 |
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Iron 0.02 % Fe 0.03 % FeO |
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Silicon 23.80 % Si 50.93 % SiO2 |
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Hydrogen 1.94 % H 17.33 % H2O |
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Oxygen 58.36 % O |
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______ ______ |
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100.00 % 94.03 % = TOTAL OXIDE |
Empirical Formula: |
Na5.45K1.06Ca0.84Mg0.17Al8.19Fe2+0.01Si22.72O72·25.78(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 |
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PDF 29-1185 |
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Barrerite Image |
Images:
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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 |
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Barrerite Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 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]
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Physical Properties of Barrerite
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Cleavage: |
[???] Perfect |
Color: |
White, Pink. |
Density: |
2.13 |
Diaphaniety: |
Transparent to Translucent |
Hardness: |
3-4 - Calcite-Fluorite |
Luster: |
Vitreous (Glassy) |
Streak: |
white |
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Optical Properties of Barrerite
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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. |
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Calculated Properties of Barrerite
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Electron Density: |
relectron=2.16 gm/cc note: rBarrerite =2.13 gm/cc. |
Fermion Index |
Fermion Index = 0.01157 Boson Index = 0.98843 |
Photoelectric: |
PEBarrerite = 1.61 barns/electron U=PEBarrerite x relectron= 3.47 barns/cc. |
Radioactivity: |
GRapi = 22.57 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Barrerite - barely detectable
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Barrerite Classification
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Dana Class: |
77.1.4.5 (77)Tectosilicate Zeolite group |
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(77.1)true zeolites |
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(77.1.4)Heulandite and related species |
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77.1.4.1 Heulandite-Ca (Ca,Na)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono |
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77.1.4.1a Heulandite-Na! (Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono |
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77.1.4.1b Heulandite-K! (K,Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 2/m |
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77.1.4.1c Heulandite-Sr! (Sr,Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono |
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77.1.4.1d Heulandite-Ba! (Ba,Ca,K,Na,Sr)5Al9Si27O72·22(H2O) C 2/m 2/m |
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77.1.4.2 Clinoptilolite-K (Na,K,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, C 2, Cm Mono |
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77.1.4.2a Clinoptilolite-Na! (Na,K,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, C 2, Cm Mono |
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77.1.4.2b Clinoptilolite-Ca! (Ca,Na,K)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m 2/m |
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77.1.4.3 Stilbite-Ca NaCa4[Al8Si28O72]·n(H2O)(n=28-32) C 2/m 2/m |
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77.1.4.3a Stilbite-Na! Na3Ca3[Al8Si28O72]·n(H2O)(n=28-32) C 2/m 2/m |
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77.1.4.4 Stellerite CaAl2Si7O18·7(H2O) F mmm 2/m 2/m 2/m |
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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 |
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VIII/J - Tectosilicates (network), with zeolite-structure, Bladed Zeolites |
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VIII/J.23 - Zeolite group, Heulandite - Barium-brewsterite series |
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VIII/J.23-06 Heulandite-Na! (Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono |
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VIII/J.23-08 Heulandite-K! (K,Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 2/m |
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VIII/J.23-10 Heulandite-Ca (Ca,Na)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono |
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VIII/J.23-12 Heulandite-Sr! (Sr,Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono |
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VIII/J.23-18 Clinoptilolite-Na! (Na,K,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, C 2, Cm Mono |
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VIII/J.23-20 Clinoptilolite-K (Na,K,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, C 2, Cm Mono |
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VIII/J.23-22 Clinoptilolite-Ca! (Ca,Na,K)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m 2/m |
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VIII/J.23-26 Stilbite-Na! Na3Ca3[Al8Si28O72]·n(H2O)(n=28-32) C 2/m 2/m |
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VIII/J.23-30 Stilbite-Ca NaCa4[Al8Si28O72]·n(H2O)(n=28-32) C 2/m 2/m |
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VIII/J.23-40 Barrerite (Na,K,Ca)2Al2Si7O18·6(H2O) Amma or Ammm 2/m 2/m 2/m |
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VIII/J.23-50 Stellerite CaAl2Si7O18·7(H2O) F mmm 2/m 2/m 2/m |
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VIII/J.23-60 Goosecreekite CaAl2Si6O16·5(H2O) P 21 2 |
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VIII/J.23-70 Epistilbite CaAl2Si6O16·5(H2O) C1 1 |
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VIII/J.23-80 Brewsterite-Sr (Sr,Ba)Al4Si12O32·10(H2O) P 21/m 2/m |
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VIII/J.23-90 Brewsterite-Ba! (Ba,Sr)Al2Si6O16·5(H2O) P 21/m,P 21 Mono |
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Other Barrerite Information
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References: |
NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
See Also: |
Links to other databases for Barrerite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - EUROmin Project
4 -Google Images
5 -Google Scholar
6 -Handbook of Mineralogy (MinSocAm)
7 -Handbook of Mineralogy (UofA)
8 -MinDAT
9 -MinMax(Deutsch)
10 -MinMax(English)
11 -Mineralienatlas (Deutsch)
12 -QUT Mineral Atlas
13 - WWW-MINCRYST
14 -École des Mines de Paris
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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:
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