Barrerite Mineral Data

[How the Club Works] [Memberships - Junior, Deluxe , and Platinum] [FAQ] [Past Minerals]
Join the Club - Junior, Deluxe and Platinum Memberships Available
High Quality Minerals Sent to Your Home or School Each Month
Mineral of the Month Club - An Inexpensive Way to Enjoy Minerals

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.

Name Pronunciation:

Barrerite + Pronunciation

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Diaphaneity:

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
Ncalc = 1.44 - 1.46

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:

Bulk Density (Electron Density)=2.16 gm/cc
note: Specific Gravity of Barrerite =2.13 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

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)
Concentration of Barrerite per GRapi unit = 4.43 (%)

Estimated Radioactivity from Barrerite - barely detectable

Barrerite Classification

Dana Class:

77.01.04.05 (77)Tectosilicate Zeolite group

(77.01)true zeolites

(77.01.04)Heulandite and related species

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

77.01.04.01a Heulandite-Na! (Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 Mono

77.01.04.01b Heulandite-K! (K,Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 2/m

77.01.04.01c Heulandite-Sr! (Sr,Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 Mono

77.01.04.01d Heulandite-Ba! (Ba,Ca,K,Na,Sr)5Al9Si27O72•22(H2O) C 2/m 2/m

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

77.01.04.02a Clinoptilolite-Na! (Na,K,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, C 2, Cm Mono

77.01.04.02b Clinoptilolite-Ca! (Ca,Na,K)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m 2/m

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

77.01.04.03a Stilbite-Na! Na3Ca3[Al8Si28O72]•n(H2O)(n=28-32) C 2/m 2/m

77.01.04.04 Stellerite CaAl2Si7O18•7(H2O) F mmm 2/m 2/m 2/m

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

Strunz Class:

09.GE.15 09 - SILICATES (Germanates)

09.G - Tektosilicates with Zeolitic H2O

09.GE -Chains of T10O20 Tetrahedra

09.GE.15 Barrerite (Na,K,Ca)2Al2Si7O18•6(H2O) Amma or Ammm 2/m 2/m 2/m

09.GE.15 Stellerite CaAl2Si7O18•7(H2O) F mmm 2/m 2/m 2/m

Other Barrerite Information

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 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

Search for Barrerite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Barrerite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Diamond Dan Publications

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Barrerite Mineral Data :

Ask about Barrerite 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 Barrerite Specimen Label here :

Barrerite

(Na,K,Ca)2Al2Si7O18•6(H2O)
Dana No: 77.01.04.05 Strunz No: 09.GE.15
Locality:

Notes: