Heulandite-Na Mineral Data

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General Heulandite-Na Information

Chemical Formula:

(Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O)

Composition:

Molecular Weight = 2,725.48 gm

Potassium 0.79 % K 0.95 % K₂O

Sodium 3.36 % Na 4.53 % Na₂O

Calcium 2.60 % Ca 3.64 % CaO

Aluminum 7.76 % Al 14.66 % Al₂O₃

Silicon 28.85 % Si 61.73 % SiO₂

Hydrogen 1.61 % H 14.37 % H₂O

Oxygen 55.03 % O

______ ______

100.00 % 99.88 % = TOTAL OXIDE

Empirical Formula:

Na_3.98Ca_1.77K_0.55Al_7.84Si₂₈O₇₂•21.74(H₂O)

Environment:

Low temperature zeolite found in a wide variety of geologic environments: volcanic rocks, metamorphic rocks, pegmatites, tuffs, and deep-sea sediments.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Challis, Custer County, Idaho, U.S.A. Link to MinDat.org Location Data.

Name Origin:

Named after the English mineral collector, John Henry Heuland (1778-1856), a British mineral collector and dealer. The Na-dominant member of the heulandite series.

Name Pronunciation:

Heulandite-Na + Pronunciation

Synonym:

Beaumontite

Lamellar zeolite

Heulandite-Na Image

Images:

Heulandite-Na

Comments: Orange tabular crystals of heulandite-Na lining a vug.
Location: Warm Spring Creek, Challis, Custer County, Idaho, USA. Scale: See Image.
© Rruff Database

Heulandite-Na Crystallography

Axial Ratios:

a:b:c =0.9826:1:0.4117

Cell Dimensions:

a = 17.67, b = 17.982, c = 7.404, Z = 1; beta = 116.4° V = 2,107.22 Den(Calc)= 2.15

Crystal System:

MonoclinicSpace Group: C 2/m, Cm, C 2

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

By Intensity(I/I_o): 3.917(1), 2.959(0.9), 8.845(0.8),

Crystal Structure:

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Gunter M E , Armbruster T , Kohler T , Knowles C R , American Mineralogist , 79 (1994) p.675-682, Crystal structure and optical properties of Na- and Pb-exchanged, heulandite-group zeolites, Sample: Na-exchanged, Atomic parameters from ICSD

Physical Properties of Heulandite-Na

Cleavage:

{010} Perfect

Color:

White, Reddish white, Grayish white, Brownish white, Yellow.

Density:

2.2

Diaphaneity:

Transparent to subtranslucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Crystalline - Coarse - Occurs as well-formed coarse sized crystals.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3-3.5 - Calcite-Copper Penny

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Heulandite-Na

Gladstone-Dale:

CI meas= 0.004 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.019 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.23,KPDmeas= 0.2248,KC= 0.2257
Ncalc = 1.49 - 1.5

Optical Data:

Biaxial (+), a=1.476-1.506, b=1.479-1.51, g=1.479-1.517, bire=0.0030-0.0110, 2V(Calc)=0-76, 2V(Meas)=10-48. Dispersion r > v.

Calculated Properties of Heulandite-Na

Electron Density:

Bulk Density (Electron Density)=2.22 gm/cc
note: Specific Gravity of Heulandite-Na =2.20 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Heulandite-Na}= 1.81 barns/electron
U=PE_{Heulandite-Na} x r_electron= 4.03 barns/cc.

Radioactivity:

GRapi = 11.50 (Gamma Ray American Petroleum Institute Units)
Concentration of Heulandite-Na per GRapi unit = 8.70 (%)

Estimated Radioactivity from Heulandite-Na - barely detectable

Heulandite-Na Classification

Dana Class:

77.01.04.01a (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.05 09 - SILICATES (Germanates)

09.G - Tektosilicates with Zeolitic H2O

09.GE -Chains of T10O20 Tetrahedra

09.GE.05 Clinoptilolite-Na! (Na,K,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, C 2, Cm Mono

09.GE.05 Clinoptilolite-K (Na,K,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, C 2, Cm Mono

09.GE.05 Clinoptilolite-Ca! (Ca,Na,K)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m 2/m

09.GE.05 Heulandite-Ca (Ca,Na)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 Mono

09.GE.05 Heulandite-K! (K,Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 2/m

09.GE.05 Heulandite-Na! (Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 Mono

09.GE.05 Heulandite-Sr! (Sr,Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 Mono

09.GE.05 Heulandite-Ba! (Ba,Ca,K,Na,Sr)5Al9Si27O72•22(H2O) C 2/m 2/m

Other Heulandite-Na Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Heulandite-Na :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Heulandite-Na Specimen Label here :

Heulandite-Na

(Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O)
Dana No: 77.01.04.01a Strunz No: 09.GE.05
Locality:

Notes: