General Heulandite-Na Information
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Chemical Formula: |
(Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) |
Composition: |
Molecular Weight = 2,725.48 gm |
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Potassium 0.79 % K 0.95 % K2O |
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Sodium 3.36 % Na 4.53 % Na2O |
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Calcium 2.60 % Ca 3.64 % CaO |
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Aluminum 7.76 % Al 14.66 % Al2O3 |
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Silicon 28.85 % Si 61.73 % SiO2 |
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Hydrogen 1.61 % H 14.37 % H2O |
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Oxygen 55.03 % O |
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______ ______ |
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100.00 % 99.88 % = TOTAL OXIDE |
Empirical Formula: |
Na3.98Ca1.77K0.55Al7.84Si28O72·21.74(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. |
Synonym: |
Beaumontite |
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Lamellar zeolite |
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Heulandite-Na Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 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
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Physical Properties of Heulandite-Na
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Cleavage: |
[010] Perfect |
Color: |
White, Reddish white, Grayish white, Brownish white, Yellow. |
Density: |
2.2 |
Diaphaniety: |
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 |
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Optical Properties of Heulandite-Na
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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 |
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. |
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Calculated Properties of Heulandite-Na
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Electron Density: |
relectron=2.22 gm/cc note: rHeulandite-Na =2.20 gm/cc. |
Fermion Index |
Fermion Index = 0.01377 Boson Index = 0.98623 |
Photoelectric: |
PEHeulandite-Na = 1.81 barns/electron U=PEHeulandite-Na x relectron= 4.03 barns/cc. |
Radioactivity: |
GRapi = 11.50 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Heulandite-Na - barely detectable
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Heulandite-Na Classification
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Dana Class: |
77.1.4.1a (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.23-06 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 Heulandite-Na Information
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References: |
NAME( Duda&Rejl90) PHYS. PROP.(CanMin, v 35, p 1585) OPTIC PROP.(Dana8) |
See Also: |
Links to other databases for Heulandite-Na :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 -Google Images
4 -Google Scholar
5 -MinDAT
6 -MinMax(Deutsch)
7 -MinMax(English)
8 -Mineralienatlas (Deutsch)
9 -QUT Mineral Atlas
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Heulandite-Na
(Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O)
Dana No: 77.1.4.1a Strunz No: VIII/J.23-06
Locality:
Notes:
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