Heulandite-K Mineral Data

General Heulandite-K Information

Chemical Formula:

(K,Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O)

Composition:

Molecular Weight = 2,900.18 gm

Potassium 3.24 % K 3.90 % K₂O

Barium 0.57 % Ba 0.63 % BaO

Sodium 0.76 % Na 1.03 % Na₂O

Strontium 1.69 % Sr 2.00 % SrO

Calcium 2.27 % Ca 3.17 % CaO

Magnesium 0.54 % Mg 0.89 % MgO

Aluminum 8.45 % Al 15.96 % Al₂O₃

Iron 1.08 % Fe 1.54 % Fe₂O₃

Silicon 25.64 % Si 54.86 % SiO₂

Hydrogen 1.80 % H 16.05 % H₂O

Oxygen 53.98 % O

______ ______

100.00 % 100.03 % = TOTAL OXIDE

Empirical Formula:

K_2.4Na_0.96Ca_1.64Mg_0.64Sr_0.56Ba_0.12Al_9.08Fe³⁺_0.56Si_26.48O₇₂·25.84(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:

Albero Bassi, Vicenza, Italy. 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 K-dominant member of the heulandite series.

Name Pronunciation:

Heulandite-K + Pronunciation

Synonym:

Beaumontite

Lamellar zeolite

Heulandite-K Image

Images:

Heulandite-K

Comments: Coating of orange heulandite-K crystals on matix.
Location: Albero Bassi, Vicenza, Veneto, Italy. Scale: See Image.
© Rruff Database

Heulandite-K Crystallography

Axial Ratios:

a:b:c =0.9821:1:0.4261

Cell Dimensions:

a = 17.498, b = 17.816, c = 7.592, Z = 1; beta = 116.07° V = 2,125.96 Den(Calc)= 2.27

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space 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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drag2 - RMB Resize/Rotate
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Yang P , Armbruster T , Journal of Solid State Chemistry , 123 (1996) p.140-149, Na, K, Rb and Cs exchange in heulandite single-crystals: X-ray structure, refinements at 100 K, Sample: T = 100 K, Locality: Nasik, India

Physical Properties of Heulandite-K

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-K

Gladstone-Dale:

CI meas= 0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.046 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2178,KPDmeas= 0.2248,KC= 0.2283
Ncalc = 1.5 - 1.52

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-K

Electron Density:

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

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Heulandite-K= 6.23 barns/electron
U=PE_Heulandite-K x r_electron= 13.83 barns/cc.

Radioactivity:

GRapi = 47.06 (Gamma Ray American Petroleum Institute Units)
Concentration of Heulandite-K per GRapi unit = 2.12 (%)

Estimated Radioactivity from Heulandite-K - barely detectable

Heulandite-K Classification

Dana Class:

77.01.04.01b (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-K Information

References:

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

See Also:

Links to other databases for Heulandite-K :
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-K Specimen Label here :

Heulandite-K

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

Notes: