Heulandite-Ca Mineral Data

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General Heulandite-Ca Information

Chemical Formula:

(Ca,Na)2-3Al3(Al,Si)2Si13O36•12(H2O)

Composition:

Molecular Weight = 2,825.14 gm

Potassium 0.60 % K 0.72 % K₂O

Barium 0.29 % Ba 0.33 % BaO

Sodium 1.03 % Na 1.38 % Na₂O

Strontium 0.16 % Sr 0.18 % SrO

Calcium 5.06 % Ca 7.09 % CaO

Magnesium 0.01 % Mg 0.01 % MgO

Aluminum 8.95 % Al 16.91 % Al₂O₃

Silicon 26.54 % Si 56.78 % SiO₂

Hydrogen 1.86 % H 16.59 % H₂O

Oxygen 55.51 % O

______ ______

100.00 % 99.99 % = TOTAL OXIDE

Empirical Formula:

Ca_3.57Sr_0.05Ba_0.06Mg_0.01Na_1.26K_0.43Al_9.37Si_26.7O₇₂·26.02(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:

Valid Species (Pre-IMA) 1822

Locality:

Glasgow, Strathclyde (Dumbartonshire), Scotland. 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. Ca modifier added by zeolite nomenclature committee.

Name Pronunciation:

Heulandite-Ca + Pronunciation

Synonym:

Beaumontite

Heulandite

Lamellar zeolite

Heulandite-Ca Image

Images:

Heulandite-Ca

Comments: Crystals of heulandite with a green color due to chlorite inclusions.
Location: Malagaon, India. Scale: 5 x 4.5 x 3 cm.
© Isaias Casanova / IC Minerals

Images:

Heulandite-Ca Mordenite

Comments: White, acicular crystals of mordenite in heulandite geode.
Location: Rock Creek, Stevenson, Skamania County, Washington, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Heulandite-Ca Mordenite

Comments: Pink heulandite crystals up to 15 mm in fibrous white mordenite matrix.
Location: Rats Nest Claim, Challis, Custer Co., Idaho, USA. Scale: 6x6x4 cm.
© John Betts - Fine Minerals

Heulandite-Ca Crystallography

Axial Ratios:

a:b:c =0.9603:1:0.4152

Cell Dimensions:

a = 17.18, b = 17.89, c = 7.428, Z = 1; beta = 116.42° V = 2,044.55 Den(Calc)= 2.29

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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Merkle A B , Slaughter M , American Mineralogist , 52 (1967) p.273-276, The crystal structure of heulandite (Ca,Na2)[Al2Si7O18].6H2O

View Additional jPOWD Structure files for Heulandite-Ca
[1] [2] [3] [4] [5] [6] [7]

Physical Properties of Heulandite-Ca

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-Ca

Gladstone-Dale:

CI meas= 0.019 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.058 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2159,KPDmeas= 0.2248,KC= 0.2292
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-Ca

Electron Density:

Bulk Density (Electron Density)=2.23 gm/cc
note: Specific Gravity of Heulandite-Ca =2.20 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Heulandite-Ca}= 3.32 barns/electron
U=PE_{Heulandite-Ca} x r_electron= 7.41 barns/cc.

Radioactivity:

GRapi = 8.68 (Gamma Ray American Petroleum Institute Units)
Concentration of Heulandite-Ca per GRapi unit = 11.52 (%)

Estimated Radioactivity from Heulandite-Ca - barely detectable

Heulandite-Ca Classification

Dana Class:

77.01.04.01 (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-Ca Information

References:

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

See Also:

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

Heulandite-Ca

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

Notes: