Phillipsite-Ca Mineral Data

General Phillipsite-Ca Information

Chemical Formula:

(Ca,K,Na)1-2(Si,Al)8O16•6(H2O)

Composition:

Molecular Weight = 658.41 gm

Potassium 3.56 % K 4.29 % K₂O

Sodium 1.40 % Na 1.88 % Na₂O

Calcium 6.09 % Ca 8.52 % CaO

Aluminum 11.47 % Al 21.68 % Al₂O₃

Silicon 22.18 % Si 47.45 % SiO₂

Hydrogen 1.84 % H 16.42 % H₂O

Oxygen 53.46 % O

______ ______

100.00 % 100.24 % = TOTAL OXIDE

Empirical Formula:

CaK_0.6Na_0.4Si_5.2Al_2.8O₁₆•6(H₂O)

Environment:

Common zeolite in volcanic rocks, ore veins, diagenetically altered rhyolitic vitric tuffs, saline lake deposits, and ocean floor sediments. Shows solid solution toward harmotome.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Lower Salt Lake Tuff, Puuloa Road near junction with Moanalua Road, Oahu, Hawaii. Link to MinDat.org Location Data.

Name Origin:

Named after William Phillips (1775-1829), English mineralogist and founder of the Geological Society of London. The Ca-dominant member of the phillipsite series.

Name Pronunciation:

Phillipsite-Ca + Pronunciation

Synonym:

Abrazite

Cross stone

Wellsite-barian Phillipsite-Ca

Phillipsite-Ca Image

Images:

Phillipsite-Ca

Comments: White, stout-prismatic phillipsite-Ca crystals in vugs in basalt.
Location: Three Mile Creek, Ritter, Grant County, Oregon, USA. Scale: Specimen Size 2x2 cm.
© Diederik Visser

Phillipsite-Ca Crystallography

Axial Ratios:

a:b:c =0.7021:1:0.6141

Cell Dimensions:

a = 9.9, b = 14.1, c = 8.66, Z = 2; beta = 124.75° V = 993.25 Den(Calc)= 2.20

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/m

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

By Intensity(I/I_o): 3.21(1), 7.16(1), 7.18(1),

Physical Properties of Phillipsite-Ca

Cleavage:

{010} Distinct, {001} Indistinct

Color:

White, Reddish white, Light yellow, Pink.

Density:

2.2

Diaphaneity:

Translucent to opaque

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Pseudo Tetragonal - Crystals show a tetragonal shape.

Habit:

Twinning Common - Crystals are usually twinned.

Hardness:

4-5 - Fluorite-Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Phillipsite-Ca

Gladstone-Dale:

CI meas= 0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.226,KPDmeas= 0.226,KC= 0.2293
Ncalc = 1.5

Optical Data:

Biaxial (+/-), a=1.483-1.505, b=1.484-1.511, g=1.486-1.514, bire=0.0030-0.0090, 2V(Calc)=70-72, 2V(Meas)=60-90. Dispersion r > v or r < v.

Calculated Properties of Phillipsite-Ca

Electron Density:

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

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Phillipsite-Ca}= 2.33 barns/electron
U=PE_{Phillipsite-Ca} x r_electron= 5.19 barns/cc.

Radioactivity:

GRapi = 52.02 (Gamma Ray American Petroleum Institute Units)
Concentration of Phillipsite-Ca per GRapi unit = 1.92 (%)

Estimated Radioactivity from Phillipsite-Ca - barely detectable

Phillipsite-Ca Classification

Dana Class:

77.01.03.06a (77)Tectosilicate Zeolite group

(77.01)true zeolites

(77.01.03)Gismondine and related species

77.01.03.01 Gismondine Ca2Al4Si4O16•9(H2O) P 2₁/c 2/m

77.01.03.02 Amicite K2Na2Al4Si4O16•5(H2O) I2 2

77.01.03.03 Garronite Na2Ca5Al12Si20O64•27(H2O) I 4₁/a 4/m

77.01.03.04 Gobbinsite (Na2,Ca)2K2Al6Si10O32•12(H2O) P mn2₁ mm2

77.01.03.05 Harmotome (Ba,Na,K)1-2(Si,Al)8O16•6(H2O) P 2₁/m 2/m

77.01.03.06 Phillipsite-Na (Na,K,Ca)1-2(Si,Al)8O16•6(H2O) P 2₁/m 2/m

77.01.03.06a Phillipsite-Ca! (Ca,K,Na)1-2(Si,Al)8O16•6(H2O) P 2₁/m 2/m

77.01.03.06b Phillipsite-K! (K,Na,Ca)1-2(Si,Al)8O16•6(H2O) P 2₁/m 2/m

77.01.03.08 Perlialite K8Tl4Al12Si24O72•20(H2O) P 6/mmm 6/m 2/m 2/m

77.01.03.09 Paulingite-K (K2,Ca,Na2,Ba)5Al10Si35O90•45(H2O) Im3m 4/m 3 2/m

77.01.03.09a Paulingite-Na! (Na2,K2,Ca,Ba)5Al10Si35O90•45(H2O) Im3m 4/m 3 2/m

77.01.03.09b Paulingite-Ca! (Ca,K,Na,Ba)5[Al10Si35O84]•34(H2O) Im3m 4/m 3 2/m

77.01.03.10 Mazzite-Mg K2CaMg2(Al,Si)36O72•28(H2O) P 6₃/mmc 6/m 2/m 2/m

77.01.03.10a Mazzite-Na! Na8Al8Si28O72•30H2O P 6₃/mmc 6/m 2/m 2/m

77.01.03.11 Merlinoite (K,Ca,Na,Ba)7Si23Al9O64•23(H2O) I mmm 2/m 2/m 2/m

77.01.03.12 Montesommaite (K,Na)9Al9Si23O64•10(H2O) F dd2 mm2

Strunz Class:

09.GC.10 09 - SILICATES (Germanates)

09.G - Tektosilicates with Zeolitic H2O

09.GC -Chains of doubly-connected 4-membered rings

09.GC.10 Harmotome (Ba,Na,K)1-2(Si,Al)8O16•6(H2O) P 2₁/m 2/m

09.GC.10 Phillipsite-Na (Na,K,Ca)1-2(Si,Al)8O16•6(H2O) P 2₁/m 2/m

09.GC.10 Phillipsite-Ca! (Ca,K,Na)1-2(Si,Al)8O16•6(H2O) P 2₁/m 2/m

09.GC.10 Phillipsite-K! (K,Na,Ca)1-2(Si,Al)8O16•6(H2O) P 2₁/m 2/m

Other Phillipsite-Ca Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Phillipsite-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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Phillipsite-Ca

(Ca,K,Na)1-2(Si,Al)8O16•6(H2O)
Dana No: 77.01.03.06a Strunz No: 09.GC.10
Locality:

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