Cowlesite Mineral Data

Cowlesite Mineral Data +

General Cowlesite Information

Chemical Formula:

CaAl2Si3O10·5-6(H2O)

Composition:

Molecular Weight = 446.38 gm

Calcium 8.98 % Ca 12.56 % CaO

Aluminum 12.09 % Al 22.84 % Al₂O₃

Silicon 18.88 % Si 40.38 % SiO₂

Hydrogen 2.71 % H 24.21 % H₂O

Oxygen 57.35 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaAl₂Si₃O₁₀·6(H₂O)

Environment:

A low-silica zeolite from hydrothermal solutions in low-silica rocks.

IMA Status:

Approved IMA 1975

Locality:

Neer Road, N of Goble, Columbia County, Oregon, USA> Link to MinDat.org Location Data.

Name Origin:

Named for John George Cowles (1907-1985), American amateur mineralogist and zeolite collector.

Synonym:

IMA1975-016

Cowlesite Image

Images:

Cowlesite

Comments: Milky bluish translucent botryoidal cowlesite in vug.
Location: Goble, Columbia County, Oregon, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Cowlesite Crystallography

Axial Ratios:

a:b:c =0.759:1:0.815

Cell Dimensions:

a = 23.249, b = 30.629, c = 24.964, Z = 52; V = 17,776.71 Den(Calc)= 2.17

Crystal System:

OrthorhombicSpace Group: P 222₁, P mmm, Pmm2

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

By Intensity(I/I_o): 15.2(1), 2.964(0.35), 3.81(0.35),

Physical Properties of Cowlesite

Cleavage:

[010] Perfect

Color:

Colorless, Gray white, White.

Density:

2.14

Diaphaniety:

Transparent

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Habit:

Stellate - Occurs as spherical, radial aggregates radiating from a "star" like point.

Hardness:

5-5.5 - Apatite-Knife Blade

Luminescence:

Fluorescent.

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Cowlesite

Gladstone-Dale:

CI meas= 0.004 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2358,KPDmeas= 0.2391,KC= 0.24

Optical Data:

Biaxial (-), a=1.505-1.513, b=1.509-1.516, g=1.509-1.518, bire=0.0040-0.0050

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Cowlesite

Electron Density:

r_electron=2.19 gm/cc
note: r_Cowlesite=2.14 gm/cc.

Fermion Index

Fermion Index = 0.00921
Boson Index = 0.99079

Photoelectric:

PE_Cowlesite= 2.22 barns/electron
U=PE_Cowlesite x r_electron= 4.85 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Cowlesite is Not Radioactive

Cowlesite Classification

Dana Class:

77.1.5.8 (77)Tectosilicate Zeolite group

(77.1)true zeolites

(77.1.5)Natrolite and related species

77.1.5.1 Natrolite Na2[Al2Si3O10]·2(H2O) F dd2 mm2

77.1.5.2 Tetranatrolite? Na2[Al2Si3O10]·2(H2O) I 42d 4 2m

77.1.5.3 Paranatrolite Na2[Al2Si3O10]·3(H2O) Cc m

77.1.5.4 Mesolite Na2Ca2Al6Si9O30·8(H2O) C 2 2

77.1.5.5 Scolecite CaAl2Si3O10·3(H2O) Cc m

77.1.5.6 Edingtonite BaAl2Si3O10·4(H2O) P 2₁2₁2 2 2 2

77.1.5.7 Gonnardite Na2CaAl4Si6O20·7(H2O) I 42d 4 2m

77.1.5.8 Cowlesite CaAl2Si3O10·5-6(H2O) P 222₁, P mmm, Pmm2 Ortho

77.1.5.9 Thomsonite-Ca NaCa2Al5Si5O20·6(H2O) Pncn 2/m 2/m 2/m

77.1.5.10 Thomsonite-Sr! (Sr,Ca)2Na[Al5Si5O20]·7(H2O) Pcnn 2/m 2/m 2/m

77.1.5.11 Nabesite! Na2BeSi4O10·4(H2O) P 2₁2₁2₁ 2 2 2

Strunz Class:

VIII/J.24-10 VIII - Silicates

VIII/J - Tectosilicates (network), with zeolite-structure, Bladed Zeolites

VIII/J.24 - Zeolite group, Cowlesite series

VIII/J.24-10 Cowlesite CaAl2Si3O10·5-6(H2O) P 222₁, P mmm, Pmm2 Ortho

Other Cowlesite Information

References:

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

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Cowlesite

CaAl2Si3O10·5-6(H2O)
Dana No: 77.1.5.8 Strunz No: VIII/J.24-10
Locality:

Notes: