Goosecreekite Mineral Data

Goosecreekite Mineral Data +

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General Goosecreekite Information

Chemical Formula:

CaAl2Si6O16·5(H2O)

Composition:

Molecular Weight = 608.62 gm

Calcium 6.59 % Ca 9.21 % CaO

Aluminum 8.87 % Al 16.75 % Al₂O₃

Silicon 27.69 % Si 59.23 % SiO₂

Hydrogen 1.66 % H 14.80 % H₂O

Oxygen 55.20 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaAl₂Si₆O₁₆·5(H₂O)

Environment:

A late-stage mineral in vugs and fractures in a Triassic diabase.

IMA Status:

Approved IMA 1980

Locality:

In the Goose Creek quarry, Leesburg, Loudoun County, Virginia, USA. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 202114

PDF 35-469

Goosecreekite Image

Images:

Goosecreekite

Comments: Large cluster of many rosettes of white goosecreekite.
Location: Jalgaon, Maharashtra, India. Scale: 15x14x7 cm.
© John Betts - Fine Minerals

Goosecreekite Crystallography

Axial Ratios:

a:b:c =0.4243:1:0.4182

Cell Dimensions:

a = 7.401, b = 17.439, c = 7.293, Z = 2; beta = 105.44° V = 907.31 Den(Calc)= 2.23

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 2₁

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

By Intensity(I/I_o): 4.53(1), 5.59(0.5), 7.19(0.5),

Crystal Structure:

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Rouse R C , Peacor D R , American Mineralogist , 71 (1986) p.1494-1501, Crystal structure of the zeolite mineral goosecreekite, CaAl2Si6O16.5H2O

Physical Properties of Goosecreekite

Cleavage:

[010] Perfect

Color:

Colorless, White.

Density:

2.21

Diaphaniety:

Transparent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Goosecreekite

Gladstone-Dale:

CI meas= 0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2235,KPDmeas= 0.2255,KC= 0.2276

Optical Data:

Biaxial (-), a=1.495, b=1.498, g=1.502, bire=0.0070

Calculated Properties of Goosecreekite

Electron Density:

r_electron=2.24 gm/cc
note: r_{Goosecreekite}=2.21 gm/cc.

Fermion Index

Fermion Index = 0.01328
Boson Index = 0.98672

Photoelectric:

PE_{Goosecreekite}= 2.15 barns/electron
U=PE_{Goosecreekite} x r_electron= 4.82 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Goosecreekite is Not Radioactive

Goosecreekite Classification

Dana Class:

77.1.7.3 (77)Tectosilicate Zeolite group

(77.1)true zeolites

(77.1.7)Brewsterite and related species

77.1.7.1 Brewsterite-Sr (Sr,Ba)Al4Si12O32·10(H2O) P 2₁/m 2/m

77.1.7.1a Brewsterite-Ba! (Ba,Sr)Al2Si6O16·5(H2O) P 2₁/m,P 2₁ Mono

77.1.7.2 Yugawaralite CaAl2Si6O16·4(H2O) Pc m

77.1.7.3 Goosecreekite CaAl2Si6O16·5(H2O) P 2₁ 2

77.1.7.4 Roggianite Ca2[Be(OH)2Al2Si4O13]·<2·5(H2O) I 4/mcm 4/m 2/m 2/m

Strunz Class:

VIII/J.23-60 VIII - Silicates

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

VIII/J.23 - Zeolite group, Heulandite - Barium-brewsterite series

VIII/J.23-06 Heulandite-Na! (Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono

VIII/J.23-08 Heulandite-K! (K,Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 2/m

VIII/J.23-10 Heulandite-Ca (Ca,Na)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono

VIII/J.23-12 Heulandite-Sr! (Sr,Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono

VIII/J.23-18 Clinoptilolite-Na! (Na,K,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, C 2, Cm Mono

VIII/J.23-20 Clinoptilolite-K (Na,K,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, C 2, Cm Mono

VIII/J.23-22 Clinoptilolite-Ca! (Ca,Na,K)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m 2/m

VIII/J.23-26 Stilbite-Na! Na3Ca3[Al8Si28O72]·n(H2O)(n=28-32) C 2/m 2/m

VIII/J.23-30 Stilbite-Ca NaCa4[Al8Si28O72]·n(H2O)(n=28-32) C 2/m 2/m

VIII/J.23-40 Barrerite (Na,K,Ca)2Al2Si7O18·6(H2O) Amma or Ammm 2/m 2/m 2/m

VIII/J.23-50 Stellerite CaAl2Si7O18·7(H2O) F mmm 2/m 2/m 2/m

VIII/J.23-60 Goosecreekite CaAl2Si6O16·5(H2O) P 2₁ 2

VIII/J.23-70 Epistilbite CaAl2Si6O16·5(H2O) C1 1

VIII/J.23-80 Brewsterite-Sr (Sr,Ba)Al4Si12O32·10(H2O) P 2₁/m 2/m

VIII/J.23-90 Brewsterite-Ba! (Ba,Sr)Al2Si6O16·5(H2O) P 2₁/m,P 2₁ Mono

Other Goosecreekite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Goosecreekite

CaAl2Si6O16·5(H2O)
Dana No: 77.1.7.3 Strunz No: VIII/J.23-60
Locality:

Notes: