Goosecreekite Mineral Data

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.

Name Pronunciation:

Goosecreekite + Pronunciation

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 - Sphenoidal H-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),

Physical Properties of Goosecreekite

Cleavage:

{010} Perfect

Color:

Colorless, White.

Density:

2.21

Diaphaneity:

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
Ncalc = 1.5 - 1.51

Optical Data:

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

Calculated Properties of Goosecreekite

Electron Density:

Bulk Density (Electron Density)=2.24 gm/cc
note: Specific Gravity of Goosecreekite =2.21 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Goosecreekite is Not Radioactive

Goosecreekite Classification

Dana Class:

77.01.07.03 (77)Tectosilicate Zeolite group

(77.01)true zeolites

(77.01.07)Brewsterite and related species

77.01.07.01 Brewsterite-Sr (Sr,Ba)Al4Si12O32•10(H2O) P 2₁/m 2/m

77.01.07.01a Brewsterite-Ba! (Ba,Sr)Al2Si6O16•5(H2O) P 2₁/m,P 2₁ Mono

77.01.07.02 Yugawaralite CaAl2Si6O16•4(H2O) Pc m

77.01.07.03 Goosecreekite CaAl2Si6O16•5(H2O) P 2₁ 2

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

Strunz Class:

09.GB.25 09 - SILICATES (Germanates)

09.G - Tektosilicates with Zeolitic H2O

09.GB -Chains of single connected 4-membered rings

09.GB.25 Goosecreekite CaAl2Si6O16•5(H2O) P 2₁ 2

Other Goosecreekite Information

References:

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

See Also:

Links to other databases for Goosecreekite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST
17 - Zeolite Database by Bruno Herreros

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Goosecreekite

CaAl2Si6O16•5(H2O)
Dana No: 77.01.07.03 Strunz No: 09.GB.25
Locality:

Notes:

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