Gilalite Mineral Data

General Gilalite Information

Chemical Formula:

Cu5Si6O17•7(H2O)

Composition:

Molecular Weight = 884.34 gm

Copper 35.93 % Cu 44.97 % CuO

Silicon 19.06 % Si 40.77 % SiO₂

Hydrogen 1.60 % H 14.26 % H₂O

Oxygen 43.42 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu₅Si₆O₁₇•7(H₂O)

Environment:

Garnet-diopside tactite zone.

IMA Status:

Approved IMA 1979

Locality:

Christmas mine, Gila County, Arizona, USA. Link to MinDat.org Location Data.

Name Origin:

Named for its locality.

Name Pronunciation:

Gilalite

Gilalite Image

Images:

Gilalite

Comments: Striated, prismatic pale greenish yellow crystal of gilalite.
Location: Christmas mine, Hayden, Gila County, Arizona, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Gilalite

Comments: Green spherical crystals of gilalite to 0.3mm in grape-like bunches.
Location: Christmas mine, Gila Co., Arizona, USA. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Gilalite Crystallography

Axial Ratios:

a:b:c =0.6983:1:0.471

Cell Dimensions:

a = 13.38, b = 19.16, c = 9.026, Z = 4; beta = 90° V = 2,313.91 Den(Calc)= 2.54

Crystal System:

Monoclinic Space Group: Unk

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

By Intensity(I/I_o): 13.49(1), 7.786(0.5), 10.97(0.5),

Physical Properties of Gilalite

Color:

Blue green, Green.

Density:

2.82

Diaphaneity:

Translucent

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

2 - Gypsum

Streak:

light green

Optical Properties of Gilalite

Gladstone-Dale:

CI meas= -0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.145 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2402,KPDmeas= 0.2163,KC= 0.2097
Ncalc = 1.53 - 1.59

Optical Data:

Biaxial (-), a=1.56, b=1.635, g=1.635, bire=0.0750

Calculated Properties of Gilalite

Electron Density:

Bulk Density (Electron Density)=2.77 gm/cc
note: Specific Gravity of Gilalite =2.82 gm/cc.

Fermion Index:

Fermion Index = 0.0091096061
Boson Index = 0.9908903939

Photoelectric:

PE_Gilalite= 16.17 barns/electron
U=PE_Gilalite x rElectron Density= 44.86 barns/cc.

Radioactivity:

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

Gilalite Classification

Dana Class:

78.04.04.01 (78)Unclassified silicates

(78.04)possible inosilicates

(78.04.04)Dana Group

78.04.04.01 Gilalite Cu5Si6O17•7(H2O) Unk Mono

Strunz Class:

09.HE.05 09 - SILICATES (Germanates)

09.H - Unclassified Silicates

09.HE -With Cu, Zn

09.HE.05 Gilalite Cu5Si6O17•7(H2O) Unk Mono

Other Gilalite Information

References:

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

See Also:

Links to other databases for Gilalite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Glendale Community College
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

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Print or Cut-and-Paste your Gilalite Specimen Label here :

Gilalite

Cu5Si6O17•7(H2O)
Dana No: 78.04.04.01 Strunz No: 09.HE.05
Locality:

Notes:

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