Creaseyite Mineral Data

General Creaseyite Information

Chemical Formula:

Pb2Cu2(Fe+++,Al)2Si5O17•6(H2O)

Composition:

Molecular Weight = 1,166.48 gm

Aluminum 0.58 % Al 1.09 % Al₂O₃

Iron 8.38 % Fe 11.98 % Fe₂O₃

Copper 10.90 % Cu 13.64 % CuO

Silicon 12.04 % Si 25.75 % SiO₂

Hydrogen 1.04 % H 9.27 % H₂O

Lead 35.53 % Pb 38.27 % PbO

Oxygen 31.55 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₂Cu₂Fe³⁺_1.75Al_0.25Si₅O₁₇•6(H₂O)

Environment:

Found in the oxidation zones.

IMA Status:

Approved IMA 1975

Locality:

Mammoth mine, Tiger, Pinal County, Arizona, USA. Link to MinDat.org Location Data.

Name Origin:

Named for S. C. Creasey (1917-), in recognition of his studies of the Mammoth-St. Anthony mine.

Creaseyite Image

Images:

Creaseyite

Comments: Sparse light green micro crystalline creaseyite on crystalline quartz.
Location: Navajoa, Sonora, Mexico. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Creaseyite

Comments: Green acicular sprays of creaseyite to 0.5mm on matrix.
Location: Rawhide mine, Mohave County, Arizona, USA. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Creaseyite Crystallography

Axial Ratios:

a:b:c =0.584:1:0.3407

Cell Dimensions:

a = 12.483, b = 21.375, c = 7.283, Z = 4; V = 1,943.28 Den(Calc)= 3.99

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P mmm

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

By Intensity(I/I_o): 10.726(1), 3.013(0.6), 6.024(0.5),

Physical Properties of Creaseyite

Color:

Green, Yellowish green.

Density:

4.1

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

2.5 - Finger Nail

Streak:

light green

Optical Properties of Creaseyite

Gladstone-Dale:

CI meas= 0.081 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.055 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1881,KPDmeas= 0.1831,KC= 0.1992
Ncalc = 1.79 - 1.82

Optical Data:

Biaxial (+), a=1.737, b=1.747, g=1.768, bire=0.0310, 2V(Calc)=70, 2V(Meas)=69.

Pleochroism (x):

pale yellowish green.

Pleochroism (y):

yellowish green.

Pleochroism (z):

yellowish green.

Calculated Properties of Creaseyite

Electron Density:

Bulk Density (Electron Density)=3.67 gm/cc
note: Specific Gravity of Creaseyite =3.99 gm/cc.

Fermion Index:

Fermion Index = 0.08
Boson Index = 0.92

Photoelectric:

PE_Creaseyite= 600.78 barns/electron
U=PE_Creaseyite x rElectron Density=2,206.03 barns/cc.

Radioactivity:

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

Creaseyite Classification

Dana Class:

78.07.02.01 (78)Unclassified silicates

(78.07)wholly unclassified silicates

(78.07.02)Dana Group

78.07.02.01 Creaseyite Pb2Cu2(Fe,Al)2Si5O17•6(H2O) P mmm 2/m 2/m 2/m

Strunz Class:

09.HH.15 09 - SILICATES (Germanates)

09.H - Unclassified Silicates

09.HH -With Pb

09.HH.15 Creaseyite Pb2Cu2(Fe,Al)2Si5O17•6(H2O) P mmm 2/m 2/m 2/m

Other Creaseyite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Creaseyite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Creaseyite

Pb2Cu2(Fe+++,Al)2Si5O17•6(H2O)
Dana No: 78.07.02.01 Strunz No: 09.HH.15
Locality:

Notes:

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