Sieleckiite Mineral Data

General Sieleckiite Information

Chemical Formula:

Cu3Al4(PO4)2(OH)12•2(H2O)

Composition:

Molecular Weight = 728.63 gm

Aluminum 14.81 % Al 27.99 % Al₂O₃

Copper 26.16 % Cu 32.75 % CuO

Phosphorus 8.50 % P 19.48 % P₂O₅

Hydrogen 2.21 % H 19.78 % H₂O

Oxygen 48.31 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu₃Al₄(PO₄)₂(OH)₁₂•2(H₂O)

Environment:

Oxidation zone of massive pyrite enriched with Cu.

IMA Status:

Approved IMA 1988

Locality:

Mt. Oxide Cu mine, 150 km N of Mt. Isa, Queensland, Australia. Link to MinDat.org Location Data.

Name Origin:

Named for Robert Sielecki (1958-), Australian geologist.

Name Pronunciation:

Sieleckiite + Pronunciation

Sieleckiite Image

Images:

Sieleckiite

Comments: SEM image showing a hemisphere of sieleckiite on variscite crystals. (MinMag, 52:515).
Location: Mt Oxide Copper Mine, 150 km north of Mt Isa, Queensland, Australia. Scale: Sphere Diameter 0.4 mm.
© Mineralogical Magazine

Sieleckiite Crystallography

Axial Ratios:

a:b:c =1.2447:1:0.787

Cell Dimensions:

a = 9.41, b = 7.56, c = 5.95, Z = 1; alpha = 90.25°, beta = 91.27°, gamma = 104.02° V = 410.57 Den(Calc)= 2.95

Crystal System:

Triclinic Space Group: P1 or P1

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

By Intensity(I/I_o): 3.852(1), 5.036(1), 9.12(1),

Physical Properties of Sieleckiite

Cleavage:

None

Color:

Sky blue, Royal blue.

Density:

3.02

Diaphaneity:

Translucent

Fracture:

Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.

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:

3 - Calcite

Luminescence:

Non-fluorescent.

Luster:

Pearly

Streak:

light blue

Optical Properties of Sieleckiite

Gladstone-Dale:

CI meas= 0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2186,KPDmeas= 0.2136,KC= 0.2165
Ncalc = 1.64 - 1.65

Optical Data:

Biaxial (?), a=1.63, g=1.66, bire=0.0300

Pleochroism (x):

colorless.

Pleochroism (y):

pale blue.

Pleochroism (z):

pale blue.

Calculated Properties of Sieleckiite

Electron Density:

Bulk Density (Electron Density)=2.92 gm/cc
note: Specific Gravity of Sieleckiite =2.95 gm/cc.

Fermion Index:

Fermion Index = 0.0002352
Boson Index = 0.9997648

Photoelectric:

PE_Sieleckiite= 12.02 barns/electron
U=PE_Sieleckiite x rElectron Density= 35.15 barns/cc.

Radioactivity:

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

Sieleckiite Classification

Dana Class:

42.13.12.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.13)Dana Type

(42.13.12)Dana Group

42.13.12.01 Sieleckiite Cu3Al4(PO4)2(OH)12•2(H2O) P1 or P1 Tri

Strunz Class:

08.DF.25 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DF -With only medium-sized cations, (OH,etc.):RO4 > 3:1

08.DF.25 Sieleckiite Cu3Al4(PO4)2(OH)12•2(H2O) P1 or P1 Tri

Other Sieleckiite Information

References:

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

See Also:

Links to other databases for Sieleckiite :
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 Sieleckiite Specimen Label here :

Sieleckiite

Cu3Al4(PO4)2(OH)12•2(H2O)
Dana No: 42.13.12.01 Strunz No: 08.DF.25
Locality:

Notes:

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