Pinalite Mineral Data

General Pinalite Information

Chemical Formula:

Pb3(WO4)OCl2

Composition:

Molecular Weight = 956.35 gm

Lead 65.00 % Pb 70.02 % PbO

Tungsten 19.22 % W 24.24 % WO₃

Chlorine 7.41 % Cl 7.41 % Cl

- % Cl -1.67 % -O=Cl₂

Oxygen 8.36 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₃(WO₄)OCl₂

Environment:

In solution cavities in quartz.

IMA Status:

Approved IMA 1989

Locality:

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

Name Origin:

Named for the locality.

Name Pronunciation:

Pinalite

Synonym:

ICSD 89833

PDF 46-1395

Pinalite Image

Images:

Pinalite

Comments: Yellow needles of pinalite from 0.2 to 0.5mm in rose quartz and blue caledonite.
Location: Tiger, Pinal County, Arizona, USA. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Pinalite Crystallography

Axial Ratios:

a:b:c =0.8474:1:0.4298

Cell Dimensions:

a = 11.073, b = 13.067, c = 5.617, Z = 4; V = 812.73 Den(Calc)= 7.82

Crystal System:

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

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

By Intensity(I/I_o): 2.926(1), 3.778(0.9), 1.642(0.5),

Physical Properties of Pinalite

Cleavage:

None

Color:

Yellow, Orangish, Golden yellow.

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Luminescence:

Non-fluorescent.

Luster:

Adamantine

Optical Properties of Pinalite

Gladstone-Dale:

CI calc= -0.211 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1914,KC= 0.158
Ncalc = 2.24

Optical Data:

Biaxial (+), a=2.49, b=2.495, g=2.505, bire=0.0150, 2V(Calc)=72, 2V(Meas)=70-70.5. Dispersion r > v moderate.

Pleochroism (x):

none.

Pleochroism (y):

none.

Pleochroism (z):

none.

Calculated Properties of Pinalite

Electron Density:

Bulk Density (Electron Density)=6.44 gm/cc
note: Specific Gravity of Pinalite =7.82 gm/cc.

Fermion Index:

Fermion Index = 0.17
Boson Index = 0.83

Photoelectric:

PE_Pinalite=1,463.24 barns/electron
U=PE_Pinalite x rElectron Density=9,428.25 barns/cc.

Radioactivity:

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

Pinalite Classification

Dana Class:

10.02.09.01 (10)Oxyhalides and Hydroxyhalides

(10.02)where A (O,OH) Xq

(10.02.09)Dana Group

10.02.09.01 Pinalite Pb3(WO4)OCl2 Amam 2/m 2/m 2/m

Strunz Class:

03.DC.55 03 - HALIDES

03.D - Oxyhalides, Hydroxyhalides and Related Double Halides

03.DC -With Pb (As,Sb,Bi), without Cu

03.DC.55 Pinalite Pb3(WO4)OCl2 Amam 2/m 2/m 2/m

Other Pinalite Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.74,p934-935,1989) OPTIC PROP.(Dana8)

See Also:

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

Pinalite

Pb3(WO4)OCl2
Dana No: 10.02.09.01 Strunz No: 03.DC.55
Locality:

Notes:

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