Penfieldite Mineral Data

General Penfieldite Information

Chemical Formula:

Pb2Cl3(OH)

Composition:

Molecular Weight = 537.77 gm

Hydrogen 0.19 % H 1.68 % H₂O

Lead 77.06 % Pb 83.01 % PbO

Chlorine 19.78 % Cl 19.78 % Cl

- % Cl -4.46 % -O=Cl₂

Oxygen 2.98 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₂Cl₃(OH)

Environment:

Secondary mineral from smelting activities and sea water contact.

IMA Status:

Valid Species (Pre-IMA) 1892

Locality:

Ancient lead slags at Laurium, Greece. Link to MinDat.org Location Data.

Name Origin:

Named for Samuel L. Penfield (1856-1905), American mineralogist and mineral chemist.

Name Pronunciation:

Penfieldite + Pronunciation

Synonym:

ICSD 81086

PDF 22-384

Penfieldite Image

Images:

Penfieldite

Comments: Greenish, acicular penfieldite crystals.
Location: Laurium, Greece. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Penfieldite

Comments: White to clear or light blue, doubly terminated, striated penfieldite crystals from 0.5 to 2mm associated with boleite as micro coatings.
Location: Margarita mine, Sierra Gorda, Chile. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Penfieldite Crystallography

Axial Ratios:

a:c = 1:4.31294

Cell Dimensions:

a = 11.28, c = 48.65, Z = 36; V = 5,360.83 Den(Calc)= 6.00

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6/mmm

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

By Intensity(I/I_o): 3.73(1), 3.14(0.8), 3.31(0.6),

Forms:

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Forms: ( 1 1 8) ( 0 1 0) ( 0 0 1)

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Crystal Structure:

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Merlino S , Pasero M , Perchiazzi N , Gianfagna A , Mineralogical Magazine , 59 (1995) p.341-347, X-ray and electron diffraction study of penfieldite:, average structure and multiple cells, Locality: Etruscan iron slag, Baratti beach, Piombiono, Tuscany, Italy

Physical Properties of Penfieldite

Cleavage:

{0001} Distinct

Color:

Colorless, White, Yellowish, Bluish.

Density:

5.82

Diaphaneity:

Transparent

Habit:

Pyramidal - Crystals are shaped like pyramids.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3-4 - Calcite-Fluorite

Luster:

Adamantine - Greasy

Streak:

white

Optical Properties of Penfieldite

Gladstone-Dale:

CI meas= -0.126 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.092 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.195,KPDmeas= 0.201,KC= 0.1786
Ncalc = 2.04 - 2.07

Optical Data:

Uniaxial (+), w=2.13, e=2.21, bire=0.0800.

Calculated Properties of Penfieldite

Electron Density:

Bulk Density (Electron Density)=5.00 gm/cc
note: Specific Gravity of Penfieldite =6.00 gm/cc.

Fermion Index:

Fermion Index = 0.17
Boson Index = 0.83

Photoelectric:

PE_Penfieldite=1,421.47 barns/electron
U=PE_Penfieldite x rElectron Density=7,105.18 barns/cc.

Radioactivity:

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

Penfieldite Classification

Dana Class:

10.04.01.01 (10)Oxyhalides and Hydroxyhalides

(10.04)where (A)2 (O,OH) Xq

(10.04.01)Dana Group

10.04.01.01 Penfieldite Pb2Cl3(OH) P 6/mmm 6/m 2/m 2/m

Strunz Class:

03.DC.15 03 - HALIDES

03.D - Oxyhalides, Hydroxyhalides and Related Double Halides

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

03.DC.15 Penfieldite Pb2Cl3(OH) P 6/mmm 6/m 2/m 2/m

Other Penfieldite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Penfieldite :
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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Ask about Penfieldite here :
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Print or Cut-and-Paste your Penfieldite Specimen Label here :

Penfieldite

Pb2Cl3(OH)
Dana No: 10.04.01.01 Strunz No: 03.DC.15
Locality:

Notes: