Mineralogy Database

Penfieldite Mineral Data

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General Penfieldite Information

Help on Chemical  Formula: Chemical Formula: Pb2Cl3(OH)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Pb2Cl3(OH)
Help on Environment: Environment: Secondary mineral from smelting activities and sea water contact.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1892
Help on Locality: Locality: Ancient lead slags at Laurium, Greece. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Samuel L. Penfield (1856-1905), American mineralogist and mineral chemist.
Help on Name Pronunciation: Name Pronunciation: Penfieldite + Pronunciation Say PENFIELDITE
Help on Synonym: Synonym: ICSD 81086
  PDF 22-384

Penfieldite Image

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

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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

Help on Axial Ratios: Axial Ratios: a:c = 1:4.31294
Help on Cell Dimensions: Cell Dimensions: a = 11.28, c = 48.65, Z = 36; V = 5,360.83 Den(Calc)= 6.00
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 6/mmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.73(1), 3.14(0.8), 3.31(0.6),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

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

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Physical Properties of Penfieldite

Help on Cleavage: Cleavage: {0001} Distinct
Help on Color: Color: Colorless, White, Yellowish, Bluish.
Help on Density: Density: 5.82
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Pyramidal - Crystals are shaped like pyramids.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 3-4 - Calcite-Fluorite
Help on Luster: Luster: Adamantine - Greasy
Help on Streak: Streak: white

Optical Properties of Penfieldite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (+), w=2.13, e=2.21, bire=0.0800.

Calculated Properties of Penfieldite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.00 gm/cc
note: Specific Gravity of Penfieldite =6.00 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.17
Boson Index = 0.83
Help on Photoelectric: Photoelectric: PEPenfieldite =1,421.47 barns/electron
U=PEPenfieldite x rElectron Density=7,105.18 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Penfieldite is Not Radioactive

Penfieldite Classification

Help on  Dana Class: Dana Class: (10)Oxyhalides and Hydroxyhalides
  (10.04)where (A)2 (O,OH) Xq
  (10.04.01)Dana Group Penfieldite Pb2Cl3(OH) P 6/mmm 6/m 2/m 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: 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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Dana No: Strunz No: 03.DC.15





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