Mineralogy Database

Phosgenite Mineral Data

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General Phosgenite Information

Help on Chemical  Formula: Chemical Formula: Pb2(CO3)Cl2
Help on Composition: Composition: Molecular Weight = 545.31 gm
   Lead      75.99 %  Pb   87.73 % PbO2
   Carbon     2.20 %  C     8.07 % CO2
   Chlorine  13.00 %  Cl   13.00 % Cl
               -   %   Cl   -2.93 % -O=Cl2   
   Oxygen     8.80 %  O
            ______        ______ 
            100.00 %      105.87 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb2(CO3)Cl2
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1841
Help on Locality: Locality: Tsumeb near Otavi, Niambia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the composition phosgene (COCl2), as the mineral contains this compound.
Help on Name Pronunciation: Name Pronunciation: Phosgenite + Pronunciation Say PHOSGENITE
Help on Synonym: Synonym: Cromfordite
  Horn Lead
  ICSD 4240
  PDF 12-218

Phosgenite Image

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Comments: Clear pseudo-cubic crystals of phosgenite on matrix.
Location: Laurium, Greece. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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Comments: Terminated, very large crystal of partly transparent, deep brown phosgenite.
Location: Touissit, Morocco. Scale: 7.1x5.5x2.4 cm.
© Richard Dale / Dale Minerals

Phosgenite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.08653
Help on Cell Dimensions: Cell Dimensions: a = 8.112, c = 8.814, Z = 4; V = 580.00 Den(Calc)= 6.24
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 4/mbm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.79(1), 2.56(0.8), 3.61(0.8),
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: ( 0 1 1) ( 1 1 0) ( 1 1 1) ( 0 0 1)

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Physical Properties of Phosgenite

Help on Cleavage: Cleavage: {110} Good, {001} Good, {010} Indistinct
Help on Color: Color: White, Gray, Brownish yellow, Greenish white, Pinkish white.
Help on Density: Density: 6 - 6.3, Average = 6.15
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luminescence: Luminescence: Weakly Fluorescent, Short UV=weak yellow-orange, Long UV=yellow-orange.
Help on Luster: Luster: Adamantine
Help on Streak: Streak: white

Optical Properties of Phosgenite

Help on Dichroism (e): Dichroism (e): reddish.
Help on Dichroism (w): Dichroism (w): greenish.
Help on Optical Data: Optical Data: Uniaxial (+), w=2.114, e=2.14, bire=0.0260.

Calculated Properties of Phosgenite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.22 gm/cc
note: Specific Gravity of Phosgenite =6.24 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.16
Boson Index = 0.84
Help on Photoelectric: Photoelectric: PEPhosgenite =1,396.07 barns/electron
U=PEPhosgenite x rElectron Density=7,284.66 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Phosgenite is Not Radioactive

Phosgenite Classification

Help on  Dana Class: Dana Class: 16a.03.04.01 (16a)Carbonates - Hydroxyl or Halogen
  (16a.03)where (A B)2 (XO3) Zq
  (16a.03.04)Dana Group
16a.03.04.01 Phosgenite Pb2(CO3)Cl2 P 4/mbm 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 05.BE.20 05 - CARBONATES (NITRATES)
  05.B - Carbonates with additional anions, without H2O
  05.BE -With Pb, Bi
05.BE.20 Phosgenite Pb2(CO3)Cl2 P 4/mbm 4/m 2/m 2/m

Other Phosgenite 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 Phosgenite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - HyperPhysics
12 - HyperPhysics
13 - MinDAT
14 - Mineral and Gemstone Kingdom
15 - Mineralienatlas (Deutsch)
16 - Online Mineral Museum
17 - QUT Mineral Atlas
18 - Ruff.Info

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Dana No: 16a.03.04.01 Strunz No: 05.BE.20





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