Phosgenite Mineral Data

General Phosgenite Information

Chemical Formula:

Pb2(CO3)Cl2

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

Empirical Formula:

Pb₂(CO₃)Cl₂

IMA Status:

Valid Species (Pre-IMA) 1841

Locality:

Tsumeb near Otavi, Niambia. Link to MinDat.org Location Data.

Name Origin:

Named from the composition phosgene (COCl2), as the mineral contains this compound.

Name Pronunciation:

Phosgenite + Pronunciation

Synonym:

Cromfordite

Horn Lead

ICSD 4240

PDF 12-218

Phosgenite Image

Images:

Phosgenite

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

Images:

Phosgenite

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

Axial Ratios:

a:c = 1:1.08653

Cell Dimensions:

a = 8.112, c = 8.814, Z = 4; V = 580.00 Den(Calc)= 6.24

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/mbm

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

By Intensity(I/I_o): 2.79(1), 2.56(0.8), 3.61(0.8),

Forms:

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

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Crystal Structure:

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Giuseppetti G , Tadini C , Tschermaks Mineralogische und Petrographische Mitteilungen , 21 (1974) p.101-109, Reexamination of the crystal structure of phosgenite, Pb2Cl2(CO3), Locality: Monteponi Mine, Iglesias, Iglesiente district, Cagliari Province, Sardinia, Italy

Physical Properties of Phosgenite

Cleavage:

{110} Good, {001} Good, {010} Indistinct

Color:

White, Gray, Brownish yellow, Greenish white, Pinkish white.

Density:

6 - 6.3, Average = 6.15

Diaphaneity:

Transparent to translucent

Fracture:

Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2.5-3 - Finger Nail-Calcite

Luminescence:

Weakly Fluorescent, Short UV=weak yellow-orange, Long UV=yellow-orange.

Luster:

Adamantine

Streak:

white

Optical Properties of Phosgenite

Dichroism (e):

reddish.

Dichroism (w):

greenish.

Optical Data:

Uniaxial (+), w=2.114, e=2.14, bire=0.0260.

Calculated Properties of Phosgenite

Electron Density:

Bulk Density (Electron Density)=5.22 gm/cc
note: Specific Gravity of Phosgenite =6.24 gm/cc.

Fermion Index:

Fermion Index = 0.16
Boson Index = 0.84

Photoelectric:

PE_Phosgenite=1,396.07 barns/electron
U=PE_Phosgenite x rElectron Density=7,284.66 barns/cc.

Radioactivity:

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

Phosgenite Classification

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

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

References:

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

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
19 - WWW-MINCRYST

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Ask about Phosgenite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Phosgenite Specimen Label here :

Phosgenite

Pb2(CO3)Cl2
Dana No: 16a.03.04.01 Strunz No: 05.BE.20
Locality:

Notes: