Phosgenite Mineral Data

Phosgenite Mineral Data +

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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.

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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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

Diaphaniety:

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, Long UV=yellow.

Luster:

Adamantine

Streak:

white

Optical Properties of Phosgenite

Dichroism (e):

reddish.

Dichroism (w):

greenish.

Gladstone-Dale:

CI meas= -0.22 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.202 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1806,KPDmeas= 0.1833,KC= 0.1502

Optical Data:

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

Calculated Properties of Phosgenite

Electron Density:

r_electron=5.22 gm/cc
note: r_Phosgenite=6.24 gm/cc.

Fermion Index

Fermion Index = 0.16822
Boson Index = 0.83178

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Phosgenite is Not Radioactive

Phosgenite Classification

Dana Class:

16a.3.4.1 (16a)Carbonates - Hydroxyl or Halogen

(16a.3)where (A B)2 (XO3) Zq

(16a.3.4)Dana Group

16a.3.4.1 Phosgenite Pb2(CO3)Cl2 P 4/mbm 4/m 2/m 2/m

Strunz Class:

V/C.09-10 V - Nitrates, Carbonates and Borates

V/C - Waterfree carbonates with unfamiliar anions

V/C.09 - Phosgenite - Beyerite series

V/C.09-10 Phosgenite Pb2(CO3)Cl2 P 4/mbm 4/m 2/m 2/m

V/C.09-20 Bismutite Bi2(CO3)O2 Imm2 mm2

V/C.09-30 Kettnerite CaBi(CO3)OF Pmmn 2/m 2/m 2/m

V/C.09-40 Beyerite (Ca,Pb)Bi2(CO3)2O2 I mmm 2/m 2/m 2/m

Other Phosgenite Information

References:

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

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Phosgenite

Pb2(CO3)Cl2
Dana No: 16a.3.4.1 Strunz No: V/C.09-10
Locality:

Notes: