Challacolloite Mineral Data

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General Challacolloite Information

Chemical Formula:

KPb2Cl5

Composition:

Molecular Weight = 630.83 gm

Potassium 6.32 % K 7.62 % K₂O

Lead 65.69 % Pb 73.30 % Pb₂O₃

Chlorine 27.99 % Cl 27.99 % Cl

- % Cl -6.32 % -O=Cl₂

______ ______

100.00 % 102.59 % = TOTAL OXIDE

Empirical Formula:

K_1.02Pb₂Cl_4.98

Environment:

Intergrown with cotunnite (PbCl2) and a mixture of boleite and pseudoboleite in aggregates up to 4 mm in size.

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

Challacollo Silver mine, south east of Iquique, Atacama desert, northern Chile. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

IMA2004-028

Challacolloite Image

Images:

Challacolloite

Comments: White to transparent challacolloite crystals on matrix.
Location: Eruption of 1855, Mount Vesuvius, Campania, Italy. Scale: See Image.
© Jeff Weissman / Photographic Guide to Mineral Species

Challacolloite Crystallography

Axial Ratios:

a:b:c =1.1174:1:1.5747

Cell Dimensions:

a = 8.864, b = 7.932, c = 12.491, Z = 4; beta = 90.153° V = 878.23 Den(Calc)= 4.77

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 3.686(1), 3.609(0.49), 2.669(0.42),8.855(0.39), 3.961(0.31), 2.548(0.18), 2.095(0.16), 5.335(0.14), 2.215(0.13),

Physical Properties of Challacolloite

Color:

Colorless, White.

Fracture:

Brittle - Subconchoidal - Brittle frature with subconchoidal fragments

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Hardness:

2-3 - Gypsum-Calcite

Luster:

Adamantine - Greasy

Streak:

white

Optical Properties of Challacolloite

Optical Data:

Biaxial (+), a=2.004, b=2.01, g=2.024, bire=0.0200

Calculated Properties of Challacolloite

Electron Density:

Bulk Density (Electron Density)=4.05 gm/cc
note: Specific Gravity of Challacolloite =4.77 gm/cc.

Fermion Index:

Fermion Index = 0.14
Boson Index = 0.86

Photoelectric:

PE_{Challacolloite}=1,189.48 barns/electron
U=PE_{Challacolloite} x r_electron=4,821.56 barns/cc.

Radioactivity:

GRapi = 77.53 (Gamma Ray American Petroleum Institute Units)
Concentration of Challacolloite per GRapi unit = 1.29 (%)

Estimated Radioactivity from Challacolloite - barely detectable

Challacolloite Classification

Dana Class:

11.05.08.01 (11)Halide Complexes; Alumino-fluorides

(11.05)where (A)m B (X)6

(11.05.08)Challacolloite Group

11.05.08.01 Challacolloite! KPb2Cl5 P 2₁/c 2/m

11.05.08.02 Hephaistosite! TlPb2Cl5 P 2₁/c 2/m

11.05.08.03 Steropesite! Tl3BiCl6 Cc m

11.05.08.04 Panichiite! (NH4)2SnCl6 Fm3m 4 3m

Strunz Class:

03.AA.55 03 - HALIDES

03.A - Simple Halides, Without H2O

03.AA -M:X = 1:1, 2:3, 3:5, etc.

03.AA.55 Challacolloite! KPb2Cl5 P 2₁/c 2/m

03.AA.55 Hephaistosite! TlPb2Cl5 P 2₁/c 2/m

Other Challacolloite Information

References:

NAME( AmMin, v91, p1452) PHYS. PROP.(AmMin, v91, p1452) OPTIC PROP.(AmMin, v91, p1452)

See Also:

Links to other databases for Challacolloite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Challacolloite using:

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Ask about Challacolloite here :
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Mindat.org's Discussion Groups
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Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Challacolloite

KPb2Cl5
Dana No: 11.05.08.01 Strunz No: 03.AA.55
Locality:

Notes: