Challacolloite Mineral Data

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:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Challacolloite :

A Bijoux Google Search for Challacolloite
Adam's Minerals Google Search for Challacolloite
Cape Minerals Google Search for Challacolloite
Dakota Matrix Minerals Google Search for Challacolloite
Excalibur Mineral Corp. Google Search for Challacolloite
Exceptional Minerals Google Search for Challacolloite
John Betts Fine Minerals Search for Challacolloite
McDougall Minerals Google Search for Challacolloite
Mineral News Website Link
Rock and Mineral Shows Google Search for Challacolloite
Weinrich Minerals, Inc. Google Search for Challacolloite

Ask about Challacolloite 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 Challacolloite Specimen Label here :

Challacolloite

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

Notes: