Mineralogy Database

Challacolloite Mineral Data

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General Challacolloite Information

Help on Chemical  Formula: Chemical Formula: KPb2Cl5
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: K1.02Pb2Cl4.98
Help on Environment: Environment: Intergrown with cotunnite (PbCl2) and a mixture of boleite and pseudoboleite in aggregates up to 4 mm in size.
Help on IMA Status: IMA Status: Approved IMA 2004 (Dana # Added)
Help on Locality: Locality: Challacollo Silver mine, south east of Iquique, Atacama desert, northern Chile. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Synonym: Synonym: IMA2004-028

Challacolloite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =1.1174:1:1.5747
Help on Cell Dimensions: Cell Dimensions: a = 8.864, b = 7.932, c = 12.491, Z = 4; beta = 90.153° V = 878.23 Den(Calc)= 4.77
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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

Help on Color: Color: Colorless, White.
Help on Fracture: Fracture: Brittle - Subconchoidal - Brittle frature with subconchoidal fragments
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luster: Luster: Adamantine - Greasy
Help on Streak: Streak: white

Optical Properties of Challacolloite

Help on Optical Data: Optical Data: Biaxial (+), a=2.004, b=2.01, g=2.024, bire=0.0200

Calculated Properties of Challacolloite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.05 gm/cc
note: Specific Gravity of Challacolloite =4.77 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.14
Boson Index = 0.86
Help on Photoelectric: Photoelectric: PEChallacolloite =1,189.48 barns/electron
U=PEChallacolloite x relectron=4,821.56 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: Dana Class: (11)Halide Complexes; Alumino-fluorides
  (11.05)where (A)m B (X)6
  (11.05.08)Challacolloite Group Challacolloite! KPb2Cl5 P 21/c 2/m Hephaistosite! TlPb2Cl5 P 21/c 2/m Steropesite! Tl3BiCl6 Cc m Panichiite! (NH4)2SnCl6 Fm3m 4 3m
Help on  Strunz Class: 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

Help on References: References: NAME( AmMin, v91, p1452) PHYS. PROP.(AmMin, v91, p1452) OPTIC PROP.(AmMin, v91, p1452)
Help on See Also: 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

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Dana No: Strunz No: 03.AA.55





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