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Challacolloite Mineral Data
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General Challacolloite Information
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 Chemical Formula: |
KPb2Cl5 |
| Composition: |
Molecular Weight = 630.83 gm |
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Potassium 6.32 % K 7.62 % K2O |
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Lead 65.69 % Pb 73.30 % Pb2O3 |
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Chlorine 27.99 % Cl 27.99 % Cl |
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- %
Cl -6.32 % -O=Cl2 |
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______ ______ |
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100.00 % 102.59 % = TOTAL OXIDE |
| Empirical Formula: |
K1.02Pb2Cl4.98 |
| 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 |
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Challacolloite Image |
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Images:
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Challacolloite Crystallography
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| 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 - Prismatic H-M Symbol (2/m) Space Group: P 21/c |
| 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), |
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Physical Properties of Challacolloite
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| 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 |
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Optical Properties of Challacolloite
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| Optical Data: |
Biaxial (+), a=2.004, b=2.01, g=2.024, bire=0.0200 |
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Calculated Properties of Challacolloite
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| Electron Density: |
Bulk Density (Electron Density)=4.05 gm/cc
note: Specific Gravity of Challacolloite =4.77 gm/cc.
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| Fermion Index: |
Fermion Index = 0.14
Boson Index = 0.86 |
| Photoelectric: |
PEChallacolloite =1,189.48 barns/electron
U=PEChallacolloite x relectron=4,821.56 barns/cc.
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| Radioactivity: |
GRapi = 77.53 (Gamma Ray American Petroleum Institute Units)
Concentration of Challacolloite per GRapi unit = 1.29 (%)
Estimated Radioactivity from Challacolloite  - barely detectable
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Challacolloite Classification
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| Dana Class: |
11.05.08.01 (11)Halide Complexes; Alumino-fluorides |
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(11.05)where (A)m B (X)6 |
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(11.05.08)Challacolloite Group |
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11.05.08.01 Challacolloite! KPb2Cl5 P 21/c 2/m |
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11.05.08.02 Hephaistosite! TlPb2Cl5 P 21/c 2/m |
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11.05.08.03 Steropesite! Tl3BiCl6 Cc m |
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11.05.08.04 Panichiite! (NH4)2SnCl6 Fm3m 4 3m |
| Strunz Class: |
03.AA.55 03 - HALIDES |
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03.A - Simple Halides, Without H2O |
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03.AA -M:X = 1:1, 2:3, 3:5, etc. |
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03.AA.55 Challacolloite! KPb2Cl5 P 21/c 2/m |
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03.AA.55 Hephaistosite! TlPb2Cl5 P 21/c 2/m |
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Other Challacolloite Information
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| 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
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Print or Cut-and-Paste your Challacolloite Specimen Label here :
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Challacolloite
KPb2Cl5
Dana No: 11.05.08.01 Strunz No: 03.AA.55
Locality:
Notes:
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