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Criddleite Mineral Data
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General Criddleite Information
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 Chemical Formula: |
TlAg2Au3Sb10S10 |
| Composition: |
Molecular Weight = 2,549.18 gm |
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Thallium 8.02 % Tl |
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Silver 8.46 % Ag |
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Antimony 47.76 % Sb |
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Gold 23.18 % Au |
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Sulfur 12.58 % S |
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______ |
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100.00 % |
| Empirical Formula: |
TlAg2Au3Sb10S10 |
| Environment: |
Primary hydrothermal mineral in a complex gold deposit. |
| IMA Status: |
Approved IMA 1988 |
| Locality: |
Hemlo gold deposit, near Marathon, Ontario, Canada. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Alan J. Criddle (1944-2002), English mineralogist. |
| Synonym: |
IMA1987-037 |
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Criddleite Image |
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Images:
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Criddleite Aurostibite
Comments: B&W polished section image of criddleite (grey) surrounding and penetrating aurostibite (white) within quartz gangue. (MinMag, v52:691).
Location: Hemlo gold deposit, Hemlo, Ontario, Canada.
Scale: See Image.
© Mineralogical Magazine |
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Criddleite Crystallography
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| Axial Ratios: |
a:b:c =2.4773:1:0.9692 |
| Cell Dimensions: |
a = 19.96, b = 8.057, c = 7.809, Z = 2; beta = 92.08° V = 1,255.00 Den(Calc)= 6.75 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: A2/m ? |
| X Ray Diffraction: |
By Intensity(I/Io): 2.813(1), 5.63(0.9), 2.86(0.7), |
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Physical Properties of Criddleite
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| Color: |
Black. |
| Diaphaneity: |
Opaque |
| Habit: |
Anhedral Grains - Granular minerals without the expression of crystal shapes |
| Habit: |
Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape. |
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
| Hardness: |
3-3.5 - Calcite-Copper Penny |
| Luster: |
Metallic |
| Streak: |
black |
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Optical Properties of Criddleite
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| Optical Data: |
NCalc= 1.42 - from Gladstone-Dale relationship (KC = 0.0615) where Ncalc=Dcalc*KC+1
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| RL Anisotrophism: |
Distinct to moderate, from buff to slate gray. |
| RL Color: |
Gray-blue. |
| RL Pleochroism: |
Weak, from gray-blue to slightly greenish gray-blue. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Criddleite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
40.60 |
41.80 |
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| 420 nm |
40.10 |
41.00 |
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| 440 nm |
39.40 |
40.10 |
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| 460 nm |
38.60 |
39.40 |
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| 480 nm |
38.10 |
39.20 |
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| 500 nm |
37.60 |
39.10 |
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| 520 nm |
37.30 |
38.90 |
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| 540 nm |
36.70 |
38.40 |
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| 560 nm |
36.10 |
38.00 |
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| 580 nm |
35.60 |
37.60 |
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| 600 nm |
35.00 |
37.20 |
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| 620 nm |
34.40 |
36.60 |
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| 640 nm |
33.70 |
36.00 |
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| 660 nm |
33.10 |
35.30 |
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| 680 nm |
32.60 |
34.60 |
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| 700 nm |
32.50 |
34.10 |
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Calculated Relative Intensity Colors of Criddleite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
240% |
260% |
| R1 |
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| R2 |
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Calculated Properties of Criddleite
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| Electron Density: |
Bulk Density (Electron Density)=5.73 gm/cc
note: Specific Gravity of Criddleite =6.75 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0009434213
Boson Index = 0.9990565787 |
| Photoelectric: |
PECriddleite = 699.30 barns/electron
U=PECriddleite x rElectron Density=4,007.03 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Criddleite is Not Radioactive |
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Criddleite Classification
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| Dana Class: |
03.09.01.01 (03)Sulfides - Sulfosalts |
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(03.09)where z/y = 1 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.09.01)Dana Group |
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03.09.01.01 Criddleite TlAg2Au3Sb10S10 A2/m ? 2/m |
| Strunz Class: |
02.LA.25 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.L - Unclassified Sulfosalts |
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02.LA -Without essential Pb |
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02.LA.25 Criddleite TlAg2Au3Sb10S10 A2/m ? 2/m |
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Other Criddleite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.75,p706-713,1990) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Criddleite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
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Criddleite
TlAg2Au3Sb10S10
Dana No: 03.09.01.01 Strunz No: 02.LA.25
Locality:
Notes:
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