Criddleite Mineral Data

Fabre Minerals

General Criddleite Information
Chemical Formula:	TlAg2Au3Sb10S10
Composition:	Molecular Weight = 2,549.18 gm
	Thallium   8.02 %  Tl
	Silver     8.46 %  Ag
	Antimony  47.76 %  Sb
	Gold      23.18 %  Au
	Sulfur    12.58 %  S
	______
	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 Crystallography
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 - PrismaticH-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),
Physical Properties of Criddleite
Color:	Black.
Diaphaniety:	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
Optical Properties of Criddleite
Optical Data:	NCalc= 1.42 - from Gladstone-Dale relationship (KC = 0.0615) where Ncalc=Dcalc*KC+1
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  ∑ R1(λ)   ∑ R2(λ)   400 nm   40.60   41.80       420 nm   40.10   41.00   440 nm   39.40   40.10   460 nm   38.60   39.40   480 nm   38.10   39.20   500 nm   37.60   39.10   520 nm   37.30   38.90   540 nm   36.70   38.40   560 nm   36.10   38.00   580 nm   35.60   37.60   600 nm   35.00   37.20   620 nm   34.40   36.60   640 nm   33.70   36.00   660 nm   33.10   35.30   680 nm   32.60   34.60   700 nm   32.50   34.10  Calculated Relative Intensity Colors of Criddleite in Air Relative Intensity    0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 260% R1                       R2
Calculated Properties of Criddleite
Electron Density:	relectron=5.73 gm/cc note: rCriddleite =6.75 gm/cc.
Fermion Index	Fermion Index = 0.00094 Boson Index = 0.99906
Photoelectric:	PECriddleite = 699.30 barns/electron U=PECriddleite x relectron=4,007.03 barns/cc.
Radioactivity:	GRapi = 0 (Gamma Ray American Petroleum Institute Units) Criddleite is Not Radioactive
Criddleite Classification
Dana Class:	3.9.1.1 (3)Sulfides - Sulfosalts
	(3.9)where z/y = 1 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
	(3.9.1)Dana Group
	3.9.1.1 Criddleite TlAg2Au3Sb10S10 A2/m ? 2/m
Strunz Class:	II/B.07-30 II - Sulfides and sulphosalts
	II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Sulfides, Selenides and Tellurides with predominant Copper and Silver/Gold
	II/B.07 - Petrovskaite - Muthmannite series
	II/B.07-10 Petrovskaite AuAg(S,Se) P 2/m,P 2,Pm Mono
	II/B.07-20 Uytenbogaardtite Ag3AuS2 P 4122 4 2 2
	II/B.07-30 Criddleite TlAg2Au3Sb10S10 A2/m ? 2/m
	II/B.07-40 Penzhinite (Ag,Cu)4Au(S,Se)4 P 6322 6 2 2
	II/B.07-50 Fischesserite Ag3AuSe2 I 4132 4 3 2
	II/B.07-60 Petzite Ag3AuTe2 I 4132 4 3 2
	II/B.07-70 Muthmannite AgAuTe2 P 2/m Ortho
Other Criddleite Information
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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris Search for Criddleite using:   Web webmineral.com [ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO] Visit our Advertisers for Criddleite : AA Mineral Specimens B & L Fine Minerals Crystal Vaults Dan Weinrich Fine Minerals Dan Weinrich Auctions e-Rocks Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals Rockshop.cz T G Fine Minerals Wrights Rock Shop Translate Criddleite Mineral Data : Ask about Criddleite 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 Criddleite Specimen Label here : Criddleite TlAg2Au3Sb10S10 Dana No: 3.9.1.1 Strunz No: II/B.07-30 Locality:   Notes: