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Criddleite

Formula:
TlAg
 
2
Au
 
3
Sb
 
10
S
 
10
System:MonoclinicColour:Gray-blue
Hardness:3 - 3½
Name:
For Dr Alan J Criddle (1944-2002), mineralogist at the British Museum
This page provides mineralogical data about Criddleite.

Classification of Criddleite

IMA status:Approved 1987
Strunz 8th edition ID:2/B.07-30
Strunz 9th edition ID:2.00.X
Nickel-Strunz 10th (pending) edition ID:2.LA.25

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
L : Unclassified Sulfosalts
A : Without essential Pb
Dana 8th edition ID:3.9.1.1

3 : SULFOSALTS
9 : ø = 1
Hey's CIM Ref.:5.5.19

5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
5 : Sulpharsenites etc. of Tl
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Type Occurrence of Criddleite

Type Locality:Hemlo Mines, Hemlo gold deposit, Marathon, Thunder Bay District, Ontario, Canada
Place of Conservation of Type Material:British Museum Natural History
Geological Setting of type material:Primary hydrothermal mineral

Physical Properties of Criddleite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:Gray-blue
Streak:Black
Hardness (Mohs):3 - 3½
Hardness (Vickers):VHN25=94 - 129 kg/mm2
Density (measured):6.86(7) g/cm3
Density (calculated):6.57 g/cm3

Crystallography of Criddleite

Crystal System:Monoclinic
Cell Parameters:a = 20.01Å, b = 8.07Å, c = 7.83Å
β = 92.01°
Ratio:a:b:c = 2.48 : 1 : 0.97
Unit Cell Volume:V 1,263.62 ų (Calculated from Unit Cell)
Morphology:Lath like grains to 70 microns.
Twinning:Common

Optical Data of Criddleite

Type:Anisotropic
Anisotropism:Distinct - from buff to slate gray
Colour in reflected light:Gray-blue
Pleochroism:Weak
Comments:From gray-blue to slightly greenish gray-blue

Chemical Properties of Criddleite

Formula:
TlAg
 
2
Au
 
3
Sb
 
10
S
 
10
Essential elements:Ag, Au, S, Sb, Tl
All elements listed in formula:Ag, Au, S, Sb, Tl

Relationship of Criddleite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
2.LA.10Dervillite
Ag
 
2
AsS
 
2
2.LA.15Daomanite
CuPtAsS
 
2
2.LA.20Vaughanite
TlHgSb
 
4
S
 
7
2.LA.30Fettelite
Ag
 
24
HgAs
 
5
S
 
20
2.LA.35Chaméanite
(Cu,Fe)
 
4
As(Se,S)
 
4
2.LA.40Arcubisite
Ag
 
6
CuBiS
 
4
2.LA.45Mgriite
Cu
 
3
AsSe
 
3
2.LA.50Benleonardite
Ag
 
8
(Sb,As)Te
 
2
S
 
3
2.LA.55Tsnigriite
Ag
 
9
SbTe
 
3
(S,Se)
 
3
2.LA.60Borovskite
Pd
 
3
SbTe
 
4
2.LA.65Jonassonite
AuBi
 
5
S
 
4
Related Minerals - Hey's Index Grouping:

- +
5.5.1Lorándite
TlAsS
 
2
5.5.2Ellisite
Tl
 
3
AsS
 
3
5.5.3Imhofite
Tl
 
6
CuAs
 
16
S
 
40
5.5.4Simonite
TlHgAs
 
3
S
 
6
5.5.6Christite
TlHgAsS
 
3
5.5.6Routhierite
Tl(Cu,Ag)(Hg,Zn)
 
2
(As,Sb)
 
2
S
 
6
5.5.7Hutchinsonite
(Tl,Pb)
 
2
As
 
5
S
 
9
5.5.8Wallisite
(Cu,Ag)TlPbAs
 
2
S
 
5
5.5.9Bernardite
Tl(As,Sb)
 
5
S
 
8
5.5.10Vrbaite
Tl
 
4
Hg
 
3
Sb
 
2
As
 
8
S
 
20
5.5.11Rebulite
Tl
 
5
Sb
 
5
As
 
8
S
 
22
5.5.12Gillulyite
Tl
 
2
(As,Sb)
 
8
S
 
13
5.5.13Weissbergite
TlSbS
 
2
5.5.14Rohaite
(Tl,Pb,K)
 
2
Cu
 
8.7
Sb
 
2
S
 
4
5.5.15Vaughanite
TlHgSb
 
4
S
 
7
5.5.16Chalcothallite
Tl
 
2
(Cu,Fe)
 
6
SbS
 
4
5.5.17Pierrotite
Tl
 
2
Sb
 
6
As
 
4
S
 
16
5.5.18Parapierrotite
Tl(Sb,As)
 
5
S
 
8
5.5.20Chabournéite
Tl
 
21-x
Pb
 
2x
(Sb,As)
 
91-x
S
 
147
 (x = 0-17.5)

Other Names for Criddleite

Synonyms:
IMA1987-037
Other Languages:
German:Criddleit
Spanish:Criddleita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Criddleite

Reference List:American Mineralogist: 75: 706.

Internet Links for Criddleite

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  • Raman and XRD data at RRUFF project
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  • Criddleite details from Handbook of Mineralogy (PDF)
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    Localities for Criddleite

    Hide Locality List
    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Canada
     
    • Ontario
      • Thunder Bay District
        • Marathon
          • Hemlo gold deposit
    		Mineralogical Magazine 1988 52 : 691-697
    Mineralogical Magazine 1988 52 : 691-697
    Mineralogical Magazine 1988 52 : 691-697
    France
     
    • Limousin
      • Creuse
    		ontariominerals.com
    Mineral and/or Locality
    Google
     
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