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Dalnegroite

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Formula:
(Tl4Pb2)(As12Sb8)S34
Colour:
red
Lustre:
Sub-Metallic
Hardness:
3 - 3½
Crystal System:
Triclinic
Name:
Named for Alberto Dal Negro, Professor in Mineralogy and Crystallography, University of Padova, Italy.
As-dominant analogue of chabournéite.

Structurally related to the Sartorite Group.


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Classification of DalnegroiteHide

Approved
Approval Year:
2009
2.HC.05e

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
H : Sulfosalts of SnS archetype
C : With only Pb
3.8.12.2

3 : SULFOSALTS
8 : 1 < ø < 2

Physical Properties of DalnegroiteHide

Sub-Metallic
Transparency:
Opaque
Colour:
red
Streak:
brownish-red
Hardness:
3 - 3½ on Mohs scale
Hardness:
VHN25=87 kg/mm2 - Vickers
Tenacity:
Brittle
Fracture:
None observed

Chemical Properties of DalnegroiteHide

Formula:
(Tl4Pb2)(As12Sb8)S34
IMA Formula:
Tl4Pb2(As,Sb)20S34

Crystallography of DalnegroiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pedial
Space Group:
P1
Cell Parameters:
a = 16.217(7) Å, b = 42.544(9) Å, c = 8.557(4) Å
α = 95.72(4)°, β = 90.25(4)°, γ = 96.78(4)°
Ratio:
a:b:c = 0.381 : 1 : 0.201
Unit Cell V:
5,832.53 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.927 (100)
3.774 (45)
3.685 (45)
3.620 (50)
3.124 (50)
2.929 (60)
2.850 (70)
2.097 (60)

Type Occurrence of DalnegroiteHide

Synonyms of DalnegroiteHide

Other Language Names for DalnegroiteHide

Relationship of Dalnegroite to other SpeciesHide

Structurally related to group(s):
Sartorite GroupA group of chemically and structurally very complex sulphosalts which are impossible to identify visually.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Realgar1 photo of Dalnegroite associated with Realgar on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.HC.05bArgentobaumhaueriteAg1.5Pb22As33.5S72Tric. 1 : P1
2.HC.05bBaumhaueritePb12As16S36Tric. 1 : P1
2.HC.05eChabournéiteTl4Pb2(Sb,As)20S34Tric. 1 : P1
2.HC.05dDufrénoysitePb2As2S5Mon. 2 : P21
2.HC.05aGuettarditePbAsSbS4Mon. 2/m : P21/b
2.HC.05cLiveingitePb9As13S28Mon.
2.HC.05fParapierrotiteTlSb5S8Mon. m
2.HC.05fPierrotiteTl2(Sb,As)10S16Orth. mm2 : Pna21
2.HC.05dRathiteAg2Pb12-xTlx/2As18+x/2S40Mon. 2/m : P21/b
2.HC.05aSartoritePbAs2S4Mon. 2/m : P21/m
2.HC.05aTwinnite Pb0.8Tl0.1Sb1.3As0.8S4Mon. 2/m
2.HC.05dVeenitePb2(Sb,As)2S5Mon. 2 : P21
2.HC.05gMarumoitePb32As40S92Mon. 2 : P21
2.HC.10aFülöppitePb3Sb8S15Mon. 2/m : B2/b
2.HC.10cHeteromorphitePb7Sb8S19Mon. 2/m : B2/b
2.HC.10bPlagionitePb5Sb8S17Mon. 2/m
2.HC.10dRayitePb8(Ag,Tl)2Sb8S21Mon.
2.HC.10dSemseyitePb9Sb8S21Mon. 2/m : B2/b
2.HC.15BoulangeritePb5Sb4S11Mon. 2/m : P21/b
2.HC.15FalkmanitePb3Sb2S6Mon.
2.HC.20RobinsonitePb4Sb6S13Mon. 2/m : P21/m
2.HC.25MoëloitePb6Sb6S14(S3)Orth. 2 2 2 : P21 21 2
2.HC.30DadsonitePb23Sb25S60ClTric. 1 : P1
2.HC.35OwyheeiteAg3+xPb10-2xSb11+xS28, -0.13 < x > +0.20Mon. 2/m : P21/b
2.HC.35ZoubekiteAgPb4Sb4S10Orth.
2.HC.40ParasterryiteAg4Pb20Sb14As10S58Mon. 2/m : P21/b

Related Minerals - Dana Grouping (8th Ed.)Hide

3.8.12.1ChabournéiteTl4Pb2(Sb,As)20S34Tric. 1 : P1

Other InformationHide

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

References for DalnegroiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Nestola, F., A. Guastoni, L. Bindi, and L. Secco (2009): Dalnegroite,Tl5-xPb2x(As,Sb)21-xS34, a new thallium sulphosalt from Lengenbach quarry, Binntal, Switzerland. Mineralogical Magazine, 73, 1027-1032. [see also Erratum in Mineral. Mag. 74, p. 187: all refs. to jordanite should be replaced by sartorite]
L. Bindi, Nestola, F., A. Guastoni and L. Secco (2010): The crystal structure of dalnegroite, Tl5–xPb2x(As,Sb)21–xS34: a masterpiece of structural complexity. Mineral. Mag. 74, 999-1012.

Internet Links for DalnegroiteHide

Localities for DalnegroiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Switzerland (TL)
 
  • Wallis (Valais)
    • Binn Valley
      • Fäld (Imfeld; Im Feld; Feld)
Nestola, F., A. Guastoni, L. Bindi, and L. Secco (2010): Dalnegroite,Tl5-xPb2x(As,Sb)21-xS34, a new thallium sulphosalt from Lengenbach quarry, Binntal, Switzerland. Mineralogical Magazine, 73, 1027-1032; De Battisti, L., Guastoni, A. and Raber, T. (2011): Dalnegroit, ein neues Thallium-Sulfosalz vom Lengenbach (Binntal/CH). Lapis, 36 (5), 47-48.
Mineral and/or Locality  
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