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Dalnegroite

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Formula:
Tl4Pb2(As,Sb)20S34
System:
Triclinic
Colour:
red
Lustre:
Sub-Metallic
Hardness:
3 - 3½
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.


Classification of Dalnegroite

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 Dalnegroite

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

Chemical Properties of Dalnegroite

IMA Formula:
Tl4Pb2(As,Sb)20S34
Elements listed in formula:

Crystallography of Dalnegroite

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 Volume:
V 5,832.53 ų (Calculated from Unit Cell)
X-Ray 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 Dalnegroite

Associated Minerals at Type Locality:

Relationship of Dalnegroite to other Species

Structurally related to group(s):
Sartorite GroupA group of chemically and structurally very complex sulphosalts which are impossible to identify visually.
2.HC.05bArgentobaumhaueriteAg1.5Pb22As33.5S72
2.HC.05bBaumhaueritePb12As16S36
2.HC.05eChabournéiteTl4Pb2(Sb,As)20S34
2.HC.05dDufrénoysitePb2As2S5
2.HC.05aGuettarditePbSbAsS4
2.HC.05cLiveingitePb18.5As25S56
2.HC.05fParapierrotiteTlSb5S8
2.HC.05fPierrotiteTlSb3As2S8
2.HC.05dRathiteAg2Pb12-xTlx/2As18+x/2S40
2.HC.05aSartoritePbAs2S4
2.HC.05aTwinnitePbSb2S4
2.HC.05dVeenitePb2(Sb,As)2S5
2.HC.05gMarumoitePb8As10S23
2.HC.10aFülöppitePb3Sb8S15
2.HC.10cHeteromorphitePb7Sb8S19
2.HC.10bPlagionitePb5Sb8S17
2.HC.10dRayite(Ag,Tl)2Pb8Sb8S21
2.HC.10dSemseyitePb9Sb8S21
2.HC.15BoulangeritePb5Sb4S11
2.HC.15FalkmanitePb3Sb2S6
2.HC.20RobinsonitePb4Sb6S13
2.HC.25MoëloitePb6Sb6S17
2.HC.30DadsonitePb23Sb25S60Cl
2.HC.35OwyheeiteAg3Pb10Sb11S28
2.HC.35ZoubekiteAgPb4Sb4S10
2.HC.40ParasterryiteAg4Pb20Sb14As10S58

Other Names for Dalnegroite

Name in Other Languages:

Other Information

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 Dalnegroite

Reference List:
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 Dalnegroite

mindat.org URL:
https://www.mindat.org/min-39758.html
Please feel free to link to this page.

Localities for Dalnegroite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
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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