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Dalnegroite

Collectors Summary

Color dunkelgrau
Streak color braunrot
Lustre Halbmetallglanz
Hardness (Mohs) 3 - 3.5
Cleavages keine
Fracture uneben
Crystal System triklin, P1

Chemism

Chemical formula

Tl4Pb2(As,Sb)20S34

Additional chem. information

As-dominantes Analog von Chabournéit

Chemical composition

Antimon, Arsen, Blei, Thallium, Schwefel

Unit weight: 4054.80481 u; Number of atoms in the formula: 60

Info

Empirical formula:

Tl4Pb2(As0.75Sb0.25)20S34

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Sulfur

S

26.89

34

56.67

32.0655000

1,090.2270000

Arsenic

As

27.72

15

25.00

74.9216020

1,123.8240300

Antimony

Sb

15.01

5

8.33

121.7601000

608.8005000

Thallium

Tl

20.16

4

6.67

204.3833200

817.5332800

Lead

Pb

10.22

2

3.33

207.2100000

414.4200000

Analysis wt%

S : 25.99, As : 21.21, Sb : 23.63, Pb : 8.80, Tl : 20.76 (Ref: Mineralogical Magazine 2009)

Strunz 9th edition incl. updates

2.HC.05e

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfarsenite, Sulfantimonite, Sulfbismuthite)
H: Sulfosalze mit SnS als Vorbild
C: Nur mit [Blei] (Pb)
05e:

Lapis Classification

II/E.14-045

II: SULFIDE UND SULFOSALZE (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide)
E: Sulfosalze (S : As,Sb,Bi = x)
14: Sulfosalze mit Thallium/Quecksilber vorherrschend (x=4,0 - 1,6)

Classification by Hölzel

2.GD.570

2: SULFIDES
G: SnS Archetype
5: SnS + PbS Archetype

IMA status

anerkannt, Neue Mineralien - IMA Web-Seite, Okt. 2009

Mineral status

anerkanntes Mineral

Optical Properties

Color

dunkelgrau

Streak color

braunrot

Change in color

Dalnegroit ist im widerspiegelten Licht stark doppelt refletierend und schwach pleochroitisch, von weiß bis ein wenig ins grünlich-graue. Im kreuz-polarisiertem Licht ist es hoch anisotropisch mit bläulich zu grünen kreisförmigen Schattier

Diaphaneity (Transparency)

opak

Lustre

Halbmetallglanz

Pleochroism

weiß bis ein wenig ins grünlich-graue

Bireflectance

stark

Reflectivity: (Lambda nm) ↓, ↑, Ø

(471.1) 45.60, 46.10, 45.85
(548.3) 46.10, 46.60, 46.35
(586.6) 46.10, 46.60, 46.35
(652) 46.40, 47.10, 46.75

Reflection chart Dalnegroite

Reflectivity Ø

46.33

Crystallography

Crystal System

triklin

Class (H-M)

1

Space Group number

1

Space Group

P1

Cell parameters a (Å)

16.217

Cell parameters b (Å)

42.544

Cell parameters c (Å)

8.557

Cell parameters a/b or c/a

0.381

Cell parameters c/b

0.201

Cell parameters α

95.72

Cell parameters β

90.25

Cell parameters γ

96.62

Z

4

Volumne (ų)

5834.469

Kristall structure

durch Analogie mit Chabournéit

X-Ray Powder Diffraction

3.927(100), 3.775(45), 3.685(45), 3.620(50), 3.124(50), 2.929(60), 2.850(70), 2.097(60)

XRD chart Dalnegroite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

3 - 3.5

VHN (Hardness Vickers)

87 (25g)

Density (g/cm³)

4.82 (berechnet)

4.616 ( ρ calc. Mineralienatlas )

Cleavages

keine

Fracture

uneben

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Schweiz/Wallis/Goms, Bezirk/Binn/Fäld (Imfeld, Im Feld)/Grube Lengenbach

Type material

Museum of Mineralogy, Department of Geosciences, Universität von Padova, Italien

Collection number of type material

MMP M7620

Preface

Name from

Alberto Dal Negro, Professor der Mineralogie und Kristallographie an der Universität von Padova seit 1976.

Author (Name, Year)

Fabrizio Nestola, 2009

References

Neue Mineralien - IMA Web-Seite, Okt. 2009

Nestola, F., Guastoni, A., Bindi, L., Secco, L. (2009): Dalnegroite, Tl5-xPb2x(As,Sb)21-xS34, a new thallium sulphosalt from Lengenbach quarry, Binntal, Switzerland. Mineralogical Magazine, 73, S.1027-1032.
Erratum dazu in Mineralogical Magazine 74 (2010) S.187.

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Dalnegroite

Tl4Pb2(As,Sb)20S34

triklin : 1 : P1

2.HC.05e

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Rebulite

Tl5Sb5As8S22

monoklin : 2/m : P21/c

II/E.14-010

Jankovićite

Tl5Sb9(As,Sb)4S22

triklin : 1 : P1

II/E.14-012

Philrothite

TlAs3S5

monoklin : 2/m : P21/c

II/E.14-014

Imhofite

Tl5.8As15.4S26

monoklin : 2/m : P21/n

II/E.14-015

Bernardite

Tl(As,Sb)5S8

monoklin : 2/m : P21/c

II/E.14-020

Gillulyite

Tl2(As,Sb)8S13

monoklin : 2/m : P2/n

II/E.14-025

Pierrotite

Tl2Sb6As4S16

orthorhombisch : mm2 : Pna21

II/E.14-030

Parapierrotite

Tl(Sb,As)5S8

monoklin : m : Pn

II/E.14-040

Dalnegroite

Tl4Pb2(As,Sb)20S34

triklin : 1 : P1

II/E.14-045

Chabournéite

(Tl,Pb)21(Sb,As)91S147

triklin : 1 : P1

II/E.14-050

Protochabournéite

Tl2-xPb1+2x(Sb10-x-yAsy)S17 (x = 0.10-0.24, y = 1-2)

triklin : 1 : P1

II/E.14-052

Boscardinite

TlPb4(Sb7As2)Σ9S18

triklin : 1 : P1

II/E.14-055

Gabrielite

Tl2AgCu2As3S7

triklin : 1 : P1

II/E.14-060

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Nuffieldite

Pb2Cu(Pb,Bi)Bi2S7

orthorhombisch : mmm : Pbnm

2.GD.500

Zinkenite

Pb9Sb22S42

hexagonal : 6 : P63

2.GD.530

Protochabournéite

Tl2-xPb1+2x(Sb10-x-yAsy)S17 (x = 0.10-0.24, y = 1-2)

triklin : 1 : P1

2.GD.550

Chabournéite

(Tl,Pb)21(Sb,As)91S147

triklin : 1 : P1

2.GD.560

Dalnegroite

Tl4Pb2(As,Sb)20S34

triklin : 1 : P1

2.GD.570

Other languages

German

Dalnegroit

Spanish

Dalnegroita

English

Dalnegroite

Russian

Дальнегроит

IMA Number

IMA 2009-058

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Dalnegroit
Google-Bilder-Suche - search for: Dalnegroit
Mineralogisch-Petrographisches-Institut Hamburg - search for: Dalnegroit

English pages

Mindat - search for: Dalnegroite
Webmineral - search for:Dalnegroite
Handbook-of-Mineralogy - search for: Dalnegroite
RRUFF - Raman, XRD and other mineral data - search for: Dalnegroite
RRUFF - References and PDF downloads - search for: Dalnegroite
American-Mineralogist-Crystal-Structure-Database - search for: Dalnegroite
Athena - search for: Dalnegroite

Russian pages

Webmineral.ru - search for: Дальнегроит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Dalnegroit
Crystal-Treasure.com - search for: Dalnegroit
Bosse - search for: Dalnegroit

Locations with GPS information




Notice: "Undefined variable: ub"