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Benleonardite

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Benleonardite
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1435631688
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Benleonardite
Gray-black benleonardite with tlalocite on quartz. FOV 4mm. Specimen has been analyzed; Bambollita Mine, Moctezuma, Mun. de Moctezuma, Sonora, Mexico
Copyright: Brent Thorne; Contribution: Stefan
Collection: Brent Thorne
Location: Mexiko/Sonora/Moctezuma, Municipio/Moctezuma/Bambollita Mine
Mineral: Benleonardite
Image: 1435631688
License: Usage for Mineralienatlas project only
Benleonardite

Gray-black benleonardite with tlalocite on quartz. FOV 4mm. Specimen has been analyzed; Bambollita Mine, Moctezuma, Mun. de Moctezuma, Sonora, Mexico

Collection: Brent Thorne
Copyright: Brent Thorne
Contribution: Stefan 2015-06-30
Locality: Bambollita Mine / Moctezuma / Moctezuma, Municipio / Sonora / Mexiko

Collectors Summary

Color sehr blassblau
Hardness (Mohs) 3.5
Crystal System tetragonal,

Chemism

Chemical formula

Ag15Cu(Sb,As)2S7Te4

Empirical formula (analysis)

Ag15.00Cu1.00Sb1.58As0.42S7.03Te3.97

Additional chem. information

Glied der Pearceit-Polybasit-Gruppe

Chemical composition

Antimon, Arsen, Kupfer, Silber, Tellur, Schwefel

Unit weight: 2637.42200584 u; Number of atoms in the formula: 29

Info

Empirical formula:

Ag15.00Cu1.00Sb1.58As0.42S7.03Te3.97

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Sulfur

S

8.55

7.03

24.24

32.0655000

225.4204650

Copper

Cu

2.41

1

3.45

63.5463000

63.5463000

Arsenic

As

1.19

0.42

1.45

74.9216020

31.4670728

Silver

Ag

61.35

15

51.72

107.8682200

1,618.0233000

Antimony

Sb

7.29

1.58

5.45

121.7601000

192.3809580

Tellurium

Te

19.21

3.97

13.69

127.6030000

506.5839100

Analysis wt%

Ø Ag : 64.50, Sb : 7.30, As : 1.40, Te : 18.70, S : 8.00 (Ref: Mineralogical Magazine 86)

Strunz 9th edition incl. updates

2.LA.50

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfoarsenide, Sulfoantimonide, Sulfobismuthide)
L: unklassifizierte Sulfosalze
A: ohne nennenswertes Pb (Blei)
50:Benleonardit-Gruppe

Lapis Classification

II/E.05-060

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

Classification by Hölzel

2.GA.380

2: SULFIDES
G: SnS Archetype
A: With Cu,Ag,Fe (without Pb)
3: Pearceite-Polybasite-Group

Dana 8th edition

03.01.10.01

03: Sulfides - Sulfosalts
01: Sulfides - Sulfosalts where z/y > 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Pearceite-Polybasite group

Optical Properties

Color

sehr blassblau

Diaphaneity (Transparency)

opak

Crystallography

Crystal System

tetragonal

Cell parameters a (Å)

6.603

Cell parameters b (Å)

-

Cell parameters c (Å)

12.726

Cell parameters a/b or c/a

1.927

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

1

Volume (ų)

554.849

X-Ray Powder Diffraction

12.7(70),
3.188(30),
2.936(100),
2.863(20),
2.608(30),
2.328(20),
2.158(30),
2.120(20)

XRD chart Benleonardite

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

Physical Properties

Hardness (Mohs)

3.5

VHN (Hardness Vickers)

117 (25g)

Density (g/cm³)

7.76 (berechnet)

7.893 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Mexiko/Sonora/Moctezuma, Municipio/Moctezuma/Bambollita Mine

Collection number of type material

E.1161 BM 1985, 354

Preface

Author (Name, Year)

Stanley & Criddle & Chisholm, 1986

References

Mineralogical Magazine 50 (1986), 681

A paper on the mineral benleonardite has been published recently [L. Bindi, C.J. Stanley, P.G. Spry: New structural data reveal benleonardite to be a member of the pearceite-polybasite group. Mineralogical Magazine, 79, 1213–1221 (2015)] in which the ideal chemical formula of the mineral is given as Ag15Cu(Sb,As)2S7Te4. In this formula, based on new EPMA and SCXRD data, Cu is present as an essential component, whereas it was lacking in the previously accepted formula of benleonardite. These data were examined carefully by the CNMNC officers and were considered reliable. Accordingly it was agreed to modify the formula of benleonardite in the official IMA List of Minerals. - CNMNC Newsletter No. 28, December 2015, page 1864; Mineralogical Magazine, 79, 1859–1864.

IMA group assignments

Other languages

German

Benleonardit

Spanish

Benleonardita

English

Benleonardite

French

Benleonardite

Russian

Бенлеонардит

Japanese

ベンレオナルド鉱

CNMNC (IMA)-Number

IMA 1985-043

CNMNC symbol

Symbol

Bln

Locations with GPS information

IDs

GUSID (Global unique identifier short form) Zl_UD3SGeU2LiVYPBFMp8g
GUID (Global unique identifier) 0FD45F66-8674-4D79-8B89-560F045329F2
Database ID 355