https://weloveminerals.com/
https://www.mineral-bosse.de
https://www.mineralbox.biz
https://www.mineraliengrosshandel.com
https://www.edelsteine-neuburg.de
'._('einklappen').'
 

Laforêtite

Collectors Summary

Color braun
Streak color graulich schwarz
Lustre Metallglanz
Hardness (Mohs) 4
Cleavages keine an synthetischem Material
Solubility die Oberfläche zeigt Photosensitivität durch die Einwirkung von UV-Licht
Crystal System tetragonal, I42d

Chemism

Chemical formula

AgInS2

Chemical composition

Indium, Silber, Schwefel

Unit weight: 286.81752 u; Number of atoms in the formula: 4

Info

Empirical formula:

AgInS2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Sulfur

S

22.36

2

50.00

32.0655000

64.1310000
Silver

Ag

37.61

1

25.00

107.8682200

107.8682200
Indium

In

40.03

1

25.00

114.8183000

114.8183000

Analysis wt%

Ø Ag : 37.68, In : 40.22, S : 22.42 (Ref: European Journal of Mineralogy 99)

Strunz 9th edition incl. updates

2.CB.10

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfoarsenide, Sulfoantimonide, Sulfobismuthide)
C: Metallsulfide, M : S = 1 : 1 (und ähnliche)
B: mit Zink (Zn), Eisen (Fe), Kupfer (Cu), Silber (Ag), usw.
10:Chalkopyrit-Gruppe

Lapis Classification

II/C.03-050

II: SULFIDE UND SULFOSALZE (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide)
C: Sulfide mit Metall : S,Se,Te ~ 1:1
3: Chalkopyrit-Gruppe

Classification by Hölzel

2.CB.260

2: SULFIDES
C: Sulfides (etc) with Me/S=1/1
B: With Zn,Cu (etc), Coordination Number ~[4] Framework of Cornersharing Tetrahedra: Sphalerite-Germanite-Family
2: Chalcopyrite-Group

Dana 8th edition

02.09.01.06

02: Sulfide Minerals
09: Sulfides - Including Selenides and Tellurides where Am Bn Xp, with (m+n):p=1:1
01: Chalcopyrite Group (Tetragonal: I-42d)

IMA status

anerkannt 1995

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Chalcopyrite group

Optical Properties

Color

braun

Streak color

graulich schwarz

Change in color

bräunlich grau in reflektiertem Licht

Diaphaneity (Transparency)

opak

Lustre

Metallglanz

Pleochroism

schwach

Anisotropism

stark

Reflectivity: (Lambda nm) ↓, ↑, Ø

(400) 30.00, , 30.00
(420) 29.00, , 29.00
(440) 28.00, , 28.00
(460) 27.00, , 27.00
(480) 26.00, , 26.00
(500) 25.20, , 25.20
(520) 24.80, , 24.80
(540) 24.60, , 24.60
(560) 24.30, , 24.30
(580) 24.20, , 24.20
(600) 24.30, , 24.30
(620) 24.30, , 24.30
(640) 24.60, , 24.60
(660) 25.80, , 25.80
(680) 25.20, , 25.20
(700) 24.70, , 24.70
Reflection chart Laforêtite

Reflectivity Ø

25.75

Crystallography

Crystal System

tetragonal

Class (H-M)

42m

Space Group number

122

Space Group

I42d

Cell parameters a (Å)

5.880

Cell parameters b (Å)

-

Cell parameters c (Å)

11.21

Cell parameters a/b or c/a

1.906

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volume (ų)

387.579

X-Ray Powder Diffraction

3.351(100), 2.942(80), 2.082(75), 2.035(75), 1.768(80), 1.707(35)
XRD chart Laforêtite

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

Physical Properties

Hardness (Mohs)

4

VHN (Hardness Vickers)

183 (100g)

Density (g/cm³)

4.93 (berechnet)

4.915 ( ρ calc. Mineralienatlas )

Cleavages

keine an synthetischem Material

Instability

die Oberfläche zeigt Photosensitivität durch die Einwirkung von UV-Licht

(Co-)Type locality

(Co-)Type locality

Frankreich/Auvergne-Rhône-Alpes, Region/Haute-Loire, Département/Brioude, Arrondissement/La Besseyre-Saint-Mary/La Boriette/Montgros Mine

Preface

Author (Name, Year)

Meisser & Thelin & Chiappero & Maurel, 1999

References

Strunz Mineralogical Tables 9. Edition

Meisser, N., Thelin, P., Chiappero, P.J., and Maurel, C. (1999) Laforêtite, AgInS2, a new mineral of the chalcopyrite group from the Montgros mine, Haute-Loire, France. European Journal of Mineralogy (1999): 11: 891-897.

Mineralogical Record: 31: 368.

IMA group assignments

Other languages

German

Laforêtit

Spanish

Laforêtita

English

Laforêtite

French

Laforêtite

Russian

Лафоретит

Alternative Name

Gallita

CNMNC (IMA)-Number

IMA 1995-006

CNMNC symbol

Symbol

Laf

Locations with GPS information

IDs

GUSID (Global unique identifier short form) VRaQDtoCKECWAd25kYrZag
GUID (Global unique identifier) 0E901655-02DA-4028-9601-DDB9918AD96A
Database ID 2115