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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, Sulfarsenite, Sulfantimonite, Sulfbismuthite)
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

Volumne (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

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


 
 
CuFeS2
tetragonal
I42d

 
 
CuFeSe2
tetragonal
P42c

 
 
CuGaS2
tetragonal
I42d

 
 
AgInS2
tetragonal
I42d

 
 
AgFeS2
tetragonal
I42d

 
 
CuInS2
tetragonal
I42d

 
 
NiFeS2
tetragonal
I42d

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Actuality: 19. May 2022 - 11:02:45

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

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