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Rohaite

Collectors Summary

Color stahlgrau
Lustre Metallglanz
Hardness (Mohs) 2.5
Solubility +++ HNO3
Crystal System orthorhombisch,

Chemism

Chem­ical formula

TlCu5SbS2

Empir­ical formula (anal­y­sis)

Tl0.97(Cu4.79Fe0.07)Pb0.04Sb1.13S2.15

Addi­tional chem. informa­tion

Laut CNMNC: (Tl,Pb,K)2Cu8.7Sb2S4 (Z = 1 ??)

Chem­ical com­po­si­tion

Antimon, Kupfer, Thallium, Schwefel

Unit weight: 721.3658994 u; Number of atoms in the formula: 9.15

Info

Empirical formula:

Tl0.97(Cu4.79Fe0.07)Pb0.04Sb1.13S2.15

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Sulfur

S

9.56

2.15

23.50

32.0655000

68.9408250

Iron

Fe

0.54

0.07

0.77

55.8452000

3.9091640

Copper

Cu

42.20

4.79

52.35

63.5463000

304.3867770

Antimony

Sb

19.07

1.13

12.35

121.7601000

137.5889130

Thallium

Tl

27.48

0.97

10.60

204.3833200

198.2518204

Lead

Pb

1.15

0.04

0.44

207.2100000

8.2884000

Anal­y­sis wt%

Ø Tl : 27.70, Sb : 43.50, Cu : 17.80, Pb : 1.60, S : 9.60 (Ref: Bull.Gronland,78)

Strunz 9th edi­tion incl. updates

2.BD.35

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfarsenite, Sulfantimonite, Sulfbismuthite)
B: Metallsulfide, M : S > 1 : 1 (hauptsächlich 2 : 1)
D: mit Quecksilber (Hg), Thallium (Tl)
35:Rohait-Gruppe

Lapis Clas­sifica­tion

II/F.04-005

II: SULFIDE UND SULFOSALZE (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide)
F: Sulfide mit nichtmetallischem Charakter
4: Alkalisulfide

Clas­sifica­tion by Hölzel

2.BD.350

2: SULFIDES
B: Sulfides (etc) with Me/S > 1/1 (mostly 2/1)
D: With Hg,Tl,(Na,K)
3: Thalcusite-Sabatierite-Group (with Tl,K)

Dana 8th edi­tion

03.07.16.01

03: Sulfides - Sulfosalts
07: Sulfides - Sulfosalts where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

IMA sta­tus

Anerkannt von der CNMNC

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

stahlgrau

Change in color

gelblich cremfarben bis matt bläulichgrau in reflektiertem Licht

Diaphane­ity (Trans­parency)

opak

Lus­tre

Metallglanz

Pleochro­ism

ausgeprägt bis stark

Anisotropism

sehr stark, von gelblich cremfarben zu schwarz, mit dunklen rotvioletten Farben nahe der Abschwächun

Reflec­tiv­ity: (Lambda nm) ↓, ↑, Ø

(420) 31.60, 36.40, 34.00
(440) 30.70, 36.60, 33.65
(460) 30.00, 36.70, 33.35
(480) 29.20, 36.50, 32.85
(500) 28.40, 36.10, 32.25
(520) 27.90, 36.00, 31.95
(540) 27.00, 35.40, 31.20
(560) 26.60, 35.20, 30.90
(580) 26.50, 35.00, 30.75
(600) 26.30, 34.60, 30.45
(620) 26.10, 34.40, 30.25
(640) 25.60, 34.00, 29.80
(660) 25.40, 33.90, 29.65
(680) 24.80, 33.70, 29.25
(700) 24.40, 33.70, 29.05

Reflection chart Rohaite

Reflec­tiv­ity Ø

31.29

Crystallography

Crystal Sys­tem

orthorhombisch

Cell param­e­ters a (Å)

3.804

Cell param­e­ters b (Å)

3.797

Cell param­e­ters c (Å)

20.986

Cell param­e­ters a/b or c/a

1.002

Cell param­e­ters c/b

5.527

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

90°

Z

2

Volumne (ų)

303.117

X-Ray Pow­der Diffrac­tion

3.800(90),
3.078(100),
2.623(50),
2.605(50),
2.577(50),
2.393(100),
2.158(50),
1.902(90)

XRD chart Rohaite

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

Crystals 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

2.5

VHN (Hard­ness Vick­ers)

94 (25g)

Density (g/cm³)

7.78 (berechnet)

7.903 ( ρ calc. Mineralienatlas )

Tenac­ity

formbar

Insta­bil­ity

+++ HNO3

Preface

Author (Name, Year)

Karup-Møller, 1978

References

Bulletin Grønlands Geologiske Undersøgelse Denmark 126 (1978), 23

Neues Jahrbuch für Mineralogie Abhandlungen 138 (1980), 122

American Mineralogist 65 (1980), 208-209.

Other languages

German

Rohait

French

Rohaite

English

Rohaite

Spanish

Rohaíta

Simplified Chinese

硫锑铜铊矿

CNMNC (IMA)-Number

IMA 1973-043

CNMNC symbol

Symbol

Roh

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

German pages

DeWikiPedia - search for: Rohait
Google-Bilder-Suche - search for: Rohait
Mineralienatlas.de (Forum) - search for: Rohait

English pages

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

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Rohait
Crystal-Treasure.com - search for: Rohait
Bosse - search for: Rohait
Edelsteine Neuburg - Gundolf Fischer - search for: Rohait

Locations with GPS information