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Crookesite

Pictures (1 Images total)

Crookesit und Berzelianit
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1217775508
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Crookesit und Berzelianit
in Calcit. C: blaugrau, B: schwärzlich. Bukov, Hochland, Mähren, Tschechien. 2 x 5 cm.
Copyright: Doc Diether; Contribution: Doc Diether
Collection: Doc Diether
Location: Tschechien/Hochland (Kraj Vysočina)/Žd'ár nad Sázavou (Saar), Okres/Rožná (Roschna)/Bukau (Bukov)
Mineral: Crookesite
Image: 1217775508
Rating: 2 (votes: 1)
License: Usage for Mineralienatlas project only
Crookesit und Berzelianit

in Calcit. C: blaugrau, B: schwärzlich. Bukov, Hochland, Mähren, Tschechien. 2 x 5 cm.

Collection: Doc Diether
Copyright: Doc Diether
Contribution: Doc Diether 2008-08-03
Locality: Bukau (Bukov) / Rožná (Roschna) / Žd'ár nad Sázavou (Saar), Okres / Hochland (Kraj Vysočina) / Tschechien

Collectors Summary

Color bleigrau
Lustre Metallglanz
Hardness (Mohs) 2.50 - 3.00
Cleavages zwei im richtigen Winkel, mittelmäßig ausgeprägt
Solubility +++ HNO3, - HCl
Crystal System tetragonal, I4

Chemism

Chem­ical formula

Cu7(Tl,Ag)Se4

Chem­ical com­po­si­tion

Kupfer, Selen, Silber, Thallium

Unit weight: 940.930645 u; Number of atoms in the formula: 12

Info

Empirical formula:

Cu7(Tl0.75Ag0.25)Se4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Copper

Cu

47.27

7

58.33

63.5463000

444.8241000

Selenium

Se

33.57

4

33.33

78.9630000

315.8520000

Silver

Ag

2.87

0.25

2.08

107.8682200

26.9670550

Thallium

Tl

16.29

0.75

6.25

204.3833200

153.2874900

Anal­y­sis wt%

Cu : 46.89, Tl : 21.03, Se : 32.43 (Ref: C.R.Paris,87)

Strunz 9th edi­tion incl. updates

2.BD.50

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)
50:Crookesit-Gruppe

Lapis Clas­sifica­tion

II/B.03-030

II: SULFIDE UND SULFOSALZE (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide)
B: Sulfide, Selenide und Telluride mit Verhältnis Metall : S,Se,Te > 1:1
3: Selenide mit Kupfer vorherrschend

Clas­sifica­tion by Hölzel

2.BD.390

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

02.04.12.01

02: Sulfide Minerals
04: Sulfides - Including Selenides and Tellurides where Am Bn Xp, with (m+n):p=2:1

IMA sta­tus

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

bleigrau

Diaphane­ity (Trans­parency)

opak

Lus­tre

Metallglanz

Anisotropism

schwach aber ausgebrägt in brauntönen

Reflec­tiv­ity: (Lambda nm) ↓, ↑, Ø

(400) 33.60, 35.90, 34.75
(420) 33.30, 35.80, 34.55
(440) 32.70, 35.80, 34.25
(460) 32.40, 35.70, 34.05
(480) 32.50, 35.60, 34.05
(500) 32.80, 35.30, 34.05
(520) 33.10, 35.10, 34.10
(540) 33.10, 34.80, 33.95
(560) 33.00, 34.70, 33.85
(580) 32.70, 34.60, 33.65
(600) 32.60, 34.70, 33.65
(620) 32.40, 35.00, 33.70
(640) 32.20, 35.20, 33.70
(660) 31.90, 35.20, 33.55
(680) 31.60, 35.30, 33.45
(700) 31.20, 35.30, 33.25

Reflection chart Crookesite

Reflec­tiv­ity Ø

33.91

Crystallography

Crystal Sys­tem

tetragonal

Class (H-M)

4

Space Group number

82

Space Group

I4

Cell param­e­ters a (Å)

10.435

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

3.954

Cell param­e­ters a/b or c/a

0.379

Cell param­e­ters c/b

-

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

90°

Z

2

Volumne (ų)

430.548

X-Ray Pow­der Diffrac­tion

5.21(10),
3.30(100),
3.01(80),
2.59(100),
2.32(30),
2.11(50),
1.837(40),
1.783(40)

XRD chart Crookesite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

2.50 - 3.00

VHN (Hard­ness Vick­ers)

108 (100g)

Density (g/cm³)

6.90 (gemessen)

7.258 ( ρ calc. Mineralienatlas )

Cleav­ages

zwei im richtigen Winkel, mittelmäßig ausgeprägt

Tenac­ity

spröde

Insta­bil­ity

+++ HNO3, - HCl

(Co-)Type locality

(Co-)Type locality

Schweden/Östergötland, Provinz/Valdemarsvik/Skrikerum

Preface

Occurrences

Bukov, Rozna, Hochland, Mähren, Tschechien.

Name from

Sir William Crookes
Sir William Crookes
1832-1919
Copyright: Public Domain; Contribution: Collector
Image: 1374840808
License: Usage for Mineralienatlas project only

Sir William Crookes (geboren am 17. Juni 1832 in London; † 4. April 1919 ebenda) war ein britischer Physiker, Chemiker, Wissenschaftsjournalist und Parapsychologe. WikiPedia:William_Crookes

Author (Name, Year)

Nordenskiöld, 1866

References

Handbook of Mineralogy (Anthony et al.), 1 (1990), 115

Bulletin Mensuel de la Société Chimique de Paris 7 (1867), 409

Comptes Rendus de l'Académie des Sciences de Paris 304 (1987), 1121

Other languages

German

Crookesit

Spanish

Crookesita

English

Crookesite

French

Crookesite

Russian

Крукесит

Traditional Chinese

硒鉈銅銀礦

Simplified Chinese

硒铊铜银矿

Simplified Chinese

硒铊银铜矿

CNMNC symbol

Symbol

Crk

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

German pages

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

English pages

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

Russian pages

Webmineral.ru - search for: Крукесит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Crookesit
Crystal-Treasure.com - search for: Crookesit
Bosse - search for: Crookesit
Edelsteine Neuburg - Gundolf Fischer - search for: Crookesit
Geolitho marketplace, by and for collectors - search for: Crookesit

Locations with GPS information