Mindat Logo

Chalcocite

This page kindly sponsored by Robert Manson North



Formula:
Cu
 
2
S
System:MonoclinicColour:Blue black, gray, black, ...
Lustre:MetallicHardness:2½ - 3
Name:Named chalcosine in 1832 by Fracois Sulpice Beudant from Greek, "chalkos", copper. This mineral was known by a wide variety of names previously. In 1868, James D. Dana and George J. Brush re-named this material "chalcocite"


Chalcocite-Digenite Group. Chalcocite-Yarrowite Series.

A secondary mineral in or near the oxidized zone of copper sulfide deposits. Hexagonal above 105 °C ('High-chalcocite').
Easily confused with djurleite.

Classification of Chalcocite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:2/B.01-10
Nickel-Strunz 10th (pending) edition ID:2.BA.05

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
A : With Cu, Ag, Au
Dana 8th edition ID:2.4.7.1

2 : SULFIDES
4 : AmBnXp, with (m+n):p = 2:1
Hey's CIM Ref.:3.1.1

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
1 : Sulphides etc. of Cu
mindat.org URL:http://www.mindat.org/min-962.html
Please feel free to link to this page.

Physical Properties of Chalcocite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:Blue black, gray, black, black gray, or steel gray
Streak:Blackish lead gray
Hardness (Mohs):2½ - 3
Hardness (Vickers):VHN100=84 - 87 kg/mm2
Tenacity:Brittle
Cleavage:Poor/Indistinct
Indistinct on (110)
Fracture:Conchoidal
Comment:Somewhat sectile
Density (measured):5.5 - 5.8 g/cm3
Density (calculated):5.8 g/cm3

Crystallography of Chalcocite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b
Space Group Setting:P21/c
Cell Parameters:a = 15.246(4) Å, b = 11.884(2) Å, c = 13.494(3) Å
β = 116.35(1)°
Ratio:a:b:c = 1.283 : 1 : 1.135
Unit Cell Volume:V 2,190.86 ų (Calculated from Unit Cell)
Twinning:Common on {110} yielding pseudohexagonal stellate forms. Also on {032}, {112}.
Comment:May be point group m and space group Pc; other monoclinic cell given: a = 11.82, b = 27.05, c = 13.43, β = 90°.
Crystal Atlas:
Image Loading
Click on an icon to view
Chalcocite no.48 - Goldschmidt (1913-1926)
Chalcocite - Penetration twin on {032}
Chalcocite - Multiple twin on {110}

About Crystal Atlas

The mindat.org Crystal Atlas allows you to view a selection of crystal drawings of real and idealised crystal forms for this mineral and, in certain cases, 3d rotating crystal objects. The 3d models and HTML5 code are kindly provided by www.smorf.nl.

Toggle
Edge Lines | Miller Indicies | Axes

Transparency
Opaque | Translucent | Transparent

View
Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data:
Data courtesy of RRUFF project at University of Arizona, used with permission.
X-Ray Powder Diffraction:
d-spacingIntensity
3.276 (35)
2.7256 (35)
2.4074 (50)
2.4030 (70)
1.9746 (70)
1.8811 (70)
1.8800 (100)
Comments:Similar to djurleite.

Optical Data of Chalcocite

Type:Anisotropic
Anisotropism:Weak

Chemical Properties of Chalcocite

Formula:
Cu
 
2
S
Simplified for copy/paste:Cu2S
Essential elements:Cu, S
All elements listed in formula:Cu, S
Common Impurities:Fe

Relationship of Chalcocite to other Species

Series:Forms a series with Yarrowite (see here)
Structurally related to group(s):
Chalcocite-Digenite Group
Related Minerals - Nickel-Strunz Grouping):

- +
2.BA.05Djurleite
Cu
 
31
S
 
16
2.BA.05Geerite
Cu
 
8
S
 
5
2.BA.05Roxbyite
Cu
 
9
S
 
5
2.BA.10Anilite
Cu
 
7
S
 
4
2.BA.10Digenite
Cu
 
9
S
 
5
2.BA.15Bornite
Cu
 
5
FeS
 
4
2.BA.20Bellidoite
Cu
 
2
Se
2.BA.20Berzelianite
Cu
 
2
Se
2.BA.25Athabascaite
Cu
 
5
Se
 
4
2.BA.25Umangite
Cu
 
3
Se
 
2
2.BA.30Rickardite
Cu
 
7
Te
 
5
2.BA.30Weissite
Cu
 
2-x
Te
2.BA.35Acanthite
Ag
 
2
S
2.BA.40Mckinstryite
Ag
 
5-x
Cu
 
3+x
S
 
4
2.BA.40Stromeyerite
AgCuS
2.BA.40dUM2003-13-S:AgAuCu
Ag
 
6
AuCu
 
2
S
 
5
2.BA.45Jalpaite
Ag
 
3
CuS
 
2
2.BA.45Selenojalpaite
Ag
 
3
CuSe
 
2
2.BA.50Eucairite
AgCuSe
2.BA.55Aguilarite
Ag
 
4
SeS
2.BA.55Naumannite
Ag
 
2
Se
2.BA.60Cervelleite
Ag
 
4
TeS
2.BA.60Hessite
Ag
 
2
Te
2.BA.60Chenguodaite
Ag
 
9
Fe
3+
 
Te
 
2
S
 
4
2.BA.65Henryite
(Cu,Ag)
 
3+x
Te
 
2
, with x ~ 0.40
2.BA.65Stützite
Ag
 
5-x
Te
 
3
, x = 0.24-0.36
2.BA.70Argyrodite
Ag
 
8
GeS
 
6
2.BA.70Canfieldite
Ag
 
8
SnS
 
6
2.BA.70Putzite
(Cu
 
4.7
Ag
 
3.3
)GeS
 
6
2.BA.75Fischesserite
Ag
 
3
AuSe
 
2
2.BA.75Penzhinite
(Ag,Cu)
 
4
Au(S,Se)
 
4
2.BA.75Petrovskaite
AuAg(S,Se)
2.BA.75Petzite
Ag
 
3
AuTe
 
2
2.BA.75Uytenbogaardtite
Ag
 
3
AuS
 
2
2.BA.80Bezsmertnovite
(Au,Ag)
 
4
Cu(Te,Pb)
2.BA.80Bilibinskite
PbCu
 
2
Au
 
3
Te
 
2
2.BA.80Bogdanovite
(Au,Te,Pb)
 
3
(Cu,Fe)
Related Minerals - Hey's Index Grouping:

- +
3.1.2Djurleite
Cu
 
31
S
 
16
3.1.3Digenite
Cu
 
9
S
 
5
3.1.4Anilite
Cu
 
7
S
 
4
3.1.5Roxbyite
Cu
 
9
S
 
5
3.1.6Spionkopite
Cu
 
39
S
 
28
3.1.7Geerite
Cu
 
8
S
 
5
3.1.8Covellite
CuS
3.1.9Berzelianite
Cu
 
2
Se
3.1.10Bellidoite
Cu
 
2
Se
3.1.11Umangite
Cu
 
3
Se
 
2
3.1.12Yarrowite
Cu
 
9
S
 
8
3.1.13Athabascaite
Cu
 
5
Se
 
4
3.1.14Klockmannite
CuSe
3.1.15Krut'aite
CuSe
 
2
3.1.16Weissite
Cu
 
2-x
Te
3.1.17Rickardite
Cu
 
7
Te
 
5
3.1.18Vulcanite
CuTe
3.1.19Bambollaite
Cu(Se,Te)
 
2
3.1.20Lautite
CuAsS
3.1.21Mgriite
Cu
 
3
AsSe
 
3
3.1.22Cubanite
CuFe
 
2
S
 
3
3.1.23Bornite
Cu
 
5
FeS
 
4
3.1.24Fukuchilite
Cu
 
3
FeS
 
8
3.1.25Chalcopyrite
CuFeS
 
2
3.1.26Mooihoekite
Cu
 
9
Fe
 
9
S
 
16
3.1.27Haycockite
Cu
 
4
Fe
 
5
S
 
8
3.1.28Isocubanite
CuFe
 
2
S
 
3
3.1.29Idaite
Cu
 
5
FeS
 
6
3.1.30Nukundamite
Cu
 
3.4
Fe
 
0.6
S
 
4
3.1.31Putoranite
Cu
 
9
(Fe,Ni)
 
9
S
 
16
3.1.32Orickite
2CuFeS
 
2
· H
 
2
O
3.1.33Eskebornite
CuFeSe
 
2
3.1.34Chaméanite
(Cu,Fe)
 
4
As(Se,S)
 
4
3.1.35Talnakhite
Cu
 
9
(Fe,Ni)
 
8
S
 
16

Other Names for Chalcocite

Synonyms:
ChalcocineChalcosineChalcositeCopper GlanceCuprein
CupreineCypriteKupreinRedruthiteVitreous Copper
Other Languages:
Basque:Kalkozita
Catalan:Calcosina
Dutch:Chalcociet
Finnish:Kuparihohde
French:Chalcocite
Cuivre Spiciforme
Cuivre Sulfuré Spiciforme
Cuivre Vitreux
German:Chalkosin
Chalcocit
Chalcosin
Chalcosit
Cyprit
Kupferglanz
Kupferglanz-β
Kupferglasertz
Kupferglaserz
Lecherz
Redruthit
Hungarian:Kalkozin
Italian:Calcocite
Rame grigio
Japanese:輝銅鉱
Latin:Aes cyprium apud plinium appellatur cuprum
Aes rude plumbei coloris
Lithuanian:Chalkocitas
Low Saxon:Chalkosin
Norwegian (Bokmål):Kobberglans
Polish:Chalkozyn
Portuguese:Calcocita
Russian:Халькозин
Simplified Chinese:辉铜矿
Spanish:Calcosina
Calcosita
Chalcocita
Chalcosita
Cyprita
Redruthita
Swedish:Kopparglans
Koppar-Glas (of Wallerius)
Traditional Chinese:輝銅礦
Varieties:
Argentiferous ChalcociteDucktowniteHarrisitePara-Kupferglanz

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Chalcocite

Reference List:

- +
Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged, 834pp.: 187-190.

Zeitschrift für Kristallographie 150, 299-320.

Cook, W.R. (1972): Instability of chalcocite. Mineralogical Record 3, 15.

Pósfai, M. & Buseck, P. R. (1994): Djurleite, digenite, and chalcocite: Intergrowths and transformations. American Mineralogist, 79, 308-315.

Internet Links for Chalcocite

Search Engines:
  • Look for Chalcocite on Google
  • Look for Chalcocite images on Google
  • External Links:
  • Look for Chalcocite on Webmineral
  • Look for Chalcocite on Athena Mineralogy
  • Look for Chalcocite on Wikipedia
  • Look for Chalcocite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Chalcocite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
  • Fine minerals from bisbeeborn.com
  • Fabre Minerals - search for Chalcocite specimens
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Find Chalcocite on www.crystalclassics.co.uk
  • Buy from McDougall Minerals
  • Lapis Mineral Magazin
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • Rare and Unusual minerals at Mineralogical Research Company
  • Top quality minerals from Kristalle of California
  • Fine Minerals from Weinrich Minerals, Inc.
  • Search for Chalcocite on Well-Arranged Molecules
  • Buy fine minerals and gemstones from Pala International
  • Specimens:The following Chalcocite specimens are currently listed for sale on minfind.com.

    Localities for Chalcocite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Mineral and/or Locality  
    Search Google  
    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
    Current server date and time: December 9, 2014 00:41:07
    Mineral and Locality Search
    Mineral:
    and/or Locality:
    Options
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds