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Calumetite

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Formula:
Cu(OH,Cl)
 
2
· 2H
 
2
O
System:OrthorhombicColour:Azure blue; Powder blue
Hardness:2
Name:Named for the town of Calumet, Michigan, USA, near which it was first discovered.
This page provides mineralogical data about Calumetite.

Classification of Calumetite

IMA status:Approved
Strunz 8th edition ID:3/D.01-70
Nickel-Strunz 10th (pending) edition ID:3.DA.40

3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
A : With Cu, etc., without Pb
Dana 8th edition ID:6.2.5.1

6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
2 : X(OH)2
Hey's CIM Ref.:8.2.8

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
2 : Halides of Cu
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Type Occurrence of Calumetite

Type Locality:Centennial Mine, Centennial, Houghton Co., Michigan, USA
Year of Discovery:1963

Physical Properties of Calumetite

Lustre:Pearly
Comment:On basal cleavages
Colour:Azure blue; Powder blue
Comment:In masses: Brilliant azure blue inclining to powder blue
Hardness (Mohs):2

Crystallography of Calumetite

Crystal System:Orthorhombic
Morphology:Basal pinacoid {001} and first order prism {110}.
Comment:Neither point group nor space group are determined.
X-Ray Powder Diffraction:
d-spacingIntensity
7.50 (10)
3.76 (5)
3.42 (3)
3.30 (3)
3.02 (6)
2.481 (8)
2.341 (3)
(

Optical Data of Calumetite

Type:Biaxial
RI values: nα = 1.666 nβ = 1.690 nγ = 1.690
2V:Measured: 2°
Maximum Birefringence:δ = 0.024

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:r > v or r < v

Chemical Properties of Calumetite

Formula:
Cu(OH,Cl)
 
2
· 2H
 
2
O
Simplified for copy/paste:Cu(OH,Cl)2·2H2O
Essential elements:Cu, H, O
All elements listed in formula:Cl, Cu, H, O

Relationship of Calumetite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
3.DA.05Melanothallite
Cu
 
2
Cl
 
2
O
3.DA.10aAtacamite
Cu
 
2
(OH)
 
3
Cl
3.DA.10bBotallackite
Cu
 
2
(OH)
 
3
Cl
3.DA.10bClinoatacamite
Cu
 
2
(OH)
 
3
Cl
3.DA.10aHibbingite
Fe
2+
2
(OH)
 
3
Cl
3.DA.10aKempite
Mn
2+
2
(OH)
 
3
Cl
3.DA.10cParatacamite
Cu
 
3
(Cu,Zn)(OH)
 
6
Cl
 
2
3.DA.10bBelloite
Cu(OH)Cl
3.DA.10cHerbertsmithite
Cu
 
3
Zn(OH)
 
6
Cl
 
2
3.DA.10cKapellasite
Cu
 
3
Zn(OH)
 
6
Cl
 
2
3.DA.10cGillardite
Cu
 
3
Ni(OH)
 
6
Cl
 
2
3.DA.10cHaydeeite
Cu
 
3
Mg(OH)
 
6
Cl
 
2
3.DA.10dAnatacamite
Cu
 
2
Cl(OH)
 
3
3.DA.15Claringbullite
Cu
 
4
(OH)
 
7
Cl · nH
 
2
O
3.DA.15Barlowite
Cu
 
4
BrF(OH)
 
6
3.DA.20Simonkolleite
Zn
 
5
Cl
 
2
(OH)
 
8
· H
 
2
O
3.DA.25Buttgenbachite
Cu
 
19
(NO
 
3
)
 
2
(OH)
 
32
Cl
 
4
· 2H
 
2
O
3.DA.25Connellite
Cu
 
19
(SO
 
4
)(OH)
 
32
Cl
 
4
· 3H
 
2
O
3.DA.30Abhurite
Sn
 
21
Cl
 
16
(OH)
 
14
O
 
6
3.DA.35Ponomarevite
K
 
4
Cu
 
4
Cl
 
10
O
3.DA.40Anthonyite
Cu(OH,Cl)
 
2
· 3H
 
2
O
3.DA.45Khaidarkanite
Na
 
0.34
Cu
 
4
Al
 
3
(OH)
 
14
F
 
3
· 2H
 
2
O
3.DA.50Bobkingite
Cu
 
5
Cl
 
2
(OH)
 
8
· 2H
 
2
O
3.DA.55Avdoninite
K
 
2
Cu
 
5
(OH)
 
4
Cl
 
8
· H
 
2
O
3.DA.60Droninoite
Ni
 
6
Fe
2+
3
(OH)
 
16
Cl
 
2
· 4H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
8.2.1Nantokite
CuCl
8.2.2Tolbachite
CuCl
 
2
8.2.3Eriochalcite
CuCl
 
2
· 2H
 
2
O
8.2.4Atacamite
Cu
 
2
(OH)
 
3
Cl
8.2.5Paratacamite
Cu
 
3
(Cu,Zn)(OH)
 
6
Cl
 
2
8.2.6Botallackite
Cu
 
2
(OH)
 
3
Cl
8.2.7Melanothallite
Cu
 
2
Cl
 
2
O
8.2.9Anthonyite
Cu(OH,Cl)
 
2
· 3H
 
2
O
8.2.10Claringbullite
Cu
 
4
(OH)
 
7
Cl · nH
 
2
O
8.2.11Marshite
CuI
8.2.12Mitscherlichite
K
 
2
CuCl
 
4
· 2H
 
2
O
8.2.13Ponomarevite
K
 
4
Cu
 
4
Cl
 
10
O

Other Names for Calumetite

Other Languages:
German:Calumetit
Spanish:Calumetita

Other Information

Other Information:Soluble in cold, dilute acids but insoluble in ammonia and water.
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 Calumetite

Reference List:

- +
Williams, S. A. (1963): Anthonyite and calumetite, two new minerals from the Michigan copper district. American Mineralogist: 48: 614-619.

Internet Links for Calumetite

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  • Raman and XRD data at RRUFF project
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  • Calumetite details from Handbook of Mineralogy (PDF)
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  • Localities for Calumetite

    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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Austria
     
    • Tyrol
      • North Tyrol
        • Inn valley
          • Brixlegg - Schwaz area
            • Brixlegg - Rattenberg
    Schnorrer, G. & Poeverlein, R. (2008): Schwaz-Brixlegger Fundstellen. 6. Die Minerale des Gratlspitz bei Brixlegg in Tirol. Aufschluss 59, 7-28.
    Germany
     
    • Lower Saxony
      • Harz
        • Goslar
          • Astfeld
    No reference listed
    • Rhineland-Palatinate
      • Lahn valley
    Wittern: "Mineralfundorte in Deutschland", 2001
          • Frücht
    Der Aufschluss Vol.55, March/April 2004
      • Siegerland
        • Niederfischbach
    Weiss: "Mineralfundstellen, Deutschland West", 1990
    Greece
     
    • Attikí Prefecture (Attica; Attika)
      • Lavrion District (Laurion; Laurium)
    Schnorrer-Köhler, G., Standfuss, K. & Standfuss, L. (1981): Neufunde von Mineralen aus den antiken Bleischlacken Laurions. Der Aufschluss, 32, 165-169.; Gelaude, Piet, van Kalmthout, Piet and Rewitzer, Christian (1996): Laurion: The Minerals in the Ancient Slags
    Italy
     
    • Liguria
      • Genova Province
        • Genova
          • Varenna Valley
    Rivista Mineralogica Italiana, 2 (Avril/Juin), 175-188.
    USA
     
    • Michigan
      • Houghton Co.
        • Centennial
    Williams, S.A. (1963): Anthonyite and calumetite, two new minerals from the Michigan Copper District. American Mineralogist. 48, 614-619; Rocks & Min.:58:109.
    Rocks & Minerals 82:276-297
    Brent Thorne collection
      • Keweenaw Co.
        • Ahmeek
          • Ahmeek mine
    Mineralogy of Michigan (2004) Heinrich & Robinson
      • Ontonagon Co.
        • White Pine
    R&M 74:3 p160-176
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