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Caminite

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Formula:
Mg
 
7
(SO
 
4
)
 
5
(OH)
 
4
· H
 
2
O
System:TetragonalColour:Colourless, white
Hardness:
Name:The name is from the Latin caminus, for chimney, since the mineral occurs in undersea black-smoker chimneys.


Not to be confused with carminite.

Classification of Caminite

IMA status:Approved
Strunz 8th edition ID:6/D.02-10
Nickel-Strunz 10th (pending) edition ID:7.BB.05

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
B : With medium-sized cations
Dana 8th edition ID:31.10.9.1

31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
10 : Miscellaneous
Hey's CIM Ref.:25.3.7

25 : Sulphates
3 : Sulphates of Mg
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Type Occurrence of Caminite

Type Locality:TAG mound (EPR 21° N), Juan de Fuca Ridge complex, East Pacific Rise, Pacific Ocean
Year of Discovery:1983

Physical Properties of Caminite

Colour:Colourless, white
Hardness (Mohs):

Crystallography of Caminite

Crystal System:Tetragonal
Cell Parameters:a = 5.23Å, c = 12.98Å
Ratio:a:c = 1 : 2.482
Unit Cell Volume:V 355.04 ų (Calculated from Unit Cell)

Optical Data of Caminite

Type:Uniaxial (-)
RI values: nω = 1.534 nε = 1.532
Maximum Birefringence:δ = 0.002

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low

Chemical Properties of Caminite

Formula:
Mg
 
7
(SO
 
4
)
 
5
(OH)
 
4
· H
 
2
O
Simplified for copy/paste:Mg7(SO4)5(OH)4·H2O
Essential elements:H, Mg, O, S
All elements listed in formula:H, Mg, O, S

Relationship of Caminite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.BB.10Hauckite
Fe
3+
3
(Mg,Mn
2+
 
)
 
24
Zn
 
18
(SO
 
4
)
 
4
(CO
 
3
)
 
2
(OH)
 
81
7.BB.15Antlerite
Cu
 
3
(SO
 
4
)(OH)
 
4
7.BB.20Dolerophanite
Cu
 
2
(SO
 
4
)O
7.BB.25Brochantite
Cu
 
4
(SO
 
4
)(OH)
 
6
7.BB.30Vergasovaite
Cu
 
3
(SO
 
4
)(MoO
 
4
,SO
 
4
)O
7.BB.35Klebelsbergite
(SbO)
 
4
(SO
 
4
)(OH)
 
2
7.BB.40Schuetteite
Hg
2+
3
(SO
 
4
)O
 
2
7.BB.45Paraotwayite
Ni(OH)
 
2-x
(SO
 
4
,CO
 
3
)
 
0.5x
7.BB.50Xocomecatlite
Cu
 
3
(TeO
 
4
)(OH)
 
4
7.BB.55Pauflerite
(V
4+
 
O)SO
 
4
7.BB.60Grandviewite
Cu
 
3
Al
 
9
(SO
 
4
)
 
2
(OH)
 
29
Related Minerals - Hey's Index Grouping:

- +
25.3.1Kieserite
MgSO
 
4
· H
 
2
O
25.3.2Sanderite
MgSO
 
4
· 2H
 
2
O
25.3.3Starkeyite
MgSO
 
4
· 4H
 
2
O
25.3.4Pentahydrite
MgSO
 
4
· 5H
 
2
O
25.3.5Hexahydrite
MgSO
 
4
· 6H
 
2
O
25.3.6Epsomite
MgSO
 
4
· 7H
 
2
O
25.3.8Vanthoffite
Na
 
6
Mg(SO
 
4
)
 
4
25.3.9Blödite
Na
 
2
Mg(SO
 
4
)
 
2
· 4H
 
2
O
25.3.10Konyaite
Na
 
2
Mg(SO
 
4
)
 
2
· 5H
 
2
O
25.3.11Löweite
Na
 
12
Mg
 
7
(SO
 
4
)
 
13
· 15H
 
2
O
25.3.12Uklonskovite
NaMg(SO
 
4
)F · 2H
 
2
O
25.3.13Langbeinite
K
 
2
Mg
 
2
(SO
 
4
)
 
3
25.3.14Leonite
K
 
2
Mg(SO
 
4
)
 
2
· 4H
 
2
O
25.3.15Picromerite
K
 
2
Mg(SO
 
4
)
 
2
· 6H
 
2
O
25.3.16Efremovite
(NH
 
4
)
 
2
Mg
 
2
(SO
 
4
)
 
3
25.3.17Boussingaultite
(NH
 
4
)
 
2
Mg(SO
 
4
)
 
2
· 6H
 
2
O
25.3.18Pickeringite
MgAl
 
2
(SO
 
4
)
 
4
· 22H
 
2
O

Other Names for Caminite

Synonyms:
IMA1983-015
Other Languages:
German:Caminit
Spanish:Caminita

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 Caminite

Reference List:

- +
American Mineralogist: 71: 819-825.

Acta Crystallographica: B37: 1003-1006.

Internet Links for Caminite

Search Engines:
  • Look for Caminite on Google
  • Look for Caminite images on Google
  • External Links:
  • Look for Caminite on Webmineral
  • Look for Caminite on Athena Mineralogy
  • Look for Caminite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Caminite details from Handbook of Mineralogy (PDF)
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  • Localities for Caminite

    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.
    Pacific Ocean
     
    • East Pacific Rise
      • Juan de Fuca Ridge complex
    Am Min 71 (1986), 819
    Russia
     
    • Eastern-Siberian Region
      • Prebaikalia (Pribaikal'e)
        • Irkutskaya Oblast'
          • Lower Tunguska
            • Nepa River basin
    Fersman Museum, Moscow, website.
    Mineral and/or Locality  
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