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Caminite

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Formula:
Mg7(SO4)5(OH)4 · H2O
System:
Tetragonal
Colour:
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

Approved
7.BB.05

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

31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
10 : Miscellaneous
25.3.7

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

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
Max Birefringence:
δ = 0.002
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of Caminite

Formula:
Mg7(SO4)5(OH)4 · H2O
Essential elements:
All elements listed in formula:

Relationship of Caminite to other Species

7.BB.10HauckiteFe33+(Mg,Mn2+)24Zn18(SO4)4(CO3)2(OH)81
7.BB.15AntleriteCu3(SO4)(OH)4
7.BB.20DolerophaniteCu2(SO4)O
7.BB.25BrochantiteCu4(SO4)(OH)6
7.BB.30VergasovaiteCu3(SO4)(MoO4,SO4)O
7.BB.35Klebelsbergite(SbO)4(SO4)(OH)2
7.BB.40SchuetteiteHg32+(SO4)O2
7.BB.45ParaotwayiteNi(OH)2-x(SO4,CO3)0.5x
7.BB.50XocomecatliteCu3(TeO4)(OH)4
7.BB.55Pauflerite(V4+O)SO4
7.BB.60GrandviewiteCu3Al9(SO4)2(OH)29
25.3.1KieseriteMgSO4 · H2O
25.3.2SanderiteMgSO4 · 2H2O
25.3.3StarkeyiteMgSO4 · 4H2O
25.3.4PentahydriteMgSO4 · 5H2O
25.3.5HexahydriteMgSO4 · 6H2O
25.3.6EpsomiteMgSO4 · 7H2O
25.3.8VanthoffiteNa6Mg(SO4)4
25.3.9BlöditeNa2Mg(SO4)2 · 4H2O
25.3.10KonyaiteNa2Mg(SO4)2 · 5H2O
25.3.11LöweiteNa12Mg7(SO4)13 · 15H2O
25.3.12UklonskoviteNaMg(SO4)F · 2H2O
25.3.13LangbeiniteK2Mg2(SO4)3
25.3.14LeoniteK2Mg(SO4)2 · 4H2O
25.3.15PicromeriteK2Mg(SO4)2 · 6H2O
25.3.16Efremovite(NH4)2Mg2(SO4)3
25.3.17Boussingaultite(NH4)2Mg(SO4)2 · 6H2O
25.3.18PickeringiteMgAl2(SO4)4 · 22H2O

Other Names for Caminite

Name in Other Languages:
German:Caminit
Spanish:Caminita

Other Information

Health Risks:
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

Localities for Caminite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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 (TL)
 
  • 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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