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Carraraite

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Formula:
Ca
 
3
(SO
 
4
)[Ge(OH)
 
6
](CO
 
3
) · 12H
 
2
O
System:HexagonalColour:White
Lustre:Vitreous
Member of:Ettringite Group
Name:Named for the type locality, marble quarries in Carrara basin, Apuan Alps, Italy


The Ge analogue of thaumasite.

Classification of Carraraite

IMA status:Approved
Strunz 9th edition ID:7.DG.15
Nickel-Strunz 10th (pending) edition ID:7.DG.15

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
G : With large and medium-sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3
Dana 8th edition ID:32.4.4.6

32 : COMPOUND SULFATES
4 : Hydrated Compound Sulfates containing Hydroxyl or Halogen
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Type Occurrence of Carraraite

Type Locality:Gioia quarries, Casette, Massa, Apuan Alps, Massa-Carrara Province, Tuscany, Italy

Physical Properties of Carraraite

Lustre:Vitreous
Colour:White
Streak:White

Crystallography of Carraraite

Crystal System:Hexagonal

Optical Data of Carraraite

Type:Uniaxial (+)
RI values: nω = 1.479 nε = 1.509
Maximum Birefringence:δ = 0.030

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

Chemical Properties of Carraraite

Formula:
Ca
 
3
(SO
 
4
)[Ge(OH)
 
6
](CO
 
3
) · 12H
 
2
O
Simplified for copy/paste:Ca3(SO4)[Ge(OH)6](CO3)·12H2O
Essential elements:C, Ca, Ge, H, O, S
All elements listed in formula:C, Ca, Ge, H, O, S

Relationship of Carraraite to other Species

Member of:Ettringite Group
Other Members of Group:

- +
Bentorite
Ca
 
6
(Cr
3+
 
,Al)
 
2
(SO
 
4
)
 
3
(OH)
 
12
· 26H
 
2
O
Buryatite
Ca
 
3
(Si,Fe,Al)(SO
 
4
)[B(OH)
 
4
]O(OH)
 
5
· 12H
 
2
O
Charlesite
Ca
 
6
(Al,Si)
 
2
(SO
 
4
)
 
2
[B(OH)
 
4
](OH,O)
 
12
· 26H
 
2
O
Ettringite
Ca
 
6
Al
 
2
(SO
 
4
)
 
3
(OH)
 
12
· 26H
 
2
O
Hielscherite
Ca
 
3
Si(SO
 
4
)(SO
 
3
)(OH)
 
6
· 11H
 
2
O
Imayoshiite
Ca
 
3
Al(CO
 
3
)[B(OH)
 
4
](OH)
 
6
· 12H
 
2
O
Jouravskite
Ca
 
3
Mn
4+
 
(SO
 
4
}(CO
 
3
)(OH)
 
6
· 12H
 
2
O
Kottenheimite
Ca
 
3
Si(SO
 
4
)
 
2
(OH)
 
6
·12H
 
2
O
Micheelsenite
(Ca,Y)
 
3
Al(HPO
 
4
,CO
 
3
)(CO
 
3
)(OH)
 
6
· 12H
 
2
O
Sturmanite
Ca
 
6
(Fe
3+
 
,Al,Mn
3+
 
)
 
2
(SO
 
4
)
 
2
[B(OH)
 
4
](OH)
 
12
· 25H
 
2
O
Thaumasite
Ca
 
3
(SO
 
4
)[Si(OH)
 
6
](CO
 
3
) · 12H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
7.DG.05Darapskite
Na
 
3
(SO
 
4
)(NO
 
3
) · H
 
2
O
7.DG.10Clinoungemachite
(Na, K, Fe, SO
 
4
)
7.DG.10Humberstonite
Na
 
7
K
 
3
Mg
 
2
(SO
 
4
)
 
6
(NO
 
3
)
 
2
· 6H
 
2
O
7.DG.10Ungemachite
K
 
3
Na
 
8
Fe(SO
 
4
)
 
6
(NO
 
3
)
 
2
· 6H
 
2
O
7.DG.15Bentorite
Ca
 
6
(Cr
3+
 
,Al)
 
2
(SO
 
4
)
 
3
(OH)
 
12
· 26H
 
2
O
7.DG.15Charlesite
Ca
 
6
(Al,Si)
 
2
(SO
 
4
)
 
2
[B(OH)
 
4
](OH,O)
 
12
· 26H
 
2
O
7.DG.15Ettringite
Ca
 
6
Al
 
2
(SO
 
4
)
 
3
(OH)
 
12
· 26H
 
2
O
7.DG.15Jouravskite
Ca
 
3
Mn
4+
 
(SO
 
4
}(CO
 
3
)(OH)
 
6
· 12H
 
2
O
7.DG.15Sturmanite
Ca
 
6
(Fe
3+
 
,Al,Mn
3+
 
)
 
2
(SO
 
4
)
 
2
[B(OH)
 
4
](OH)
 
12
· 25H
 
2
O
7.DG.15Thaumasite
Ca
 
3
(SO
 
4
)[Si(OH)
 
6
](CO
 
3
) · 12H
 
2
O
7.DG.15Buryatite
Ca
 
3
(Si,Fe,Al)(SO
 
4
)[B(OH)
 
4
]O(OH)
 
5
· 12H
 
2
O
7.DG.20Rapidcreekite
Ca
 
2
(SO
 
4
)(CO
 
3
) · 4H
 
2
O
7.DG.20Korkinoite
Ca
 
4
(SO
 
4
)
 
2
(CO
 
3
)
 
2
· 9(H
 
2
O)
7.DG.25Tatarskite
Ca
 
6
Mg
 
2
(SO
 
4
)
 
2
(CO
 
3
)
 
2
(OH)
 
4
Cl
 
4
· 7H
 
2
O
7.DG.30Nakauriite
Cu
 
8
(SO
 
4
)
 
4
(CO
 
3
)(OH)
 
6
· 48H
 
2
O
7.DG.35Chessexite
(Na,K)
 
4
Ca
 
2
(Mg,Zn)
 
3
Al
 
8
(SO
 
4
)
 
10
(SiO
 
4
)
 
2
· 40H
 
2
O
7.DG.40Carlosruizite
K
 
6
(Na,K)
 
4
Na
 
6
Mg
 
10
(SeO
 
4
)
 
12
(IO
 
3
)
 
12
· 12H
 
2
O
7.DG.40Fuenzalidaite
K
 
6
(Na,K)
 
4
Na
 
6
Mg
 
10
(SO
 
4
)
 
12
(IO
 
3
)
 
12
· 12H
 
2
O
7.DG.45Chelyabinskite
(Ca,Mg)
 
3
(SO
 
4
,CO
 
3
)
 
2
[Si(OH)
 
6
] · 9H
 
2
O (?)

Other Names for Carraraite

Synonyms:
IMA1998-002
Other Languages:
German:Carrarait
Russian:Каррараит
Spanish:Carraraita

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 Carraraite

Reference List:

- +
Merlino, S. & Orlandi, P. (2001): Carraraite and zaccagnaite, two new minerals from the Carrara marble quarries: their chemical compositions, physical properties, and structural features. American Mineralogist, 86, 1293-1301.

Internet Links for Carraraite

Search Engines:
  • Look for Carraraite on Google
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  • External Links:
  • Look for Carraraite on Webmineral
  • Look for Carraraite on Athena Mineralogy
  • Look for Carraraite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Carraraite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Fine and rare minerals from mintreasure.com
  • The Arkenstone - Fine Minerals
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  • Buy minerals from YourMineralCollection
  • Carraraite specimens for sale - minfind.com
  • Buy from Dave Bunk Minerals
  • Localities for Carraraite

    (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.
    Italy
     
    • Tuscany
      • Massa-Carrara Province
        • Apuan Alps
    Orlandi, P. & Criscuolo, A. (2009). Minerali del marmo delle Alpi Apuane. Pacini editore, Pisa, 180 pp.
          • Massa
            • Casette
    [MinRec 33:162]; Merlino, S. & Orlandi, P. (2001): Carraraite and zaccagnaite, two new minerals from the Carrara marble quarries: their chemical compositions, physical properties, and structural features. American Mineralogist, 86, 1293-1301.
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