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Ca3(SO4)[Ge(OH)6](CO3) · 12H2O
Named for the type locality, marble quarries in Carrara basin, Apuan Alps, Italy
The Ge analogue of thaumasite.

Classification of Carraraite


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

4 : Hydrated Compound Sulfates containing Hydroxyl or Halogen URL:
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Type Occurrence of Carraraite

Physical Properties of Carraraite


Crystallography of Carraraite

Crystal System:

Optical Data of Carraraite

Uniaxial (+)
RI values:
nω = 1.479 nε = 1.509
Max Birefringence:
δ = 0.030
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of Carraraite

Ca3(SO4)[Ge(OH)6](CO3) · 12H2O
Essential elements:
All elements listed in formula:

Relationship of Carraraite to other Species

Other Members of Group:
BentoriteCa6(Cr3+,Al)2(SO4)3(OH)12 · 26H2O
BuryatiteCa3(Si,Fe,Al)(SO4)[B(OH)4]O(OH)5 · 12H2O
CharlesiteCa6(Al,Si)2(SO4)2[B(OH)4](OH,O)12 · 26H2O
EttringiteCa6Al2(SO4)3(OH)12 · 26H2O
HielscheriteCa3Si(SO4)(SO3)(OH)6 · 11H2O
ImayoshiiteCa3Al(CO3)[B(OH)4](OH)6 · 12H2O
JouravskiteCa3Mn4+(SO4}(CO3)(OH)6 · 12H2O
KottenheimiteCa 3Si(SO4)2(OH)6·12H2O
Micheelsenite(Ca,Y)3Al(HPO4,CO3)(CO3)(OH)6 · 12H2O
SturmaniteCa6(Fe3+,Al,Mn3+)2(SO4)2[B(OH)4](OH)12 · 25H2O
ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2O
7.DG.05DarapskiteNa3(SO4)(NO3) · H2O
7.DG.10Clinoungemachite(Na, K, Fe, SO4)
7.DG.10HumberstoniteNa7K3Mg2(SO4)6(NO3)2 · 6H2O
7.DG.10UngemachiteK3Na8Fe(SO4)6(NO3)2 · 6H2O
7.DG.15BentoriteCa6(Cr3+,Al)2(SO4)3(OH)12 · 26H2O
7.DG.15CharlesiteCa6(Al,Si)2(SO4)2[B(OH)4](OH,O)12 · 26H2O
7.DG.15EttringiteCa6Al2(SO4)3(OH)12 · 26H2O
7.DG.15JouravskiteCa3Mn4+(SO4}(CO3)(OH)6 · 12H2O
7.DG.15SturmaniteCa6(Fe3+,Al,Mn3+)2(SO4)2[B(OH)4](OH)12 · 25H2O
7.DG.15ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2O
7.DG.15BuryatiteCa3(Si,Fe,Al)(SO4)[B(OH)4]O(OH)5 · 12H2O
7.DG.20RapidcreekiteCa2(SO4)(CO3) · 4H2O
7.DG.20KorkinoiteCa4(SO4)2(CO3)2 · 9(H2O)
7.DG.25TatarskiteCa6Mg2(SO4)2(CO3)2(OH)4Cl4 · 7H2O
7.DG.30NakauriiteCu8(SO4)4(CO3)(OH)6 · 48H2O
7.DG.35Chessexite(Na,K)4Ca2(Mg,Zn)3Al8(SO4)10(SiO4)2 · 40H2O
7.DG.40CarlosruiziteK6(Na,K)4Na6Mg10(SeO4)12(IO3)12 · 12H2O
7.DG.40FuenzalidaiteK6(Na,K)4Na6Mg10(SO4)12(IO3)12 · 12H2O
7.DG.45Chelyabinskite(Ca,Mg)3(SO4,CO3)2[Si(OH)6] · 9H2O (?)

Other Names for Carraraite

Name in Other Languages:

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 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

Localities for Carraraite

(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.
  • 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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