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Carraraite Mineral Data

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General Carraraite Information

Help on Chemical  Formula: Chemical Formula: Ca3Ge(OH)6(SO4)(CO3 )•12H2 O
Help on Composition: Composition: Molecular Weight = 670.75 gm
   Calcium    17.93 %  Ca   25.08 % CaO
   Germanium  10.83 %  Ge   15.60 % GeO2
   Hydrogen    4.51 %  H    40.29 % H2O
   Carbon      1.61 %  C     5.91 % CO2
   Sulfur      5.26 %  S    13.13 % SO3
   Oxygen     59.87 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca3Ge(OH)6(SO4)1.1(CO3)0.9•12(H2O)
Help on Environment: Environment: Hydrothermal alteration product of Cu-V sulfides in calcite vein cavities within the Carrara marble. A member of the thaumasite and ettringite groups.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Gioia quarry, Colonnata valley, Carrara basin region, Apuan Alps, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Synonym: Synonym: IMA1998-002

Carraraite Image

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Comments: Scanning electron microscope image of tabular, hexagonal carraraite crystals. (AmMin 86:1294).
Location: Marble quarries of the Carrara basin (Apuan Alps, Italy). Scale: See Image.
© American Mineralogist

Carraraite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.96137
Help on Cell Dimensions: Cell Dimensions: a = 11.056, c = 10.629, Z = 2; V = 1,125.17 Den(Calc)= 1.98
Help on Crystal System: Crystal System: Hexagonal Space Group: P 63/m, or P 63
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.57(1)(100), 3.83(0.8)(112), 5.53(0.8)(110),2.74(0.6)(302), 3.56(0.6)(202), 2.38(0.5)(312,132), 2.53(0.5)(213,123), 3.44(0.5)(211,212), 3.2(0.4)(300),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 0 0) ( 0 0 1)

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Physical Properties of Carraraite

Help on Cleavage: Cleavage: None
Help on Color: Color: Milky white.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Hexagonal - Six-sided crystal shape in cross-section or habit.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Carraraite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.008 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2495,KC= 0.2514
Ncalc = 1.5
Help on Optical Data: Optical Data: Uniaxial (+), w=1.479, e=1.509, bire=0.0300.

Calculated Properties of Carraraite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.04 gm/cc
note: Specific Gravity of Carraraite =1.98 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0095514711
Boson Index = 0.9904485289
Help on Photoelectric: Photoelectric: PECarraraite = 8.70 barns/electron
U=PECarraraite x rElectron Density= 17.75 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Carraraite is Not Radioactive

Carraraite Classification

Help on  Dana Class: Dana Class: (32)Compound Sulfates
  (32.04)(hydrous) with poly-anionic formula
  (32.04.04)Charlesite Group Charlesite Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O) P 31c 3m Sturmanite Ca6(Fe,Al,Mn)2(SO4)2[B(OH)4](OH)12•25(H2O) P 31c 3m Jouravskite Ca3Mn(SO4,CO3)2(OH)6•12(H2O) P 63/m 6/m Thaumasite Ca3Si(CO3)(SO4)(OH)6•12(H2O) P 63/m 6/m Carraraite! Ca3Ge(OH)6(SO4)(CO3)•12H2O P 63/m, or P 63 Hex
Help on  Strunz Class: Strunz Class: 07.DG.15 07 - SULFATES (SELENATES, TELLURATES)
  07.D - Sulfates (selenates, etc.) with additional anions, with H2O
  07.DG -With large and medium sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3
07.DG.15 Bentorite Ca6(Cr,Al)2(SO4)3(OH)12•26(H2O) P 63/mmc 6/m 2/m 2/m
07.DG.15 Charlesite Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O) P 31c 3m
07.DG.15 Ettringite Ca6Al2(SO4)3(OH)12•26(H2O) P 63/mmc 6/m 2/m 2/m
07.DG.15 Jouravskite Ca3Mn(SO4,CO3)2(OH)6•12(H2O) P 63/m 6/m
07.DG.15 Sturmanite Ca6(Fe,Al,Mn)2(SO4)2[B(OH)4](OH)12•25(H2O) P 31c 3m
07.DG.15 Thaumasite Ca3Si(CO3)(SO4)(OH)6•12(H2O) P 63/m 6/m
07.DG.15 Buryatite! Ca3(Si,Fe,Al)[SO4][B(OH)4](OH,O)6•12(H2O) P 31c 3m
07.DG.15 Carraraite! Ca3Ge(OH)6(SO4)(CO3)•12H2O P 63/m, or P 63 Hex

Other Carraraite Information

Help on References: References: NAME( AmMin, Vol 86, p 1293-1301) PHYS. PROP.(AmMin, Vol 86, p 1293-1301) OPTIC PROP.(AmMin, Vol 86, p 1293-1301)
Help on See Also: See Also: Links to other databases for Carraraite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Ca3Ge(OH)6(SO4)(CO3 )•12H2 O
Dana No: Strunz No: 07.DG.15





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