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Thaumasite Mineral Data

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General Thaumasite Information

Help on Chemical  Formula: Chemical Formula: Ca3Si(CO3)(SO4)(OH)6•12(H2O)
Help on Composition: Composition: Molecular Weight = 622.62 gm
   Calcium   19.31 %  Ca   27.02 % CaO
   Silicon    4.51 %  Si    9.65 % SiO2
   Hydrogen   4.86 %  H    43.40 % H2O
   Carbon     1.93 %  C     7.07 % CO2
   Sulfur     5.15 %  S    12.86 % SO3
   Oxygen    64.24 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca3Si(CO3)(SO4)(OH)6•12(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1878
Help on Locality: Locality: Bjelke mine, near Areskutan, Jamtland, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek thaumasion - "surprising" in allusion to the chemical composition.
Help on Name Pronunciation: Name Pronunciation: Thaumasite + Pronunciation Say THAUMASITE
Help on Synonym: Synonym: ICSD 31247
  PDF 25-128
 

Thaumasite Image

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  Thaumasite

Comments: Doubly-terminated Thaumasite.
Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 1 cm across.
© John Veevaert

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  Thaumasite

Comments: Transparent crystal of thaumasite.
Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 1.1 x 0.4 cm.
© John Veevaert

Thaumasite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.94288
Help on Cell Dimensions: Cell Dimensions: a = 11.03, c = 10.4, Z = 2; V = 1,095.76 Den(Calc)= 1.89
Help on Crystal System: Crystal System: Hexagonal - Dipyramidal H-M Symbol (6/m) Space Group: P 63/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.56(1), 5.51(0.4), 3.41(0.2),
 

Physical Properties of Thaumasite

Help on Cleavage: Cleavage: {???} Poor
Help on Color: Color: Colorless, White.
Help on Density: Density: 1.88 - 1.9, Average = 1.89
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Massive - Fibrous - Distinctly fibrous fine-grained forms.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luminescence: Luminescence: Fluorescent, Long UV=dull uneven white.
Help on Luster: Luster: Vitreous - Silky
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white
 

Optical Properties of Thaumasite

Help on Dichroism (e): Dichroism (e): none.
Help on Dichroism (w): Dichroism (w): none.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2579,KPDmeas= 0.2579,KC= 0.2621
Ncalc = 1.49 - 1.5
Help on Optical Data: Optical Data: Uniaxial (-), e=1.468, w=1.507, bire=0.0390.
 

Calculated Properties of Thaumasite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.98 gm/cc
note: Specific Gravity of Thaumasite =1.89 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0032813823
Boson Index = 0.9967186177
Help on Photoelectric: Photoelectric: PEThaumasite = 2.91 barns/electron
U=PEThaumasite x rElectron Density= 5.75 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Thaumasite is Not Radioactive
 

Thaumasite Classification

Help on  Dana Class: Dana Class: 32.04.04.04 (32)Compound Sulfates
  (32.04)(hydrous) with poly-anionic formula
  (32.04.04)Charlesite Group
 
32.04.04.01 Charlesite Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O) P 31c 3m
 
32.04.04.02 Sturmanite Ca6(Fe,Al,Mn)2(SO4)2[B(OH)4](OH)12•25(H2O) P 31c 3m
 
32.04.04.03 Jouravskite Ca3Mn(SO4,CO3)2(OH)6•12(H2O) P 63/m 6/m
 
32.04.04.04 Thaumasite Ca3Si(CO3)(SO4)(OH)6•12(H2O) P 63/m 6/m
 
32.04.04.05 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 Thaumasite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Thaumasite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - EUROmin Project
7 - Ecole des Mines de Paris
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - WWW-MINCRYST

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Print or Cut-and-Paste your Thaumasite Specimen Label here :

Thaumasite

Ca3Si(CO3)(SO4)(OH)6•12(H2O)
Dana No: 32.04.04.04 Strunz No: 07.DG.15
Locality:

 

Notes:

 

 
   
 


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