Mineralogy Database

Sheldrickite Mineral Data

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General Sheldrickite Information

Help on Chemical  Formula: Chemical Formula: NaCa3(CO3)2F3•(H2O)
Help on Composition: Composition: Molecular Weight = 338.25 gm
   Sodium     6.80 %  Na    9.16 % Na2O
   Calcium   35.55 %  Ca   49.74 % CaO
   Hydrogen   0.60 %  H     5.33 % H2O
   Carbon     7.10 %  C    26.02 % CO2
   Oxygen    33.11 %  O
   Fluorine  16.85 %  F    16.85 % F
               -   %   F    -7.10 % -O=F2    
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaCa3(CO3)2F3•(H2O)
Help on Environment: Environment: Found in a marble xenolith in the nepheline syenite intrusive unit close to a large unit of hornfels. A late stage hydrothermal infilling
Help on IMA Status: IMA Status: Approved IMA 1996 (Dana # Added)
Help on Locality: Locality: Poudrette quarry, Mont Saint-Hilaire, Rouville Co., Quebec, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for George M. Sheldrick, creator of the SHELX software, widely used for the refinement of crystal structures.
Help on Name Pronunciation: Name Pronunciation: Sheldrickite + Pronunciation Say SHELDRICKITE
Help on Synonym: Synonym: ICSD 76858

Sheldrickite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.24025
Help on Cell Dimensions: Cell Dimensions: a = 6.718, c = 15.05, Z = 3; V = 588.23 Den(Calc)= 2.86
Help on Crystal System: Crystal System: Trigonal - Pyramidal H-M Symbol (3) Space Group: P 32
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.01(1), 2.791(0.5), 2.508(0.4),

Physical Properties of Sheldrickite

Help on Cleavage: Cleavage: {001} Good
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.86
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Blocky - Crystal shape tends to be equant (e.g. feldspars).
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Sheldrickite

Help on Optical Data: Optical Data: Uniaxial (+), w=1.538, e=1.563, bire=0.0250.

Calculated Properties of Sheldrickite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.84 gm/cc
note: Specific Gravity of Sheldrickite =2.86 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0014208854
Boson Index = 0.9985791146
Help on Photoelectric: Photoelectric: PESheldrickite = 4.67 barns/electron
U=PESheldrickite x rElectron Density= 13.27 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sheldrickite is Not Radioactive

Sheldrickite Classification

Help on  Dana Class: Dana Class: 16a.03.11.01 (16a)Carbonates - Hydroxyl or Halogen
  (16a.03)where (A B)2 (XO3) Zq
  (16a.03.11)Dana Group
16a.03.11.01 Sheldrickite! NaCa3(CO3)2F3•(H2O) P 32 3
Help on  Strunz Class: Strunz Class: 05.DC.15 05 - CARBONATES (NITRATES)
  05.D - Carbonates with Additional Anions, with H2O
  05.DC -With large cations
05.DC.15 Sheldrickite! NaCa3(CO3)2F3•(H2O) P 32 3

Other Sheldrickite Information

Help on References: References: NAME( CanMin) PHYS. PROP.(Min.Mag.,Vol.61,p732,1997) OPTIC PROP.(Min.Mag.,Vol.61,p732,1997)
Help on See Also: See Also: Links to other databases for Sheldrickite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: 16a.03.11.01 Strunz No: 05.DC.15





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