Sheldrickite Mineral Data

General Sheldrickite Information

Chemical Formula: NaCa3(CO3)2F3•(H2O) 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 Empirical Formula: NaCa₃(CO₃)₂F₃•(H₂O) Environment: Found in a marble xenolith in the nepheline syenite intrusive unit close to a large unit of hornfels. A late stage hydrothermal infilling IMA Status: Approved IMA 1996 (Dana # Added) Locality: Poudrette quarry, Mont Saint-Hilaire, Rouville Co., Quebec, Canada. Link to MinDat.org Location Data. Name Origin: Named for George M. Sheldrick, creator of the SHELX software, widely used for the refinement of crystal structures. Name Pronunciation: Sheldrickite + Pronunciation Synonym: ICSD 76858   IMA1996-019  

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Sheldrickite Crystallography

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

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Grice J D , Gault R A , Van Velthuizen J , The Canadian Mineralogist , 35 (1997) p.181-187, Sheldrickite, a new sodium-calcium-fluorocarbonate mineral, species from Mont Saint-Hilaire, Quebec, Locality: Mont Saint-Hilaire, Quebec, Canada

 

Physical Properties of Sheldrickite

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

Optical Properties of Sheldrickite

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

Calculated Properties of Sheldrickite

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

Sheldrickite Classification

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

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

References: NAME( CanMin) PHYS. PROP.(Min.Mag.,Vol.61,p732,1997) OPTIC PROP.(Min.Mag.,Vol.61,p732,1997) 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
15 - WWW-MINCRYST
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

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