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Sheldrickite Mineral Data
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General Sheldrickite Information
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Chemical Formula: |
NaCa3(CO3)2F3•(H2O) |
Composition: |
Molecular Weight = 338.25 gm |
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Sodium 6.80 % Na 9.16 % Na2O |
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Calcium 35.55 % Ca 49.74 % CaO |
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Hydrogen 0.60 % H 5.33 % H2O |
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Carbon 7.10 % C 26.02 % CO2 |
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Oxygen 33.11 % O |
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Fluorine 16.85 % F 16.85 % F |
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- %
F -7.10 % -O=F2 |
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______ ______ |
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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 |
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IMA1996-019 |
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Sheldrickite Crystallography
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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 - Pyramidal H-M Symbol (3) Space Group: P 32 |
X Ray Diffraction: |
By Intensity(I/Io): 2.01(1), 2.791(0.5), 2.508(0.4), |
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Physical Properties of Sheldrickite
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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 |
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Optical Properties of Sheldrickite
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Optical Data: |
Uniaxial (+), w=1.538, e=1.563, bire=0.0250. |
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Calculated Properties of Sheldrickite
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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: |
PESheldrickite = 4.67 barns/electron U=PESheldrickite x rElectron Density= 13.27 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Sheldrickite is Not Radioactive |
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Sheldrickite Classification
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Dana Class: |
16a.03.11.01 (16a)Carbonates - Hydroxyl or Halogen |
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(16a.03)where (A B)2 (XO3) Zq |
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(16a.03.11)Dana Group |
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16a.03.11.01 Sheldrickite! NaCa3(CO3)2F3•(H2O) P 32 3 |
Strunz Class: |
05.DC.15 05 - CARBONATES (NITRATES) |
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05.D - Carbonates with Additional Anions, with H2O |
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05.DC -With large cations |
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05.DC.15 Sheldrickite! NaCa3(CO3)2F3•(H2O) P 32 3 |
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Other Sheldrickite Information
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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
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Print or Cut-and-Paste your Sheldrickite Specimen Label here :
Sheldrickite
NaCa3(CO3)2F3•(H2O)
Dana No: 16a.03.11.01 Strunz No: 05.DC.15
Locality:
Notes:
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