Sheldrickite Mineral Data

Sheldrickite Mineral Data +

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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.

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

$Help on X Ray Diffraction:$ 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

Diaphaniety:

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

Gladstone-Dale:

CI meas= 0.051 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.051 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1925,KPDmeas= 0.1925,KC= 0.2028

Optical Data:

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

Calculated Properties of Sheldrickite

Electron Density:

r_electron=2.84 gm/cc
note: r_Sheldrickite=2.86 gm/cc.

Fermion Index

Fermion Index = 0.00142
Boson Index = 0.99858

Photoelectric:

PE_Sheldrickite= 4.67 barns/electron
U=PE_Sheldrickite x r_electron= 13.27 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Sheldrickite is Not Radioactive

Sheldrickite Classification

Dana Class:

16a.3.11.1 (16a)Carbonates - Hydroxyl or Halogen

(16a.3)where (A B)2 (XO3) Zq

(16a.3.11)Dana Group

16a.3.11.1 Sheldrickite ! NaCa3(CO3)2F3·(H2O) P 3₂ 3

Strunz Class:

V/C.06-27 V - Nitrates, Carbonates and Borates

V/C - Waterfree carbonates with unfamiliar anions

V/C.06 - Brenkite - Defernite series

V/C.06-10 Brenkite Ca2(CO3)F2 P bcn 2/m 2/m 2/m

V/C.06-20 Holdawayite Mn6(CO3)2(OH)7(Cl,OH) C 2/m 2/m

V/C.06-25 Rouvilleite Na3Ca2(CO3)3F Cc,C 2/c Mono

V/C.06-27 Sheldrickite NaCa3(CO3)2F3·(H2O) P 3₂ 3

V/C.06-30 Defernite Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x(x=0,5) Pnam 2/m 2/m 2/m

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 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST

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

Sheldrickite

NaCa3(CO3)2F3·(H2O)
Dana No: 16a.3.11.1 Strunz No: V/C.06-27
Locality:

Notes: