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Sheldrickite

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Formula:
NaCa3(CO3)2F3 · H2O
System:
Trigonal
Colour:
Colourless to white
Lustre:
Vitreous
Hardness:
3
Name:
Named after George M. Sheldrick (b 1942)Professor of Crystallography.
This page provides mineralogical data about Sheldrickite.

Classification of Sheldrickite

Approved
5.DC.15

5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
C : With large cations
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Type Occurrence of Sheldrickite

Physical Properties of Sheldrickite

Vitreous
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Colourless to white
Hardness (Mohs):
3

Crystallography of Sheldrickite

Crystal System:
Trigonal

Optical Data of Sheldrickite

Type:
Uniaxial (+)
RI values:
nω = 1.538 nε = 1.563
Max Birefringence:
δ = 0.025
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of Sheldrickite

Formula:
NaCa3(CO3)2F3 · H2O
Essential elements:
All elements listed in formula:

Relationship of Sheldrickite to other Species

5.DC.05Ancylite-(Ce)SrCe(CO3)2(OH) · H2O
5.DC.05Calcioancylite-(Ce)(Ca,Sr)Ce(CO3)2(OH) · H2O
5.DC.05Calcioancylite-(Nd)Ca(Nd,La,Ce)(CO3)2(OH).H2O
5.DC.05Gysinite-(Nd)Pb(Nd,La)(CO3)2(OH) · H2O
5.DC.05Ancylite-(La)Sr(La,Ce)(CO3)2(OH) · H2O
5.DC.05Kozoite-(Nd)(Nd,La,Sm,Pr)(CO3)(OH)
5.DC.05Kozoite-(La)(La,Nd)(CO3)(OH)
5.DC.10Kamphaugite-(Y)Ca(Y,REE)(CO3)2(OH) · H2O
5.DC.20Thomasclarkite-(Y)(Na,Ce)(Y,REE)(HCO3)(OH)3 · 4H2O
5.DC.25Peterbaylissite(Hg2+)1.5(CO3)(OH) · 2H2O
5.DC.30Clearcreekite(Hg2+)1.5(CO3)(OH) · 2H2O
5.DC.35NiveolaniteNaBe(CO3)(OH) · 2H2O

Other Names for Sheldrickite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Sheldrickite

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

Internet Links for Sheldrickite

Localities for Sheldrickite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Canada (TL)
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Grice, J.D., Gault, R.A. and Van Velthuizen, J. (1997), Sheldrickite, a new sodium-calcium-fluorocarbonate mineral species from Mont Saint-Hilaire, Quebec. Canadian Mineralogist: 35: 181-187.
Mineral and/or Locality  
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