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Sheldrickite

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Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada
© 2005 DM

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Formula:
NaCa
 
3
(CO
 
3
)
 
2
F
 
3
 · H
 
2
O
System:TrigonalColour:Colourless to white
Lustre:VitreousHardness:3
Name:Named after George M. Sheldrick (b 1942)Professor of Crystallography.
This page provides mineralogical data about Sheldrickite.

Classification of Sheldrickite

IMA status:Approved
Strunz 8th edition ID:5/E.10-05
Nickel-Strunz 10th (pending) edition ID: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

Type Locality:Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada

Physical Properties of Sheldrickite

Lustre: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
Maximum Birefringence:δ = 0.025

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low

Chemical Properties of Sheldrickite

Formula:
NaCa
 
3
(CO
 
3
)
 
2
F
 
3
 · H
 
2
O
Essential elements:C, Ca, F, H, Na, O
All elements listed in formula:C, Ca, F, H, Na, O

Relationship of Sheldrickite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
5.DC.05Ancylite-(Ce)
SrCe(CO
 
3
)
 
2
(OH) · H
 
2
O
5.DC.05Calcioancylite-(Ce)
(Ca,Sr)Ce(CO
 
3
)
 
2
(OH) · H
 
2
O
5.DC.05Calcioancylite-(Nd)
Ca(Nd,La,Ce)(CO
 
3
)
 
2
(OH)
 
.
H
 
2
O
5.DC.05Gysinite-(Nd)
Pb(Nd,La)(CO
 
3
)
 
2
(OH) · H
 
2
O
5.DC.05Ancylite-(La)
Sr(La,Ce)(CO
 
3
)
 
2
(OH) · H
 
2
O
5.DC.05Kozoite-(Nd)
(Nd,La,Sm,Pr)(CO
 
3
)(OH)
5.DC.05Kozoite-(La)
(La,Nd)(CO
 
3
)(OH)
5.DC.10Kamphaugite-(Y)
Ca(Y,REE)(CO
 
3
)
 
2
(OH) · H
 
2
O
5.DC.20Thomasclarkite-(Y)
(Na,Ce)(Y,REE)(HCO
 
3
)(OH)
 
3
 · 4H
 
2
O
5.DC.25Peterbaylissite
(Hg
+
2
)
 
1.5
(CO
 
3
)(OH) · 2H
 
2
O
5.DC.30Clearcreekite
(Hg
+
2
)
 
1.5
(CO
 
3
)(OH) · 2H
 
2
O
5.DC.35Niveolanite
NaBe(CO
 
3
)(OH) · 2H
 
2
O

Other Names for Sheldrickite

Synonyms:
IMA1996-019
Other Languages:
German:Sheldrickit
Russian:Шелдрикит
Spanish:Sheldrickita

Other Information

Health Warning: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:

- +
Mineralogical Record: 28: 486.

Canadian Mineralogist (1997): 35: 181-187.

Internet Links for Sheldrickite

Search Engines:
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    • External Links:
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  • Look for Sheldrickite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Sheldrickite details from Handbook of Mineralogy (PDF)
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    • Localities for Sheldrickite

    The 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.
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    (TL) indicates type locality. ? 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
     
    • Québec
      • Montérégie
        • Rouville 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.
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 19th Jun 2011 01:57:21
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