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Sheldrickite

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

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

Articles/Blogs about Sheldrickite

Internet Links for Sheldrickite

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  • Raman and XRD data at RRUFF project
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    Localities for Sheldrickite

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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
      • Rouville Co.
        • 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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