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Sheldrickite

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About SheldrickiteHide

George M. Sheldrick
Formula:
NaCa3(CO3)2F3 · H2O
Colour:
Colourless to white
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
2.86
Crystal System:
Trigonal
Name:
Named in honor of George Michael Sheldrick (b 1942), Professor of Crystallography University of Gottingen, Germany. Sheldrick is the creator of computer programs widely used for the analysis of crystal structures. Determination of the structure of this mineral required the software's capability of handling twinned crystals.
This page provides mineralogical data about Sheldrickite.


Classification of SheldrickiteHide

Approved
Approval Year:
1996
First Published:
1997
5.DC.15

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

Physical Properties of SheldrickiteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Colourless to white
Hardness:
Tenacity:
Brittle
Parting:
Good {001}
Fracture:
Irregular/Uneven
Density:
2.86 g/cm3 (Measured)    2.86 g/cm3 (Calculated)
Comment:
Measured by displacement in toluene

Optical Data of SheldrickiteHide

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 SheldrickiteHide

Formula:
NaCa3(CO3)2F3 · H2O

Crystallography of SheldrickiteHide

Crystal System:
Trigonal
Class (H-M):
3 - Pyramidal
Space Group:
P32
Setting:
P32
Cell Parameters:
a = 6.718 Å, c = 15.050 Å
Ratio:
a:c = 1 : 2.24
Unit Cell V:
588.3 ų
Z:
3
Twinning:
By reflection on {001}

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.809 (30)
5.010 (30)
3.358 (30)
2.791 (50)
2.508 (40)
2.010 (100)
1.939 (40)

Type Occurrence of SheldrickiteHide

Place of Conservation of Type Material:
Canadian Museum of Nature, nos. CMNMI 81530, CMNMI 81537, CMNMI 81538 and CMNMI 8153
Geological Setting of Type Material:
Late-stage hydrothermal infilling in a Marble xenolith in nepheline syenite, close to a large unit of hornfels.
Associated Minerals at Type Locality:
Reference:
Grice, J.D., Gault, R.A., Van Velthuizen, J. (1997) Sheldrickite, a new sodium-calcium-fluorocarbonate mineral species from Mont Saint-Hilaire, Quebec. Canadian Mineralogist: 35: 181-187.

Synonyms of SheldrickiteHide

Other Language Names for SheldrickiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Pectolite2 photos of Sheldrickite associated with Pectolite on mindat.org.
Shortite2 photos of Sheldrickite associated with Shortite on mindat.org.
Aegirine1 photo of Sheldrickite associated with Aegirine on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

5.DC.05Ancylite-(Ce)CeSr(CO3)2(OH) · H2OOrth. mmm (2/m 2/m 2/m)
5.DC.05Calcioancylite-(Ce)(Ce,Ca,Sr)CO3(OH,H2O)Orth. mmm (2/m 2/m 2/m)
5.DC.05Calcioancylite-(Nd)Ca(Nd,La,Ce)(CO3)2(OH).H2OMon. m : Pm
5.DC.05Gysinite-(Nd)PbNd(CO3)2(OH) · H2OOrth. mmm (2/m 2/m 2/m)
5.DC.05Ancylite-(La)LaSr(CO3)2(OH) · H2OOrth. mmm (2/m 2/m 2/m)
5.DC.05Kozoite-(Nd)(Nd,La,Sm,Pr)(CO3)(OH)Orth. mmm (2/m 2/m 2/m)
5.DC.05Kozoite-(La)(La,Nd)(CO3)(OH)Orth.
5.DC.10Kamphaugite-(Y)Ca(Y,REE)(CO3)2(OH) · H2OTet. 4 2 2 : P41 21 2
5.DC.20Thomasclarkite-(Y)(Na,Ce)(Y,REE)(HCO3)(OH)3 · 4H2OMon. 2 : P2
5.DC.25Peterbaylissite(Hg+2)1.5(CO3)(OH) · 2H2OOrth.
5.DC.30Clearcreekite(Hg+2)1.5(CO3)(OH) · 2H2OMon.
5.DC.35NiveolaniteNaBe(CO3)(OH) · 2H2OTet. 4/mmm (4/m 2/m 2/m) : P4/mcc

Fluorescence of SheldrickiteHide

Other InformationHide

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 SheldrickiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Grice, J.D., Gault, R.A., 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 SheldrickiteHide

Localities for SheldrickiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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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