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Crawfordite

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Big Photo

Koashva Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
© 2008, JGW




Formula:
Na
 
3
Sr(CO
 
3
)(PO
 
4
)
System:MonoclinicColour:Colourless
Lustre:VitreousHardness:3


Found in hyperagpaitic pegmatites

Classification of Crawfordite

IMA status:Approved
Strunz 8th edition ID:5/C.04-40
Nickel-Strunz 10th (pending) edition ID:5.BF.10

5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
F : With (Cl), SO4, PO4, TeO3
Dana 8th edition ID:43.2.1.4

43 : COMPOUND PHOSPHATES, ETC.
2 : Anhydrous Normal Compound Phosphates, etc·
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Type Occurrence of Crawfordite

Type Locality:Koashva Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
Year of Discovery:1994

Physical Properties of Crawfordite

Lustre:Vitreous
Colour:Colourless
Streak:White
Hardness (Mohs):3

Crystallography of Crawfordite

Crystal System:Monoclinic
Cell Parameters:a = 9.18Å, b = 6.7Å, c = 5.27Å
β = 89.98°
Ratio:a:b:c = 1.37 : 1 : 0.787
Unit Cell Volume:V 324.14 ų (Calculated from Unit Cell)

Optical Data of Crawfordite

Type:Biaxial (-)
RI values: nα = 1.520 nβ = 1.564 nγ = 1.565
2V:Measured: 20° , Calculated: 16°
Maximum Birefringence:δ = 0.045

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

Chemical Properties of Crawfordite

Formula:
Na
 
3
Sr(CO
 
3
)(PO
 
4
)
Essential elements:C, Na, O, P, Sr
All elements listed in formula:C, Na, O, P, Sr

Relationship of Crawfordite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
5.BF.05Ferrotychite
Na
 
6
(Fe,Mn,Mg)
 
2
(CO
 
3
)
 
4
(SO
 
4
)
5.BF.05Manganotychite
Na
 
6
Mn
 
2
(CO
 
3
)
 
4
(SO
 
4
)
5.BF.05Northupite
Na
 
3
Mg(CO
 
3
)
 
2
Cl
5.BF.05Tychite
Na
 
6
Mg
 
2
(CO
 
3
)
 
4
(SO
 
4
)
5.BF.10Bonshtedtite
Na
 
3
Fe
2+
 
(CO
 
3
)(PO
 
4
)
5.BF.10Bradleyite
Na
 
3
Mg(CO
 
3
)(PO
 
4
)
5.BF.10Sidorenkite
Na
 
3
Mn
2+
 
(CO
 
3
)(PO
 
4
)
5.BF.15Daqingshanite-(Ce)
(Sr,Ca,Ba)
 
3
(Ce,La)(CO
 
3
)
 
3-x
(PO
 
4
)(OH,F)
 
2x
5.BF.20Reederite-(Y)
(Na,Mn)
 
15
Y
 
2
(CO
 
3
)
 
9
(FSO
 
3
)Cl
5.BF.25Mineevite-(Y)
Na
 
25
Ba(Y,Gd,Dy)
 
2
(CO
 
3
)
 
11
(HCO
 
3
)
 
4
(SO
 
4
)
 
2
F
 
2
Cl
5.BF.30Brianyoungite
Zn
 
3
(CO
 
3
,SO
 
4
)(OH)
 
4
5.BF.35Philolithite
Pb
 
12
Mn
2+
 
(Mg,Mn
2+
 
)
 
2
(Mn
2+
 
,Mg)
 
4
(CO
 
3
)
 
4
(SO
 
4
)O
 
6
(OH)
 
12
Cl
 
4
5.BF.40Leadhillite
Pb
 
4
(CO
 
3
)
 
2
(SO
 
4
)(OH)
 
2
5.BF.40Macphersonite
Pb
 
4
(CO
 
3
)
 
2
(SO
 
4
)(OH)
 
2
5.BF.40Susannite
Pb
 
4
(CO
 
3
)
 
2
(SO
 
4
)(OH)
 
2

Other Names for Crawfordite

Synonyms:
IMA1993-030
Other Languages:
German:Crawfordit
Russian:Крофордит
Spanish:Crawfordita

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 Crawfordite

Reference List:

- +
New Minerals (1997), New Minerals 1990-1994.

Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 123(3): 107-111.

Internet Links for Crawfordite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Crawfordite details from Handbook of Mineralogy (PDF)
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    • Localities for Crawfordite

    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.
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Khibiny Massif
    		[MinRec 27:202]; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
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