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Crawfordite

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Formula:
Na
 
3
Sr(CO
 
3
)(PO
 
4
)
System:MonoclinicColour:Colourless
Lustre:VitreousHardness:3
Name:Named in 1994 by Alexander Petrovich Khomyakov, L. I. Polezhaeva, and E. V. Sokolova in honor of Sir Adair Crawford [1748 Crumlin, County Antrim, Northern Ireland, United Kingdom - July 29, 1795 Lymington, England, United Kingdom] professor of chemistry at the Royal Military Academy, London, England as well as a staff physician at St. Thomas Hospital, also in London. He researched and made many contributions to calorimetry and specific heats. He was co-discoverer of strontium.


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·
mindat.org URL:http://www.mindat.org/min-1148.html
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Type Occurrence of Crawfordite

Type Locality:Koashva quarry, 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
)
Simplified for copy/paste:Na3Sr(CO3)(PO4)
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

Search Engines:
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  • External Links:
  • Look for Crawfordite on Webmineral
  • Look for Crawfordite on Athena Mineralogy
  • Look for Crawfordite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Crawfordite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
  • Crawfordite specimens for sale - minfind.com
  • Fabre Minerals - search for Crawfordite specimens
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  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
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  • Fine and rare minerals from mintreasure.com
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  • Find Crawfordite on www.crystalclassics.co.uk
  • Buy fine minerals and gemstones from Pala International
  • SpiriferMinerals.com - high quality low prices
  • 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.
    (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
            • Koashva Mt
    [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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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. 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 thousands 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.
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