Crawfordite
A valid IMA mineral species
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About Crawfordite
Formula:
Na3Sr(CO3)(PO4)
Colour:
Colourless
Lustre:
Sub-Vitreous
Hardness:
3
Specific Gravity:
3.05
Crystal System:
Monoclinic
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
Unique Identifiers
Mindat ID:
1148
Long-form identifier:
mindat:1:1:1148:4
GUID
(UUID V4):
(UUID V4):
f724da17-b3a4-49e6-a87c-43d38196d739
IMA Classification of Crawfordite
Approved
IMA Formula:
Na3Sr(PO4)(CO3)
First published:
1994
Classification of Crawfordite
5.BF.10
5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
F : With (Cl), SO4, PO4, TeO3
5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
F : With (Cl), SO4, PO4, TeO3
43.2.1.4
43 : COMPOUND PHOSPHATES, ETC.
2 : Anhydrous Normal Compound Phosphates, etc·
43 : COMPOUND PHOSPHATES, ETC.
2 : Anhydrous Normal Compound Phosphates, etc·
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Cfd | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Crawfordite
Pronunciation:
Play | Recorded by | Country |
---|---|---|
Jolyon Ralph | United Kingdom |
Physical Properties of Crawfordite
Sub-Vitreous
Transparency:
Transparent, Translucent
Colour:
Colourless
Streak:
White
Hardness:
3 on Mohs scale
Fracture:
Conchoidal
Density:
3.05 g/cm3 (Measured) 3.08 g/cm3 (Calculated)
Optical Data of Crawfordite
Type:
Biaxial (-)
RI values:
nα = 1.520 nβ = 1.564 nγ = 1.565
2V:
Measured: 20° (1), Calculated: 16°
Max Birefringence:
δ = 0.045
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
not discernible
Comments:
X ≈ γ, Y ≈ α, Z ≈ β
Chemistry of Crawfordite
Mindat Formula:
Na3Sr(CO3)(PO4)
Crystallography of Crawfordite
Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P21
Setting:
P21
Cell Parameters:
a = 9.18 Å, b = 6.7 Å, c = 5.27 Å
β = 89.98°
β = 89.98°
Ratio:
a:b:c = 1.37 : 1 : 0.787
Unit Cell V:
324.14 ų (Calculated from Unit Cell)
Z:
2
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0012486 | Crawfordite | Sokolova E V, Khomyakov A P (1992) Crystal structure of a new mineral Na3SePO4CO3 from bredleyite group Doklady Akademii Nauk SSSR 322 531-535 | 1992 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.708 Å | (100) |
2.648 Å | (90) |
2.172 Å | (100) |
1.891 Å | (90) |
1.415 Å | (70) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 4b: Highly evolved igneous rocks | >3.0 |
35 : Ultra-alkali and agpaitic igneous rocks | |
36 : Carbonatites, kimberlites, and related igneous rocks | |
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
50 : Coal and/or oil shale minerals | <0.36 |
Type Occurrence of Crawfordite
General Appearance of Type Material:
Irregular grains to 1 mm in diameter.
Place of Conservation of Type Material:
A. E. Fersman Mineralogical Museum, Moscow, Russia.
Associated Minerals at Type Locality:
Reference:
Khomjakov, A.P., Polezhaeva, L.I., Sokolova, E.V. (1994) Crawfordite Na3Sr(PO4)(CO3) - a new mineral from the bradleyite family. Zapiski Vserossijskogo Mineralogicheskogo Obshchestva: 123(3): 107-111.
Synonyms of Crawfordite
Other Language Names for Crawfordite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
5.BF.05 | Ferrotychite | Na6(Fe,Mn,Mg)2(CO3)4(SO4) |
5.BF.05 | Manganotychite | Na6Mn2(CO3)4(SO4) |
5.BF.05 | Northupite | Na3Mg(CO3)2Cl |
5.BF.05 | Tychite | Na6Mg2(CO3)4(SO4) |
5.BF.10 | Bonshtedtite | Na3Fe2+(CO3)(PO4) |
5.BF.10 | Bradleyite | Na3Mg(CO3)(PO4) |
5.BF.10 | Sidorenkite | Na3Mn2+(CO3)(PO4) |
5.BF.15 | Daqingshanite-(Ce) | (Sr,Ca,Ba)3(Ce,La)(CO3)3-x(PO4)(OH,F)2x |
5.BF.20 | Reederite-(Y) | (Na,Mn)15Y2(CO3)9(FSO3)Cl |
5.BF.25 | Mineevite-(Y) | Na25Ba(Y,Gd,Dy)2(CO3)11(HCO3)4(SO4)2F2Cl |
5.BF.30 | Brianyoungite | Zn3(CO3,SO4)(OH)4 |
5.BF.35 | Philolithite | Pb12Mn2+(Mg,Mn2+)2(Mn2+,Mg)4(CO3)4(SO4)O6(OH)12Cl4 |
5.BF.40 | Leadhillite | Pb4(CO3)2(SO4)(OH)2 |
5.BF.40 | Macphersonite | Pb4(CO3)2(SO4)(OH)2 |
5.BF.40 | Susannite | Pb4(CO3)2(SO4)(OH)2 |
5.BF.45 | Peatite-(Y) | Li4Na12Y12(PO4)12(CO3)4(F,OH)8 |
5.BF.50 | Ramikite-(Y) | Li4(Na,Ca)12Y6Zr6(PO4)12(CO3)4O4[(OH),F]4 |
Fluorescence of Crawfordite
Bright greenish yellow
Other Information
IR Spectrum:
Absorption bands at 1445, 1055, and 575 cm-1.
Notes:
Readily soluble in 10% HCl and in citric acid at room temperature
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Crawfordite
mindat.org URL:
https://www.mindat.org/min-1148.html
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References for Crawfordite
Reference List:
Khomjakov, A. P., Polezhaeva, L. I., Sokolova, E. V. (1994) Crawfordite Na3Sr(PO4)(CO3) - a new mineral from the bradleyite family. Zapiski Vserossijskogo Mineralogicheskogo Obshchestva, 123 (3) 107-111
Localities for Crawfordite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Russia (TL) | |
| Mandarino (1996) +1 other reference |
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Koashva Open Pit, Koashva Mt, Khibiny Massif, Murmansk Oblast, Russia