Log In
Crawfordite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
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.
Type Locality:
Found in hyperagpaitic pegmatites
Unique Identifiers
Mindat ID:
1148
Long-form identifier:
mindat:1:1:1148:4
IMA Classification of Crawfordite
Approved
IMA Formula:
Na3Sr(PO4)(CO3)
Approval year:
1993
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 for Standard |
|---|---|---|
| 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 = 1.52 nβ = 1.564 nγ = 1.565
2V:
Measured: 20° (1), Calculated: 16°
Max. Birefringence:
δ = 0.045
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
not discernible
Comments:
X ≈ γ, Y ≈ α, Z ≈ β
Chemistry of Crawfordite
Mindat Formula:
Na3Sr(CO3)(PO4)
Element Weights:
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
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
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:
Synonyms of Crawfordite
Other Language Names for Crawfordite
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 5.BF.05 | Northupite | Na3Mg(CO3)2Cl |
| 5.BF.05 | Manganotychite | Na6Mn2(CO3)4(SO4) |
| 5.BF.05 | Tychite | Na6Mg2(CO3)4(SO4) |
| 5.BF.05 | Ferrotychite | Na6(Fe,Mn,Mg)2(CO3)4(SO4) |
| 5.BF.10 | Sidorenkite | Na3Mn2+(CO3)(PO4) |
| 5.BF.10 | Bonshtedtite | Na3Fe2+(CO3)(PO4) |
| 5.BF.10 | Bradleyite | Na3Mg(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
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
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
Showing 1 localities.
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Russia (TL) | |
| Mandarino (1996) +1 other reference |
Quick NavTopAbout CrawforditeUnique IdentifiersIMA Classification Classification Mineral SymbolsPronunciation Physical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Koashva Open Pit, Koashva Mt, Murmansk Oblast, Russia