Crawfordite Mineral Data

Crawfordite Mineral Data
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General Crawfordite Information

Help on Chemical Formula: Chemical Formula: Na3Sr(PO4)(CO3)
Help on Composition: Composition: Molecular Weight = 311.57 gm
   Sodium      22.14 %  Na   29.84 % Na2O
   Strontium   28.12 %  Sr   33.26 % SrO
   Phosphorus   9.94 %  P    22.78 % P2O5
   Carbon       3.85 %  C    14.13 % CO2
   Oxygen      35.95 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na3Sr(PO4)(CO3)
Help on Environment: Environment: In hyperagpatic pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1994
Help on Locality: Locality: Mount Koashava, Khibini alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For the Scottish doctor and chemist, Dr. A. Crawford (1748-1795).
Help on Synonym: Synonym: ICSD 39559
  IMA1993-030
  PDF 47-1853
 

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Crawfordite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1.3684:1:0.787
Help on Cell Dimensions: Cell Dimensions: a = 9.178, b = 6.707, c = 5.279, Z = 2; beta = 89.163° V = 324.92 Den(Calc)= 3.18
Help on Crystal System: Crystal System: Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.172(1), 2.708(1), 2.648(0.9),
Click Here for Large Crawfordite Structure Window Crystal Structure:

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Sokolova E V , Khomyakov A P , Doklady Akademii Nauk SSSR , 322 (1992) p.531-535, Crystal structure of a new mineral Na3SePO4CO3 from bredleyite group

 

Physical Properties of Crawfordite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, White.
Help on Density: Density: 3.05 - 3.08, Average = 3.06
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 3 - Calcite
Help on Luminescence: Luminescence: Fluorescent, Short UV=bright greenish yellow.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Crawfordite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1729,KPDmeas= 0.1793,KC= 0.1764
Ncalc = 1.54 - 1.56
Help on Optical Data: Optical Data: Biaxial (-), a=1.52, b=1.564, g=1.565, bire=0.0450, 2V(Calc)=16, 2V(Meas)=20. Dispersion not discernible.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Crawfordite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.91 gm/cc
note: Specific Gravity of Crawfordite =3.07 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PECrawfordite = 32.16 barns/electron
U=PECrawfordite x rElectron Density= 93.64 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Crawfordite is Not Radioactive
 

Crawfordite Classification
Help on Dana Class: Dana Class: 43.02.01.04 (43)Compound Phosphates, etc.
  (43.02)(Anhydrous Normal Compound Anions)
  (43.02.01)Bradleyite Group
 
43.02.01.01 Bradleyite Na3Mg(PO4)(CO3) P 21/m 2/m
 
43.02.01.02 Sidorenkite Na3Mn(PO4)(CO3) P 21/m 2/m
 
43.02.01.03 Bonshtedtite Na3Fe(PO4)(CO3) P 21/m 2/m
 
43.02.01.04 Crawfordite Na3Sr(PO4)(CO3) P 21 2
Help on Strunz Class: Strunz Class: 05.BF.10 05 - CARBONATES (NITRATES)
  05.B - Carbonates with additional anions, without H2O
  05.BF -With (Cl), SO4, PO4, TeO3
 
05.BF.10 Bonshtedtite Na3Fe(PO4)(CO3) P 21/m 2/m
 
05.BF.10 Crawfordite Na3Sr(PO4)(CO3) P 21 2
 
05.BF.10 Bradleyite Na3Mg(PO4)(CO3) P 21/m 2/m
 
05.BF.10 Sidorenkite Na3Mn(PO4)(CO3) P 21/m 2/m
 

Other Crawfordite Information
Help on References: References: NAME( MinRec) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(MinRec)
Help on See Also: See Also: Links to other databases for Crawfordite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Crawfordite Specimen Label here :

Crawfordite

Na3Sr(PO4)(CO3)
Dana No: 43.02.01.04 Strunz No: 05.BF.10
Locality:

 

Notes: