Crawfordite Mineral Data

Crawfordite Mineral Data

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General Crawfordite Information

Chemical Formula:

Na3Sr(PO4)(CO3)

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

Empirical Formula:

Na₃Sr(PO₄)(CO₃)

Environment:

In hyperagpatic pegmatites.

IMA Status:

Approved IMA 1994

Locality:

Mount Koashava, Khibini alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

For the Scottish doctor and chemist, Dr. A. Crawford (1748-1795).

Synonym:

ICSD 39559

IMA1993-030

PDF 47-1853

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Crawfordite Crystallography

Axial Ratios:

a:b:c =1.3684:1:0.787

Cell Dimensions:

a = 9.178, b = 6.707, c = 5.279, Z = 2; beta = 89.163° V = 324.92 Den(Calc)= 3.18

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 2₁

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.172(1), 2.708(1), 2.648(0.9),

Physical Properties of Crawfordite

Cleavage:

None

Color:

Colorless, White.

Density:

3.05 - 3.08, Average = 3.06

Diaphaniety:

Transparent to translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

3 - Calcite

Luminescence:

Fluorescent, Short UV=bright greenish yellow.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Crawfordite

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

Optical Data:

Biaxial (-), a=1.52, b=1.564, g=1.565, bire=0.0450, 2V(Calc)=16, 2V(Meas)=20. Dispersion not discernible.

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Crawfordite

Electron Density:

r_electron=2.91 gm/cc
note: r_Crawfordite=3.07 gm/cc.

Fermion Index

Fermion Index = 0.02028
Boson Index = 0.97972

Photoelectric:

PE_Crawfordite= 32.16 barns/electron
U=PE_Crawfordite x r_electron= 93.64 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Crawfordite is Not Radioactive

Crawfordite Classification

Dana Class:

43.2.1.4 (43)Compound Phosphates, etc.

(43.2)(Anhydrous Normal Compound Anions)

(43.2.1)Dana Group

43.2.1.1 Bradleyite Na3Mg(PO4)(CO3) P 2₁/m 2/m

43.2.1.2 Sidorenkite Na3Mn(PO4)(CO3) P 2₁/m 2/m

43.2.1.3 Bonshtedtite Na3Fe(PO4)(CO3) P 2₁/m 2/m

43.2.1.4 Crawfordite Na3Sr(PO4)(CO3) P 2₁ 2

Strunz Class:

V/C.04-40 V - Nitrates, Carbonates and Borates

V/C - Waterfree carbonates with unfamiliar anions

V/C.04 - Bradleyite - Crawfordite series

V/C.04-10 Bradleyite Na3Mg(PO4)(CO3) P 2₁/m 2/m

V/C.04-20 Sidorenkite Na3Mn(PO4)(CO3) P 2₁/m 2/m

V/C.04-30 Bonshtedtite Na3Fe(PO4)(CO3) P 2₁/m 2/m

V/C.04-40 Crawfordite Na3Sr(PO4)(CO3) P 2₁ 2

Other Crawfordite Information

References:

NAME( MinRec) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Crawfordite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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

Crawfordite

Na3Sr(PO4)(CO3)
Dana No: 43.2.1.4 Strunz No: V/C.04-40
Locality:

Notes: