Bastnasite-(Y) Mineral Data

General Bastnasite-(Y) Information

Chemical Formula:

Y(CO3)F

Composition:

Molecular Weight = 167.91 gm

Yttrium 52.95 % Y 67.24 % Y₂O₃

Carbon 7.15 % C 26.21 % CO₂

Oxygen 28.59 % O

Fluorine 11.31 % F 11.31 % F

- % F -4.76 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Y(CO₃)F

IMA Status:

Approved IMA 1970

Locality:

Kazakhstan. Link to MinDat.org Location Data.

Name Origin:

Named as the Y end member and after the Bastnas Mine, Riddarhyttan, Vastmanland, Sweden.

Name Pronunciation:

Bastnasite-(Y) + Pronunciation

Synonym:

Hamartite

Bastnasite-(Y) Crystallography

Axial Ratios:

a:c = 1:1.44292

Cell Dimensions:

a = 6.57, c = 9.48, Z = 6; V = 354.38 Den(Calc)= 4.72

Crystal System:

Hexagonal - Ditrigonal Dipyramidal H-M Symbol (6 m2) Space Group: P 62c

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

By Intensity(I/I_o): 1.948(1), 2.78(1), 3.43(0.75),

Physical Properties of Bastnasite-(Y)

Cleavage:

{1011} Imperfect, {0001} Indistinct

Color:

Yellow, Reddish brown.

Density:

4.9 - 5, Average = 4.95

Diaphaneity:

Transparent to Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

4-4.5 - Between Fluorite and Apatite

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Bastnasite-(Y)

Gladstone-Dale:

CI meas= 0.114 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.07 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1626,KPDmeas= 0.1551,KC= 0.1749
Ncalc = 1.83 - 1.87

Optical Data:

Uniaxial (+), w=1.717, e=1.818, bire=0.1010.

Calculated Properties of Bastnasite-(Y)

Electron Density:

Bulk Density (Electron Density)=4.39 gm/cc
note: Specific Gravity of Bastnasite-(Y) =4.72 gm/cc.

Fermion Index:

Fermion Index = 0.0009240483
Boson Index = 0.9990759517

Photoelectric:

PE_{Bastnasite-(Y)}= 67.02 barns/electron
U=PE_{Bastnasite-(Y)} x rElectron Density= 293.90 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bastnasite-(Y) is Not Radioactive

Bastnasite-(Y) Classification

Dana Class:

16a.01.01.03 (16a)Carbonates - Hydroxyl or Halogen

(16a.01)in the Bastnasite/Shynchysite/Parasite Groups

(16a.01.01)Bastnasite Subgroup

16a.01.01.01 Bastnasite-(Ce) Ce(CO3)F P 62c 6 m2

16a.01.01.02 Bastnasite-(La) La(CO3)F P 62c 6 m2

16a.01.01.03 Bastnasite-(Y) Y(CO3)F P 62c 6 m2

Strunz Class:

05.BD.20a 05 - CARBONATES (NITRATES)

05.B - Carbonates with additional anions, without H2O

05.BD -With rare-earth elements (REE)

05.BD.20a Bastnasite-(Ce) Ce(CO3)F P 62c 6 m2

05.BD.20a Bastnasite-(La) La(CO3)F P 62c 6 m2

05.BD.20a Bastnasite-(Y) Y(CO3)F P 62c 6 m2

05.BD.20a Hydroxylbastnasite-(Ce) Ce(CO3)(OH) P 62c 6 m2

05.BD.20a Hydroxylbastnasite-(La) La(CO3)(OH) C 222₁ 2 2 2

05.BD.20a Hydroxylbastnasite-(Nd) Nd(CO3)(OH) P 62c 6 m2

05.BD.20a Thorbastnasite Th(Ca,Ce)(CO3)2F2•3(H2O) P 62c 6 m2

Other Bastnasite-(Y) Information

References:

NAME( Ford32) PHYS. PROP.(Dana8) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Bastnasite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Print or Cut-and-Paste your Bastnasite-(Y) Specimen Label here :

Bastnasite-(Y)

Y(CO3)F
Dana No: 16a.01.01.03 Strunz No: 05.BD.20a
Locality:

Notes:

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