Lokkaite-(Y) Mineral Data

Lokkaite-(Y) Mineral Data +

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General Lokkaite-(Y) Information

Chemical Formula:

CaY4(CO3)7·9(H2O)

Composition:

Molecular Weight = 977.90 gm

Calcium 4.10 % Ca 5.73 % CaO

Yttrium 36.37 % Y 46.18 % Y₂O₃

Hydrogen 1.86 % H 16.58 % H₂O

Carbon 8.60 % C 31.50 % CO₂

Oxygen 49.08 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaY₄(CO₃)₇·9(H₂O)

Environment:

Alteration product of rare-earth minerals.

IMA Status:

Approved IMA 1970

Locality:

Pyoronmaa pegmatite, Kangasala, Finland. Link to MinDat.org Location Data.

Name Origin:

Named after Lauri Lokka (1875-1966), mineralogist and chief chemist, Geological Survey of Finland.

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Lokkaite-(Y) Crystallography

Axial Ratios:

a:b:c =6.4465:1:1.517

Cell Dimensions:

a = 39.35, b = 6.104, c = 9.26, Z = 4; V = 2,224.18 Den(Calc)= 2.92

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Pb2m

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

By Intensity(I/I_o): 3.808(1), 4.594(0.75), 3.902(0.6),

Physical Properties of Lokkaite-(Y)

Color:

Snow white.

Density:

2.92

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Lokkaite-(Y)

Gladstone-Dale:

CI meas= 0.047 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.047 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2033,KPDmeas= 0.2033,KC= 0.2134

Optical Data:

Biaxial (?), a=1.569, b=1.592, g=1.62, bire=0.0510

Calculated Properties of Lokkaite-(Y)

Electron Density:

r_electron=2.84 gm/cc
note: r_Lokkaite-(Y)=2.92 gm/cc.

Fermion Index

Fermion Index = 0.00123
Boson Index = 0.99877

Photoelectric:

PE_Lokkaite-(Y)= 44.53 barns/electron
U=PE_Lokkaite-(Y) x r_electron= 126.58 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Lokkaite-(Y) is Not Radioactive

Lokkaite-(Y) Classification

Dana Class:

15.4.4.1 (15)Hydrated Carbonates

(15.4)Dana Type

(15.4.4)Dana Group

15.4.4.1 Lokkaite-(Y) CaY4(CO3)7·9(H2O) Pb2m mm2

Strunz Class:

V/D.03-60 V - Nitrates, Carbonates and Borates

V/D - Water-bearing carbonates without unfamiliar anions

V/D.03 - Calkinsite-(Ce) - Lokkaite-(Y) series

V/D.03-02 Adamsite-(Y)! NaY(CO3)2·6(H2O) P1 1

V/D.03-05 Shomiokite-(Y) Na3Y(CO3)3·3(H2O) Pbn21 mm2

V/D.03-10 Calkinsite-(Ce) (Ce,La)2(CO3)3·4(H2O) P 2₁221 2 2 2

V/D.03-20 Lanthanite-(La) (La,Ce)2(CO3)3·8(H2O) Pbnb 2/m 2/m 2/m

V/D.03-30 Lanthanite-(Ce) (Ce,La)2(CO3)3·8(H2O) Pbnb 2/m 2/m 2/m

V/D.03-40 Lanthanite-(Nd) (Nd,La)2(CO3)3·8(H2O) Pbnb 2/m 2/m 2/m

V/D.03-45 Tengerite-(Y) Y2(CO3)3·2-3(H2O) Pb21m mm2

V/D.03-50 Kimuraite-(Y) CaY2(CO3)4·6(H2O) Imm2,I mmm,I 222,I 2₁2₁2₁ Ortho

V/D.03-55 Galgenbergite-(Ce)! Ca(REE)2(CO3)4·(H2O) P1 1

V/D.03-60 Lokkaite-(Y) CaY4(CO3)7·9(H2O) Pb2m mm2

Other Lokkaite-(Y) Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Lokkaite-(Y) :
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

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

Lokkaite-(Y)

CaY4(CO3)7·9(H2O)
Dana No: 15.4.4.1 Strunz No: V/D.03-60
Locality:

Notes: