Lokkaite-(Y) Mineral Data

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.

Name Pronunciation:

Lokkaite-(Y)

Lokkaite-(Y) Image

Images:

Lokkaite-(Y)

Comments: White coating of lokkaite-(Y) on matrix with hellandite and possible kainosite.
Location: Evans-Lou Quarry, Quebec, Canada. Scale: Specimen Size 3 x 5 cm.
© Diederik Visser

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 - Pyramidal H-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
Ncalc = 1.62

Optical Data:

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

Calculated Properties of Lokkaite-(Y)

Electron Density:

Bulk Density (Electron Density)=2.84 gm/cc
note: Specific Gravity of Lokkaite-(Y) =2.92 gm/cc.

Fermion Index:

Fermion Index = 0.0012394529
Boson Index = 0.9987605471

Photoelectric:

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

Radioactivity:

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

Lokkaite-(Y) Classification

Dana Class:

15.04.04.01 (15)Hydrated Carbonates

(15.04)Dana Type

(15.04.04)Dana Group

15.04.04.01 Lokkaite-(Y) CaY4(CO3)7•9(H2O) Pb2m mm2

Strunz Class:

05.CC.15 05 - CARBONATES (NITRATES)

05.C - Carbonates without Additional Anions, with H2O

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

05.CC.15 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 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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

Lokkaite-(Y)

CaY4(CO3)7•9(H2O)
Dana No: 15.04.04.01 Strunz No: 05.CC.15
Locality:

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