Mineralogy Database

Lokkaite-(Y) Mineral Data

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General Lokkaite-(Y) Information

Help on Chemical  Formula: Chemical Formula: CaY4(CO3)7•9(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: CaY4(CO3)7•9(H2O)
Help on Environment: Environment: Alteration product of rare-earth minerals.
Help on IMA Status: IMA Status: Approved IMA 1970
Help on Locality: Locality: Pyoronmaa pegmatite, Kangasala, Finland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Lauri Lokka (1875-1966), mineralogist and chief chemist, Geological Survey of Finland.
Help on Name Pronunciation: Name Pronunciation: Lokkaite-(Y) Say LOKKAITE-(Y)

Lokkaite-(Y) Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =6.4465:1:1.517
Help on Cell Dimensions: Cell Dimensions: a = 39.35, b = 6.104, c = 9.26, Z = 4; V = 2,224.18 Den(Calc)= 2.92
Help on Crystal System: Crystal System: Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: Pb2m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.808(1), 4.594(0.75), 3.902(0.6),

Physical Properties of Lokkaite-(Y)

Help on Color: Color: Snow white.
Help on Density: Density: 2.92
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Lokkaite-(Y)

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (?), a=1.569, b=1.592, g=1.62, bire=0.0510

Calculated Properties of Lokkaite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.84 gm/cc
note: Specific Gravity of Lokkaite-(Y) =2.92 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0012394529
Boson Index = 0.9987605471
Help on Photoelectric: Photoelectric: PELokkaite-(Y) = 44.53 barns/electron
U=PELokkaite-(Y) x rElectron Density= 126.58 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lokkaite-(Y) is Not Radioactive

Lokkaite-(Y) Classification

Help on  Dana Class: Dana Class: (15)Hydrated Carbonates
  (15.04)Dana Type
  (15.04.04)Dana Group Lokkaite-(Y) CaY4(CO3)7•9(H2O) Pb2m mm2
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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Dana No: Strunz No: 05.CC.15





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