Lunokite Mineral Data

General Lunokite Information

Chemical Formula:

(Mn,Ca)(Mg,Fe++,Mn)Al(PO4)2(OH)•4(H2O)

Composition:

Molecular Weight = 396.13 gm

Calcium 2.02 % Ca 2.83 % CaO

Magnesium 2.45 % Mg 4.07 % MgO

Manganese 15.26 % Mn 19.70 % MnO

Aluminum 7.49 % Al 14.16 % Al₂O₃

Iron 2.82 % Fe 3.63 % FeO

Phosphorus 15.64 % P 35.83 % P₂O₅

Hydrogen 2.21 % H 19.78 % H₂O

Oxygen 52.10 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_0.8Ca_0.2Mg_0.4Fe²⁺_0.2Mn²⁺_0.3Al_1.1(PO₄)₂(OH)_1.1ï¿½3.8(H₂O)

Environment:

In fractures and on crusts of mitridatite in granite pegmatites.

IMA Status:

Approved IMA 1983

Locality:

On Mt. Vasin-Myl'k, Voron'i massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the Lun'ok River, nearby Mt. Vasin-Myl'k, Russia.

Synonym:

Lun'okite

Lunokite Crystallography

Axial Ratios:

a:b:c =0.799:1:0.3719

Cell Dimensions:

a = 14.95, b = 18.71, c = 6.96, Z = 8; V = 1,946.81 Den(Calc)= 2.70

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P bca

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

By Intensity(I/I_o): 2.809(1), 9.39(0.9), 2.92(0.7),

Physical Properties of Lunokite

Cleavage:

{010} Perfect, {001} Imperfect

Color:

Colorless, White.

Density:

2.66

Diaphaneity:

Transparent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

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

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Lunokite

Gladstone-Dale:

CI meas= -0.032 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2256,KPDmeas= 0.2289,KC= 0.2219
Ncalc = 1.59 - 1.6

Optical Data:

Biaxial (+), a=1.603, b=1.608, g=1.616, bire=0.0130, 2V(Calc)=78, 2V(Meas)=70. Dispersion r > v.

Calculated Properties of Lunokite

Electron Density:

Bulk Density (Electron Density)=2.70 gm/cc
note: Specific Gravity of Lunokite =2.70 gm/cc.

Fermion Index:

Fermion Index = 0.003332756
Boson Index = 0.996667244

Photoelectric:

PE_Lunokite= 5.92 barns/electron
U=PE_Lunokite x rElectron Density= 15.96 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lunokite is Not Radioactive

Lunokite Classification

Dana Class:

42.11.01.04 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.11)where (AB)4 (XO4)3 Zq ï¿½ x(H2O)

(42.11.01)Overite Group

42.11.01.01 Overite CaMgAl(PO4)2(OH)•4(H2O) Pcca 2/m 2/m 2/m

42.11.01.02 Segelerite CaMgFe(PO4)2(OH)•4(H2O) Pcca 2/m 2/m 2/m

42.11.01.03 Manganosegelerite (Mn,Ca)(Mn,Fe,Mg)Fe(PO4)2(OH)•4(H2O) P bca 2/m 2/m 2/m

42.11.01.04 Lunokite (Mn,Ca)(Mg,Fe,Mn)Al(PO4)2(OH)•4(H2O) P bca 2/m 2/m 2/m

42.11.01.05 Wilhelmvierlingite CaMnFe(PO4)2(OH)•2(H2O) P bca 2/m 2/m 2/m

42.11.01.06 Kaluginite* (Mn,Ca)MgFe(PO4)2(OH)•4(H2O) C cca 2/m 2/m 2/m

42.11.01.07 Juonniite! CaMgSc(PO4)2(OH)•4(H2O) P bca 2/m 2/m 2/m

Strunz Class:

08.DH.30 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DH -With large and medium-sized cations, (OH, etc.):RO4 < 1:1

08.DH.30 Arseniosiderite Ca2Fe3(AsO4)3O2•3(H2O) A2/a 2/m

08.DH.30 Pararobertsite Ca2Mn3(PO4)3O2•3(H2O) P 2₁/c 2/m

08.DH.30 Kolfanite Ca2Fe3O2(AsO4)3•2(H2O) A2/a 2/m

08.DH.30 Lunokite (Mn,Ca)(Mg,Fe,Mn)Al(PO4)2(OH)•4(H2O) P bca 2/m 2/m 2/m

08.DH.30 Robertsite Ca6Mn9(PO4)9O6(H2O)6•3(H2O) A2/a 2/m

08.DH.30 Mitridatite Ca2Fe3(PO4)3O2•3(H2O) A2/a 2/m

08.DH.30 Sailaufite! Ca2Mn3O2(AsO4)2(CO3)•3(H2O) Cm m

Other Lunokite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(AntBidBlaNic4) OPTIC PROP.(AntBidBlaNic4)

See Also:

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

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

Lunokite

(Mn,Ca)(Mg,Fe++,Mn)Al(PO4)2(OH)•4(H2O)
Dana No: 42.11.01.04 Strunz No: 08.DH.30
Locality:

Notes:

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