Kovdorskite Mineral Data

Kovdorskite Mineral Data +

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General Kovdorskite Information

Chemical Formula:

Mg5(PO4)2(CO3)(OH)2·4.5(H2O)

Composition:

Molecular Weight = 486.56 gm

Magnesium 24.98 % Mg 41.42 % MgO

Phosphorus 12.73 % P 29.17 % P₂O₅

Hydrogen 2.28 % H 20.36 % H₂O

Carbon 2.47 % C 9.05 % CO₂

Oxygen 57.54 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₅(PO₄)₂(CO₃)(OH)₂·4.5(H₂O)

Environment:

Found in magnetite-forsterite rocks.

IMA Status:

Approved IMA 1980

Locality:

Kovdor massif, Kola Pneinsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 20796

PDF 45-1380

Kovdorskite Image

Images:

Kovdorskite

Comments: Gemmy crystal of icy blue kovdorskite.
Location: Kheleznyi Mine, Kovdor, Kola Penisula, Russia. Scale: Crystal size 1 cm.
© John Veevaert

Kovdorskite Crystallography

Axial Ratios:

a:b:c =0.3674:1:0.8023

Cell Dimensions:

a = 4.74, b = 12.9, c = 10.35, Z = 2; beta = 102° V = 619.03 Den(Calc)= 2.61

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 7.96(1), 2.258(0.64), 2.821(0.59),

Crystal Structure:

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Ovchinnikov V E , Soloveva L P , Pudovkina Z V , Kapustin Yu L , Belov N V , Doklady Akademii Nauk SSSR , 255 (1980) p.351-354, The crystal structure of kovdorskite Mg2(PO4)(OH)*3(H2O)

Physical Properties of Kovdorskite

Cleavage:

None

Color:

Colorless, Greenish blue, Light pink, Pink.

Density:

2.6

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Hardness:

4 - Fluorite

Streak:

white

Optical Properties of Kovdorskite

Gladstone-Dale:

CI meas= 0.076 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.08 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2066,KPDmeas= 0.2074,KC= 0.2245

Optical Data:

Biaxial (-), a=1.527, b=1.542, g=1.549, bire=0.0220, 2V(Calc)=68, 2V(Meas)=80. Dispersion r > v very weak.

Calculated Properties of Kovdorskite

Electron Density:

r_electron=2.64 gm/cc
note: r_Kovdorskite=2.60 gm/cc.

Fermion Index

Fermion Index = 0.02552
Boson Index = 0.97448

Photoelectric:

PE_Kovdorskite= 1.24 barns/electron
U=PE_Kovdorskite x r_electron= 3.28 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kovdorskite is Not Radioactive

Kovdorskite Classification

Dana Class:

43.5.8.1 (43)Compound Phosphates, etc.

(43.5)(Hydrated Compound Anions With Hydroxyl or Halogen)

(43.5.8)Dana Group

43.5.8.1 Kovdorskite Mg5(PO4)2(CO3)(OH)2·4.5(H2O) P 2₁/c 2/m

Strunz Class:

VII/D.36-10 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.36 - Kovdorskite - Gatumbaite series

VII/D.36-10 Kovdorskite Mg5(PO4)2(CO3)(OH)2·4.5(H2O) P 2₁/c 2/m

VII/D.36-20 Camgasite CaMg(AsO4)(OH)·5(H2O) P 2₁/m 2/m

VII/D.36-30 Isoclasite Ca2(PO4)(OH)·2(H2O)(?) Mono

VII/D.36-40 Gatumbaite CaAl2(PO4)2(OH)2·(H2O) P12/m,P 2,Pm Mono

Other Kovdorskite Information

References:

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

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

Kovdorskite

Mg5(PO4)2(CO3)(OH)2·4.5(H2O)
Dana No: 43.5.8.1 Strunz No: VII/D.36-10
Locality:

Notes: