Rimkorolgite Mineral Data

Rimkorolgite Mineral Data +

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General Rimkorolgite Information

Chemical Formula:

Mg5Ba(PO4)4·8(H2O)

Composition:

Molecular Weight = 782.86 gm

Barium 17.54 % Ba 19.59 % BaO

Magnesium 15.52 % Mg 25.74 % MgO

Phosphorus 15.83 % P 36.26 % P₂O₅

Hydrogen 2.06 % H 18.41 % H₂O

Oxygen 49.05 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₅Ba(PO₄)₄·8(H₂O)

Environment:

In cavities in dolomitic carbonatites. Structure closely related to bakhchisaraitsevite.

IMA Status:

Approved IMA 1995 (Dana # Added)

Locality:

Kovdor iron deposit, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

For Olga M. Rimskaya-Konsakova (1914-1987), Russian mineralogist from St. Petersbug University.

Synonym:

IMA1990-032

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Rimkorolgite Crystallography

Axial Ratios:

a:b:c =0.6496:1:1.4273

Cell Dimensions:

a = 8.3354, b = 12.8304, c = 18.313, Z = 4; beta = 90.2° V = 1,958.50 Den(Calc)= 2.65

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): 10.51(1), 3.081(0.78), 2.969(0.44),

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Crystal Structure:

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Krivovichev S V , Britvin S N , Burns P C , Yakovenchuk V N , European Journal of Mineralogy , 14 (2002) p.397-402, Crystal structure of rimkorolgite, Ba[Mg5(H2O)7(PO4)4](H2O), and its comparison, with bakhchisaraitsevite

Physical Properties of Rimkorolgite

Cleavage:

[001] Perfect

Color:

Yellowish brown, Pink.

Density:

2.67

Diaphaniety:

Transparent to translucent

Fracture:

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

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Hardness:

3 - Calcite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Silky

Streak:

white

Optical Properties of Rimkorolgite

Gladstone-Dale:

CI meas= -0.01 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2091,KPDmeas= 0.2075,KC= 0.2055

Optical Data:

Biaxial (+), a=1.552, b=1.552, g=1.558, bire=0.0060, 2V(Calc)=0, 2V(Meas)=23.

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Rimkorolgite

Electron Density:

r_electron=2.62 gm/cc
note: r_Rimkorolgite=2.67 gm/cc.

Fermion Index

Fermion Index = 0.04702
Boson Index = 0.95298

Photoelectric:

PE_Rimkorolgite= 72.85 barns/electron
U=PE_Rimkorolgite x r_electron= 190.82 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Rimkorolgite is Not Radioactive

Rimkorolgite Classification

Dana Class:

40.5.15.1 (40)Hydrated Phosphates, etc

(40.5)with miscellaneous formulae

(40.5.15)Dana Group

40.5.15.1 Rimkorolgite ! Mg5Ba(PO4)4·8(H2O) P 2₁/c 2/m

Strunz Class:

VII/C.20-10 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.20 - Rimkorolgite series

VII/C.20-05 Bakhchisaraitsevite! Na2Mg5(PO4)4·7(H2O) P 2₁/c 2/m

VII/C.20-10 Rimkorolgite Mg5Ba(PO4)4·8(H2O) P 2₁/c 2/m

Other Rimkorolgite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min., v 81, v 87, p 1735) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Rimkorolgite :
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 12 -École des Mines de Paris

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

Rimkorolgite

Mg5Ba(PO4)4·8(H2O)
Dana No: 40.5.15.1 Strunz No: VII/C.20-10
Locality:

Notes: