Rimkorolgite Mineral Data

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.

Name Pronunciation:

Rimkorolgite + Pronunciation

Synonym:

IMA1990-032

Rimkorolgite Image

Images:

Rimkorolgite

Comments: Pinkish flesh-colored crystals of rimkorolgite in matrix.
Location: Kovdor Massif, Kola Peninsula, Russia. Scale: Specimen Size 25x17x8 mm.
© Sergey Vasiliev / Systematic Mineralogy

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),

Forms:

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Forms: ( 0 1 0) ( 1 0 1) ( 0 0 1)

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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

Diaphaneity:

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
Ncalc = 1.54 - 1.55

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:

Bulk Density (Electron Density)=2.62 gm/cc
note: Specific Gravity of Rimkorolgite =2.67 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Rimkorolgite= 72.85 barns/electron
U=PE_Rimkorolgite x rElectron Density= 190.82 barns/cc.

Radioactivity:

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

Rimkorolgite Classification

Dana Class:

40.05.15.01 (40)Hydrated Phosphates, etc

(40.05)with miscellaneous formulae

(40.05.15)Dana Group

40.05.15.01 Rimkorolgite! Mg5Ba(PO4)4•8(H2O) P 2₁/c 2/m

40.05.15.02 IMA2008-048! Zn6(PO4)4•7H2O P1 1

Strunz Class:

08.CH.45 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CH -With large and medium-sized cations, RO4:H2O < 1:1

08.CH.45 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Rimkorolgite

Mg5Ba(PO4)4•8(H2O)
Dana No: 40.05.15.01 Strunz No: 08.CH.45
Locality:

Notes: