Rimkorolgite
A valid IMA mineral species
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About Rimkorolgite
Olga M. Rimskaya-Korsakova
Formula:
(Mg,Mn)5(Ba,Sr,Ca)(PO4)4 · 8H2O
Colour:
Yellow-brown, light pink, flesh-red to reddish brown
Lustre:
Vitreous, Silky
Hardness:
3
Specific Gravity:
2.67
Crystal System:
Orthorhombic
Name:
Named in honor of Rimskaya-Korsakova, Olga Mikhailovna (Oльга Михайловна Римская-Корсакова) (29 April 1914, St. Petersburg - 18 October 1987), a Russian mineralogist from St. Petersburg University. She was an expert on the Kovdor area, doing 25 years of field work there.
Dimorph of:
Structurally related to bakhchisaraitsevite and liversidgeite.
15-20% of the grains bear intergrowths with hexagonal polymorph, UM1995-23-PO:BaHMgSr.
15-20% of the grains bear intergrowths with hexagonal polymorph, UM1995-23-PO:BaHMgSr.
Unique Identifiers
Mindat ID:
3420
Long-form identifier:
mindat:1:1:3420:9
IMA Classification of Rimkorolgite
Approved
IMA Formula:
BaMg5(PO4)4·8H2O
Approval year:
1990
First published:
1995
Classification of Rimkorolgite
8.CH.45
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
H : With large and medium-sized cations, RO4:H2O < 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
H : With large and medium-sized cations, RO4:H2O < 1:1
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Rolg | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Rimkorolgite
Vitreous, Silky
Transparency:
Transparent, Translucent
Comment:
silky in aggregates.
Colour:
Yellow-brown, light pink, flesh-red to reddish brown
Streak:
White
Hardness:
3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
Perfect {001}
Perfect {001}
Density:
2.67(2) g/cm3 (Measured) 2.62 g/cm3 (Calculated)
Optical Data of Rimkorolgite
Type:
Biaxial (+)
RI values:
nα = 1.552(2) nβ = 1.552(2) nγ = 1.558(2)
2V:
Measured: 23° (5)
Max. Birefringence:
δ = 0.006
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Low (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
weak to distinct
Chemistry of Rimkorolgite
Mindat Formula:
(Mg,Mn)5(Ba,Sr,Ca)(PO4)4 · 8H2O
Element Weights:
Crystallography of Rimkorolgite
Crystal System:
Orthorhombic
Cell Parameters:
a = 12.829(4) Å, b = 8.335(2) Å, c = 18.312(3) Å
Ratio:
a:b:c = 1.539 : 1 : 2.197
Unit Cell V:
1,958.10 ų (Calculated from Unit Cell)
Z:
4
Morphology:
short prismatic, fibrous, and in crusts.
Comment:
Point Group: 2/m 2/m 2/m or mm2.; Space Group: P cmm, P cm21, or P c2m.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Big Balls | Small Balls | Just Balls | Spacefill
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Display Options
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View
CIF File Best | x | y | z | a | b | c
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Labels
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0006928 | Rimkorolgite | Krivovichev S V, Britvin S N, Burns P C, Yakovenchuk V N (2002) Crystal structure of rimkorolgite, Ba[Mg5(H2O)7(PO4)4](H2O), and its comparison with bakhchisaraitsevite European Journal of Mineralogy 14 397-402 | 2002 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 10.51 Å | (100) |
| 3.081 Å | (78) |
| 2.969 Å | (44) |
| 3.054 Å | (41) |
| 3.520 Å | (34) |
| 2.839 Å | (34) |
| 3.874 Å | (32) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 36 : Carbonatites, kimberlites, and related igneous rocks | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] |
Type Occurrence of Rimkorolgite
Place of Conservation of Type Material:
Mineralogical Museum of the St. Petersburg Mining Institute.
Mineralogical Museum of the Mineralogical Chair of St. Petersburg University, Russia.
Mineralogical Museum of the Mineralogical Chair of St. Petersburg University, Russia.
Associated Minerals at Type Locality:
Synonyms of Rimkorolgite
Other Language Names for Rimkorolgite
Dutch:Rimkorolgiet
German:Rimkorolgit
Russian:Римкорольгит
Simplified Chinese:磷钡镁石
Spanish:Rimkorolgita
Traditional Chinese:磷鋇鎂石
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 8.CH.05 | Natrowalentaite | [Fe3+0.5Na0.5(H2O)6][NaAs3+2(Fe3+2.33W6+0.67)(PO4)2O7] |
| 8.CH.05 | Walentaite | [Mn2+(H2O)6][◻As3+3Fe3+3(PO4)2O7] |
| 8.CH.05 | Halilsarpite | [Mg(H2O)6][CaAs3+2(Fe3+2.67Mo6+0.33)(AsO4)2O7] |
| 8.CH.10 | Anapaite | Ca2Fe2+(PO4)2 · 4H2O |
| 8.CH.15 | Picropharmacolite | Ca4Mg(AsO4)2(HAsO4)2 · 11H2O |
| 8.CH.20 | Dittmarite | (NH4)Mg(PO4) · H2O |
| 8.CH.20 | Niahite | (NH4)Mn2+(PO4) · H2O |
| 8.CH.25 | Taranakite | K3Al5(PO3OH)6(PO4)2 · 18H2O |
| 8.CH.25 | Francoanellite | K3Al5(PO3OH)6(PO4)2 · 12H2O |
| 8.CH.25 | Macivorite | (NH4)3Al5(PO3OH)6(PO4)2 · 18H2O |
| 8.CH.30 | Schertelite | (NH4)2MgH2(PO4)2 · 4H2O |
| 8.CH.35 | Hannayite | (NH4)2Mg3H4(PO4)4 · 8H2O |
| 8.CH.40 | Hazenite | KNaMg2(PO4)2 · 14H2O |
| 8.CH.40 | Struvite-(K) | KMg(PO4) · 6H2O |
| 8.CH.40 | Struvite | (NH4)Mg(PO4) · 6H2O |
| 8.CH.50 | Bakhchisaraitsevite | Na2Mg5(PO4)4 · 7H2O |
| 8.CH.55 | Smolyaninovite | Co3Fe3+2(AsO4)4 · 11H2O |
| 8.CH.55 | Fahleite | CaZn5Fe3+2(AsO4)6 · 14H2O |
| 8.CH.60 | Barahonaite-(Fe) | (Ca,Cu,Na,Fe3+,Al)12Fe3+2(AsO4)8(OH,Cl)x · nH2O |
| 8.CH.60 | Barahonaite-(Al) | (Ca,Cu,Na,Fe3+,Al)12Al2(AsO4)8(OH,Cl)x · nH2O |
| 8.CH.70 | Epifanovite | NaCaCu5(PO4)4[AsO2(OH)2] · 7H2O |
| 8.CH.75 | Esdanaite-(Ce) | NaMnCe(PO4)2 · 4H2O |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Rimkorolgite
mindat.org URL:
https://www.mindat.org/min-3420.html
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Please feel free to link to this page.
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References for Rimkorolgite
Reference List:
Britvin, S. N., Pakhomovsky, Y. A., Bogdanova, A. N., Khomjakov, A. P., Krashova, N. I. (1995) Rimkorolgite (Mg,Mn)5(Ba,Sr,Ca) (PO4)4·8H2O — the new mineral from Kovdor iron deposit (Kola Peninsula) Zapiski Vserossijskogo Mineralogicheskogo Obshchestva, 124 (1) 90-95
Localities for Rimkorolgite
Showing 2 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Russia | |
| Liferovich et al. (1998) +1 other reference |
| Britvin et al. (1995) +5 other references |
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Kovdor Zheleznyi Mine, Kovdor Massif, Kovdorsky District, Murmansk Oblast, Russia