Pertsevite-(OH)
A valid IMA mineral species
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About Pertsevite-(OH)
Formula:
Mg2(BO3)(OH)
Colour:
colorless or have a light brown hue
Lustre:
Vitreous
Hardness:
5½ - 6½
Specific Gravity:
3.156 (Calculated)
Crystal System:
Orthorhombic
Name:
Named for the hydroxyl dominant pertsevite.
Unique Identifiers
Mindat ID:
7660
Long-form identifier:
mindat:1:1:7660:5
Similar Names
| Pertsevite-(F) | A valid IMA mineral species | Mg2(BO3)(F,OH) |
IMA Classification of Pertsevite-(OH)
Classification of Pertsevite-(OH)
6.AB.75
6 : BORATES
A : Monoborates
B : BO3, with additional anions; 1(D) + OH, etc.
6 : BORATES
A : Monoborates
B : BO3, with additional anions; 1(D) + OH, etc.
25.1.6.2
25 : ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
1 : Monoborates
25 : ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
1 : Monoborates
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 |
|---|---|---|
| Psv-OH | 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 Pertsevite-(OH)
Vitreous
Colour:
Colorless or have a light brown hue
Hardness:
5½ - 6½ on Mohs scale
Hardness:
VHN50=290 - 339 kg/mm2 - Vickers
Cleavage:
Imperfect/Fair
Fracture:
Conchoidal
Density:
3.156 g/cm3 (Calculated)
Optical Data of Pertsevite-(OH)
Type:
Biaxial
RI values:
nα = 1.611(1) nβ = 1.623(1) nγ = 1.644(1)
2V:
Measured: 55° to 65°, Calculated: 75°
Max. Birefringence:
δ = 0.033
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:
High (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.
Chemistry of Pertsevite-(OH)
Mindat Formula:
Mg2(BO3)(OH)
Element Weights:
Elements listed:
Crystallography of Pertsevite-(OH)
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Space Group:
Pnma
Setting:
Pnma
Cell Parameters:
a = 20.494(3) Å, b = 11.890(2) Å, c = 4.5880(6) Å
Ratio:
a:b:c = 1.724 : 1 : 0.386
Unit Cell V:
1,117.97 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.748 Å | (65) |
| 2.478 Å | (41) |
| 2.417 Å | (39) |
| 2.244 Å | (88) |
| 2.237 Å | (42) |
| 1.713 Å | (100) |
| 1.710 Å | (45) |
| 1.481 Å | (50) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) | |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Pertsevite-(OH)
General Appearance of Type Material:
fractured grains up to 1 mm in size in a ludwigite-kotoite magnesian skarn
Place of Conservation of Type Material:
sample number 3755/1 (Fersman Mineralogical Museum, Moscow, collection N.N. Pertsev, author’s number B-814)
Geological Setting of Type Material:
ludwigite-kotoite magnesian skarn
Associated Minerals at Type Locality:
Synonyms of Pertsevite-(OH)
Other Language Names for Pertsevite-(OH)
Dutch:Pertseviet-(OH)
German:Pertsevit-(OH)
Common Associates
Associations Based on Photo Data:
| 2 photos of Pertsevite-(OH) associated with Kotoite | Mg3[BO3]2 |
| 2 photos of Pertsevite-(OH) associated with Ludwigite | Mg2Fe3+(BO3)O2 |
| 2 photos of Pertsevite-(OH) associated with Pertsevite-(F) | Mg2(BO3)(F,OH) |
| 1 photo of Pertsevite-(OH) associated with Szaibélyite | MgBO2(OH) |
Related Minerals - Strunz-mindat Grouping
| 6.AB. | Chubarovite | KZn2(BO3)Cl2 |
| 6.AB. | Rhabdoborite-(Mo) | Mg12Mo6+1.33O6(BO3)6F2 |
| 6.AB.05 | Hambergite | Be2(BO3)(OH) |
| 6.AB.10 | Berborite | Be2(BO3)(OH) · H2O |
| 6.AB.15 | Jeremejevite | Al6(BO3)5(F,OH)3 |
| 6.AB.20 | Yuanfuliite | Mg(Fe3+,Al)O(BO3) |
| 6.AB.20 | Warwickite | (Mg,Ti,Fe,Al)2O(BO3) |
| 6.AB.25 | Karlite | (Mg,Al)6.5(BO3)3(OH)4(◻,Cl)0.5 |
| 6.AB.30 | Marinaite | Cu2Fe3+O2(BO3) |
| 6.AB.30 | Savelievaite | Mg2Cr3+O2(BO3) |
| 6.AB.30 | Fredrikssonite | Mg2Mn3+O2(BO3) |
| 6.AB.30 | Vonsenite | Fe2+2Fe3+(BO3)O2 |
| 6.AB.30 | Ludwigite | Mg2Fe3+(BO3)O2 |
| 6.AB.30 | Azoproite | (Mg,Fe2+)2(Fe3+,Ti,Mg)(BO3)O2 |
| 6.AB.30 | Bonaccordite | Ni2Fe3+(BO3)O2 |
| 6.AB.35 | Folvikite | Sb5+Mn3+(Mg,Mn2+)10O8(BO3)4 |
| 6.AB.35 | Pinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 |
| 6.AB.40 | Takéuchiite | (Mg,Mn2+)2(Mn3+,Fe3+)(BO3)O2 |
| 6.AB.40 | Blatterite | Sb5+3(Mn3+,Fe3+)9(Mn2+,Mg)35(BO3)16O32 |
| 6.AB.40 | Orthopinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 |
| 6.AB.40 | Chestermanite | Mg2(Fe3+,Mn3+,Al,Sb3+)(BO3)O2 |
| 6.AB.45 | Aluminomagnesiohulsite | (Mg,Fe2+)2(Al,Mg,Sn)(BO3)O2 |
| 6.AB.45 | Hulsite | Fe2+2Fe3+O2(BO3) |
| 6.AB.45 | Magnesiohulsite | Mg2Fe3+O2(BO3) |
| 6.AB.50 | Fluoborite | Mg3(BO3)(F,OH)3 |
| 6.AB.50 | Hydroxylborite | Mg3(BO3)(OH)3 |
| 6.AB.55 | Shabynite | Mg5(BO3)(OH)5(Cl,OH)2 · 4H2O |
| 6.AB.55 | Wightmanite | Mg5(BO3)O(OH)5 · 2H2O |
| 6.AB.60 | Gaudefroyite | Ca4Mn3+2-3(BO3)3(CO3)(O,OH)3 |
| 6.AB.65 | Sakhaite | Ca48Mg16(BO3)32(CO3)16 · 2(H2O,HCl) |
| 6.AB.70 | Harkerite | Ca48Mg16[AlSi4O15(OH)]4(BO3)16(CO3)16 · 2(H2O,HCl) |
| 6.AB.75 | Pertsevite-(F) | Mg2(BO3)(F,OH) |
| 6.AB.80 | Jacquesdietrichite | Cu2(H2BO3)(OH)3 |
| 6.AB.85 | Rhabdoborite-(V) | Mg12(V5+,Mo6+,W6+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x} (x < 1) |
| 6.AB.85 | Rhabdoborite-(W) | Mg12(W6+,V5+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x} |
| 6.AB.85 | Painite | CaZrAl9(BO3)O15 |
| 6.AB.90 | Mengxianminite | (Ca,Na)2Sn2(Mg,Fe)3Al8[(BO3)(BeO4)O6]2 |
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 Pertsevite-(OH)
mindat.org URL:
https://www.mindat.org/min-7660.html
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Please feel free to link to this page.
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References for Pertsevite-(OH)
Reference List:
Galuskina, Irina O., Kadiyski, Milen, Armbruster, Thomas, Galuskin, Evgeny V., Pertsev, Nikolai N., Dzierżanowski, Piotr, Wrzalik, Roman (2008) A new natural phase in the system Mg2SiO4Mg2BO3FMg2BO3(OH): composition, paragenesis and structure of OH-dominant pertsevite. European Journal of Mineralogy, 20 (5) 951-964 doi:10.1127/0935-1221/2008/0020-1821
Galuskina, I. O., Ottolini, L., Kadiyski, M., Armbruster, T., Galuskin, E. V., Dzierzanowski, P., Winiarski, A. (2010) Pertsevite-(OH), a new mineral in the pertsevite series, Mg2(BO3)1-x(SiO4)x(F,OH)1-x (x < 0.5), from the Snezhnoye deposit in Sakha-Yakutia Republic, Russia. American Mineralogist, 95 (7) 953-958 doi:10.2138/am.2010.3457
Localities for Pertsevite-(OH)
Showing 3 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 | |
| Galuskina et al. (2008) |
| Galuskina et al. (2008) +1 other reference |
USA | |
| Aleksandrov (2007) |
Quick NavTopAbout Pertsevite-(OH)Unique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Snezhnoe B ore occurrence, Izvestkovyi Stream, Titovskoe B deposit, Tas-Khayakhtakh Range, Dogdo River Basin, Polar Yakutia, Sakha, Russia