Pertsevite Mineral Data

General Pertsevite Information

Chemical Formula:

Mg2(BO3)F

Composition:

Molecular Weight = 130.82 gm

Calcium 0.31 % Ca 0.43 % CaO

Magnesium 35.11 % Mg 58.23 % MgO

Manganese 0.42 % Mn 0.54 % MnO

Iron 2.99 % Fe 3.84 % FeO

Silicon 3.86 % Si 8.27 % SiO₂

Boron 7.02 % B 22.62 % B₂O₃

Hydrogen 0.19 % H 1.72 % H₂O

Oxygen 42.68 % O

Fluorine 7.41 % F 7.41 % F

- % F -3.12 % -O=F₂

______ ______

100.00 % 99.94 % = TOTAL OXIDE

Empirical Formula:

Mg_1.89Fe²⁺_0.07Mn²⁺_0.01Ca_0.01B_0.85Si_0.18O_3.24F_0.51(OH)_0.25

Environment:

Contact-metasomatic kotoite marble. Isostructural with Mg2(BO3)F; structure determined.

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Near the mouth of Kebirin’ya Creek, a northern tributary of Dogdo River, in the basin of the River Yana, about 250 km east of Verkhoyansk, Sakha-Yakutia, Russia Link to MinDat.org Location Data.

Name Origin:

After Nikolai Nikolayewich Pertsev (b. 1930), IGEM, Moscow, in recognition of his work on boron minerals and deposits.

Synonym:

IMA2002-030

Pertsevite Image

Images:

Pertsevite

Comments: Backscattered electron (BSE) picture of pertsevite (P, darker grey) partially replacing clinohumite (C, lighter grey). The still lighter grey mineral with cleavage at the top contacting only pertsevite is calcite. (Eur. J. Mineral, 15:1008).
Location: Contact-metasomatic kotoite marble from the region east of Verkhoyansk, Sakha-Yakutia, northeastern Siberia.. Scale: See Image.
© Eur. J. Mineral

Pertsevite Crystallography

Axial Ratios:

a:b:c =4.4826:1:2.6011

Cell Dimensions:

a = 20.49, b = 4.571, c = 11.89, Z = 12; V = 1,113.61 Den(Calc)= 2.34

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: P na2₁

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

By Intensity(I/I_o): 2.2409(1)(414), 1.7081(0.92)(424), 2.7425(0.77)(313),2.2344(0.49)(810), 2.4737(0.49)(114), 2.4137(0.46)(711), 1.7053(0.44)(820),

Crystal Structure:

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Schreyer W , Armbruster T , Bernhardt H J , Medenbach O , European Journal of Mineralogy , 15 (2003) p.1007-1018, Pertsevite, a new silication magnesioborate mineral with an end-member, composition Mg2BO3F, in kotoite marble from east of Verkhoyansk, Sakha-Yakutia, Russia, Locality: east of Verkhoyansk, Sakha-Yakutia, Russia

Physical Properties of Pertsevite

Cleavage:

None

Color:

Colorless.

Diaphaneity:

Transparent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Pertsevite

Gladstone-Dale:

CI calc= -0.327 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2665,KC= 0.2008
Ncalc = 1.47

Optical Data:

Biaxial (+), a=1.609, b=1.62, g=1.642, bire=0.0330, 2V(Calc)=72, 2V(Meas)=65. Dispersion dispersion not observed.

Calculated Properties of Pertsevite

Electron Density:

Bulk Density (Electron Density)=2.31 gm/cc
note: Specific Gravity of Pertsevite =2.34 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_Pertsevite= 2.07 barns/electron
U=PE_Pertsevite x rElectron Density= 4.78 barns/cc.

Radioactivity:

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

Pertsevite Classification

Dana Class:

25.06.04.01 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.06)Dana Type

(25.06.04)Dana Group

25.06.04.01 Pertsevite! Mg2(BO3)F P na2₁ mm2

25.06.04.02 IMA2008-060! Mg2(BO3)(OH) P nma 2/m 2/m 2/m

Strunz Class:

06.AB.75 06 - BORATES

06.A - Monoborates

06.AB -BO3, with additional anions; 1(D) + OH, etc.

06.AB.75 Pertsevite! Mg2(BO3)F P na2₁ mm2

06.AB.75 IMA2008-060! Mg2(BO3)(OH) P nma 2/m 2/m 2/m

Other Pertsevite Information

References:

NAME( CanMin, 42:1251) PHYS. PROP.(CanMin, 42:1251) OPTIC PROP.(CanMin, 42:1251)

See Also:

Links to other databases for Pertsevite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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

Pertsevite

Mg2(BO3)F
Dana No: 25.06.04.01 Strunz No: 06.AB.75
Locality:

Notes: