Orthopinakiolite Mineral Data

General Orthopinakiolite Information

Chemical Formula:

(Mg,Mn++)2Mn+++BO5

Composition:

Molecular Weight = 209.58 gm

Magnesium 16.47 % Mg 27.31 % MgO

Manganese 34.34 % Mn 14.55 % MnO / 33.15 % Mn₂O₃

Iron 5.86 % Fe 8.38 % Fe₂O₃

Boron 5.16 % B 16.61 % B₂O₃

Oxygen 38.17 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg_1.42Mn²⁺_0.43Mn³⁺_0.88Fe³⁺_0.22BO₅

Environment:

Veinlets in granular dolomite in a metamorphosed Fe-Mn orebody.

IMA Status:

Approved IMA 1960

Locality:

Langban, V¨armland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named as an ORTHOrhombic mineral related to pinakiolite.

Name Pronunciation:

Orthopinakiolite + Pronunciation

Synonym:

ICSD 200425

PDF 33-656

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Orthopinakiolite Crystallography

Axial Ratios:

a:b:c =1.4579:1:0.4819

Cell Dimensions:

a = 18.357, b = 12.591, c = 6.068, Z = 16; V = 1,402.51 Den(Calc)= 3.97

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnnm

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

By Intensity(I/I_o): 2.596(1), 2.531(0.85), 5.192(0.65),

Crystal Structure:

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Takeuchi Y , Haga N , Kato T , Miura Y , The Canadian Mineralogist , 16 (1978) p.475-485, Orthopinakiolite, Me2.95O2[BO3]: its crystal structure, and relationship to pinakiolite, Me2.90O2[BO3], Note: z-coordinate of O9 changed. y-coordinate of M7* changed.

Physical Properties of Orthopinakiolite

Cleavage:

{010} Good

Color:

Black.

Density:

4.03

Diaphaneity:

Opaque

Fracture:

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

Hardness:

6 - Orthoclase

Luster:

Metallic

Streak:

brown gray

Optical Properties of Orthopinakiolite

Optical Data:

NCalc= 1.97 - from Gladstone-Dale relationship (KC = 0.2452) where Ncalc=Dcalc*KC+1
NCalc= 1.99 - from Gladstone-Dale relationship (KC = 0.2452) where Ncalc=Dmeas*KC+1

Calculated Properties of Orthopinakiolite

Electron Density:

Bulk Density (Electron Density)=3.81 gm/cc
note: Specific Gravity of Orthopinakiolite =3.97 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Orthopinakiolite}= 11.05 barns/electron
U=PE_{Orthopinakiolite} x rElectron Density= 42.09 barns/cc.

Radioactivity:

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

Orthopinakiolite Classification

Dana Class:

24.02.05.01 (24)Borates - Anhydrous

(24.02)where (A)2 BO2 [XO3]

(24.02.05)Dana Group

24.02.05.01 Orthopinakiolite (Mg,Mn)2MnBO5 Pnnm 2/m 2/m 2/m

Strunz Class:

06.AB.40 06 - BORATES

06.A - Monoborates

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

06.AB.40 Blatterite (Mn,Mg)35Sb3(Mn,Fe)9(BO3)16O32 Pnnm 2/m 2/m 2/m

06.AB.40 Chestermanite Mg2(Fe,Mg,Al,Sb)BO3O2 Pbam 2/m 2/m 2/m

06.AB.40 Orthopinakiolite (Mg,Mn)2MnBO5 Pnnm 2/m 2/m 2/m

06.AB.40 Takeuchiite Mg2MnO2(BO3) Pnnm 2/m 2/m 2/m

Other Orthopinakiolite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Orthopinakiolite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - CalTech Mineral Spectroscopy
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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

Orthopinakiolite

(Mg,Mn++)2Mn+++BO5
Dana No: 24.02.05.01 Strunz No: 06.AB.40
Locality:

Notes: