Orthopinakiolite Mineral Data

Orthopinakiolite Mineral Data +

General Orthopinakiolite Information

Chemical Formula:

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

Composition:

Molecular Weight = 209.67 gm

Magnesium 17.39 % Mg 28.83 % MgO

Manganese 39.30 % Mn 16.92 % MnO / 37.65 % Mn₂O₃

Boron 5.16 % B 16.60 % B₂O₃

Oxygen 38.15 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg_1.5Mn²⁺_0.5Mn³⁺BO₅

IMA Status:

Approved IMA 1960

Locality:

Link to MinDat.org Location Data.

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

Diaphaniety:

Opaque

Fracture:

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

Hardness:

6 - Orthoclase

Luster:

Metallic

Streak:

brown gray

Calculated Properties of Orthopinakiolite

Electron Density:

r_electron=3.81 gm/cc
note: r_{Orthopinakiolite}=3.97 gm/cc.

Fermion Index

Fermion Index = 0.02783
Boson Index = 0.97217

Photoelectric:

PE_{Orthopinakiolite}= 10.58 barns/electron
U=PE_{Orthopinakiolite} x r_electron= 40.27 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Orthopinakiolite is Not Radioactive

Orthopinakiolite Classification

Dana Class:

24.2.5.1 (24)Borates - Anhydrous

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

(24.2.5)Dana Group

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

Strunz Class:

V/G.04-80 V - Nitrates, Carbonates and Borates

V/G - "Insel" borates [BO3]3- "inseln"

V/G.04 - Ludwigite group

V/G.04-10 Ludwigite Mg2FeBO5 Pbam 2/m 2/m 2/m

V/G.04-20 Vonsenite Fe2FeBO5 Pbam 2/m 2/m 2/m

V/G.04-30 Azoproite (Mg,Fe)2(Fe,Ti,Mg)BO5 Pbam 2/m 2/m 2/m

V/G.04-40 Chestermanite Mg2(Fe,Mg,Al,Sb)BO3O2 Pbam 2/m 2/m 2/m

V/G.04-50 Fredrikssonite Mg2(Mn,Fe)O2(BO3) Pbam 2/m 2/m 2/m

V/G.04-60 Bonaccordite Ni2FeBO5 Pbam 2/m 2/m 2/m

V/G.04-70 Takeuchiite Mg2MnO2(BO3) Pnnm 2/m 2/m 2/m

V/G.04-80 Orthopinakiolite (Mg,Mn)2MnBO5 Pnnm 2/m 2/m 2/m

V/G.04-90 Blatterite (Mn,Mg)35Sb3(Mn,Fe)9(BO3)16O32 Pnnm 2/m 2/m 2/m

V/G.04-100 Gaudefroyite Ca4Mn3-x(BO3)3(CO3)(O,OH)3 P 6₃ 6

Other Orthopinakiolite Information

References:

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 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Orthopinakiolite

(Mg,Mn++)2Mn+++BO5
Dana No: 24.2.5.1 Strunz No: V/G.04-80
Locality:

Notes: