Pinakiolite Mineral Data

Pinakiolite Mineral Data +

General Pinakiolite Information

Chemical Formula:

Mg2Mn+++O2(BO3)

Composition:

Molecular Weight = 194.36 gm

Magnesium 25.01 % Mg 41.48 % MgO

Manganese 28.27 % Mn 40.61 % Mn₂O₃

Boron 5.56 % B 17.91 % B₂O₃

Oxygen 41.16 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₂Mn³⁺O₂(BO₃)

Environment:

In dolomite.

IMA Status:

Valid Species (Pre-IMA) 1890

Locality:

Langban, Varmland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for "small tablet", in allusion to the morphology.

Synonym:

ICSD 33723

PDF 36-413

Pinakiolite Image

Images:

Pinakiolite

Comments: Black submetallic platy pinakiolite crystals in white calcite.
Location: Langban, Varmland, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Pinakiolite Crystallography

Axial Ratios:

a:b:c =3.6456:1:0.8935

Cell Dimensions:

a = 21.79, b = 5.977, c = 5.341, Z = 8; beta = 95.63° V = 692.25 Den(Calc)= 3.73

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 2.51(1), 2.7(0.9), 5.42(0.8),1.99(0.6), 1.54(0.5), 1.5(0.4), 1.62(0.4), 2.16(0.4),

Forms:

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Crystal Structure:

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Moore P B , Araki T , American Mineralogist , 59 (1974) p.985-1004

Physical Properties of Pinakiolite

Cleavage:

[010] Good

Color:

Black.

Density:

3.88

Fracture:

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

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

6 - Orthoclase

Luster:

Adamantine - Metallic

Streak:

brown gray

Optical Properties of Pinakiolite

Gladstone-Dale:

CI meas= -0.272 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.323 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3224,KPDmeas= 0.31,KC= 0.2437

Optical Data:

Biaxial (-), a=1.908, b=2.05, g=2.65, bire=0.7420, 2V(Calc)=64, 2V(Meas)=32. Dispersion r < v.

Pleochroism (x):

reddish brown.

Pleochroism (y):

nearly opaque black.

Pleochroism (z):

yellowish red.

Calculated Properties of Pinakiolite

Electron Density:

r_electron=3.75 gm/cc
note: r_Pinakiolite=3.88 gm/cc.

Fermion Index

Fermion Index = 0.03627
Boson Index = 0.96373

Photoelectric:

PE_Pinakiolite= 7.85 barns/electron
U=PE_Pinakiolite x r_electron= 29.47 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pinakiolite is Not Radioactive

Pinakiolite Classification

Dana Class:

24.2.4.1 (24)Borates - Anhydrous

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

(24.2.4)Dana Group

24.2.4.1 Pinakiolite Mg2MnO2(BO3) C 2/m 2/m

Strunz Class:

V/G.03-20 V - Nitrates, Carbonates and Borates

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

V/G.03 - Warwickite - Hulsite series

V/G.03-05 Pertsevite! Mg2(BO3)F P na2₁ mm2

V/G.03-10 Warwickite Mg(Ti,Fe,Al)(BO3)O Pnam 2/m 2/m 2/m

V/G.03-15 Yuanfuliite (Mg,Fe)(Fe,Al,Mg,Ti,Fe)(BO3)O Pnam 2/m 2/m 2/m

V/G.03-20 Pinakiolite Mg2MnO2(BO3) C 2/m 2/m

V/G.03-25 Alumino-magnesiohulsite! Mg2(Al,Mg,Sn)(BO3)O2 P 2/m 2/m

V/G.03-30 Magnesiohulsite (Mg,Fe)2(Mg,Fe,Sn)O2(BO3) P 2/m 2/m

V/G.03-40 Hulsite (Fe,Mg)2(Fe,Sn)O2(BO3) P 2/m 2/m

Other Pinakiolite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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

Pinakiolite

Mg2Mn+++O2(BO3)
Dana No: 24.2.4.1 Strunz No: V/G.03-20
Locality:

Notes: