Orientite Mineral Data

Orientite Mineral Data +

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General Orientite Information

Chemical Formula:

Ca2Mn++Mn+++2Si3O10(OH)4

Composition:

Molecular Weight = 557.25 gm

Calcium 14.38 % Ca 20.13 % CaO

Manganese 29.58 % Mn 12.73 % MnO / 28.33 % Mn₂O₃

Silicon 15.12 % Si 32.35 % SiO₂

Hydrogen 0.72 % H 6.47 % H₂O

Oxygen 40.20 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂Mn²⁺Mn³⁺₂Si₃O₁₀(OH)₄

IMA Status:

Valid Species (Pre-IMA) 1921

Locality:

Oriente Province, Cuba. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Synonym:

ICSD 201730

PDF 41-589

Orientite Image

Images:

Orientite

Comments: Reddish brown massive orientite with pyrolusite.
Location: Oriente Province, Cuba. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Orientite Crystallography

Axial Ratios:

a:b:c =0.6725:1:2.1172

Cell Dimensions:

a = 6.08, b = 9.04, c = 19.14, Z = 4; V = 1,052.00 Den(Calc)= 3.52

Crystal System:

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

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

By Intensity(I/I_o): 2.704(1), 4.393(0.9), 5.06(0.9),

Crystal Structure:

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Moore P B , Shen J , Araki T , American Mineralogist , 70 (1985) p.171-181, Crystal chemistry of the (M2)3+ phi2 sheet: Structural principles and crystal, structures of ruizite, macfallite and orientite

View Additional jPOWD Structure files for Orientite
[1]

Physical Properties of Orientite

Cleavage:

[001] Indistinct, [120] Indistinct

Color:

Brown, Black.

Density:

Diaphaniety:

Translucent to opaque

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

4-5 - Fluorite-Apatite

Luster:

Vitreous (Glassy)

Streak:

brown

Optical Properties of Orientite

Optical Data:

Biaxial (+), a=1.758, b=1.776, g=1.795, bire=0.0370, 2V(Calc)=90, 2V(Meas)=68-83. Dispersion relatively strong.

Calculated Properties of Orientite

Electron Density:

r_electron=3.45 gm/cc
note: r_Orientite=3.52 gm/cc.

Fermion Index

Fermion Index = 0.00744
Boson Index = 0.99256

Photoelectric:

PE_Orientite= 9.87 barns/electron
U=PE_Orientite x r_electron= 34.04 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Orientite is Not Radioactive

Orientite Classification

Dana Class:

58.3.1.2 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups

(58.3)with insular single and triple groups (n=1,3)

(58.3.1)Ardennite group

58.3.1.1 Ardennite (Mn,Ca,Mg)4(Al,Mg,Fe)6(SiO4)2(Si3O10)(AsO4,VO4)(OH)6 Pnmm 2/m 2/m 2/m

58.3.1.2 Orientite Ca2MnMn2Si3O10(OH)4 C mcm 2/m 2/m 2/m

Strunz Class:

VIII/C.34-20 VIII - Silicates

VIII/C - Sorosilicates, other group-silicates

VIII/C.34 - Ardennite - Orientite series

VIII/C.34-10 Ardennite (Mn,Ca,Mg)4(Al,Mg,Fe)6(SiO4)2(Si3O10)(AsO4,VO4)(OH)6 Pnmm 2/m 2/m 2/m

VIII/C.34-14 Medaite (Mn,Ca)6(V,As)Si5O18(OH) P 2₁/n 2/m

VIII/C.34-16 Saneroite Na2(Mn,Fe)10Si11VO34(OH)4 P1 1

VIII/C.34-20 Orientite Ca2MnMn2Si3O10(OH)4 C mcm 2/m 2/m 2/m

Other Orientite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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

Orientite

Ca2Mn++Mn+++2Si3O10(OH)4
Dana No: 58.3.1.2 Strunz No: VIII/C.34-20
Locality:

Notes: