Orientite Mineral Data

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

Environment:

Low temperature origin.

IMA Status:

Valid Species (Pre-IMA) 1921

Locality:

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

Name Origin:

Named after its locality.

Name Pronunciation:

Orientite + Pronunciation

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:

Diaphaneity:

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

Gladstone-Dale:

CI meas= -0.07 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.088 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2205,KPDmeas= 0.2588,KC= 0.2419
Ncalc = 1.73 - 1.85

Optical Data:

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

Pleochroism (x):

colorless or pale yellow.

Pleochroism (y):

reddish brown or yellowish brown.

Pleochroism (z):

yellowish brown or deep brown.

Calculated Properties of Orientite

Electron Density:

Bulk Density (Electron Density)=2.94 gm/cc
note: Specific Gravity of Orientite =3.00 gm/cc.

Fermion Index:

Fermion Index = 0.0074492774
Boson Index = 0.9925507226

Photoelectric:

PE_Orientite= 9.87 barns/electron
U=PE_Orientite x rElectron Density= 29.01 barns/cc.

Radioactivity:

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

Orientite Classification

Dana Class:

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

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

(58.03.01)Ardennite group

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

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

58.03.01.03 Ardennite-(V)! Mn4[Al4(Mg,Al,Fe,Mn)2][Si5(V,Si)]O22(OH)6 Pnmm 2/m 2/m 2/m

Strunz Class:

09.BJ.05 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BJ -Sorosilicates with Si3O10, Si4O11, etc

09.BJ.05 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.(Dana8)

See Also:

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

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Ask about Orientite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Orientite

Ca2Mn++Mn+++2Si3O10(OH)4
Dana No: 58.03.01.02 Strunz No: 09.BJ.05
Locality:

Notes: