Mineralogy Database

Orientite Mineral Data

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General Orientite Information

Help on Chemical  Formula: Chemical Formula: Ca2Mn++Mn+++2Si3O10(OH)4
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca2Mn2+Mn3+2Si3O10(OH)4
Help on Environment: Environment: Low temperature origin.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1921
Help on Locality: Locality: Oriente Province, Cuba. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Name Pronunciation: Name Pronunciation: Orientite + Pronunciation Say ORIENTITE
Help on Synonym: Synonym: ICSD 201730
  PDF 41-589

Orientite Image

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

Orientite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6725:1:2.1172
Help on Cell Dimensions: Cell Dimensions: a = 6.08, b = 9.04, c = 19.14, Z = 4; V = 1,052.00 Den(Calc)= 3.52
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: C mcm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.704(1), 4.393(0.9), 5.06(0.9),

Physical Properties of Orientite

Help on Cleavage: Cleavage: {001} Indistinct, {120} Indistinct
Help on Color: Color: Brown, Black.
Help on Density: Density: 3
Help on Diaphaneity: Diaphaneity: Translucent to opaque
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: brown

Optical Properties of Orientite

Help on Gladstone-Dale: 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
Help on Optical Data: 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.
Help on Pleochroism (x): Pleochroism (x): colorless or pale yellow.
Help on Pleochroism (y): Pleochroism (y): reddish brown or yellowish brown.
Help on Pleochroism (z): Pleochroism (z): yellowish brown or deep brown.

Calculated Properties of Orientite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.94 gm/cc
note: Specific Gravity of Orientite =3.00 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0074492774
Boson Index = 0.9925507226
Help on Photoelectric: Photoelectric: PEOrientite = 9.87 barns/electron
U=PEOrientite x rElectron Density= 29.01 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Orientite is Not Radioactive

Orientite Classification

Help on  Dana Class: Dana Class: (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 Ardennite-(As) (Mn,Ca,Mg)4(Al,Mg,Fe)6(SiO4)2(Si3O10)(AsO4,VO4)(OH)6 Pnmm 2/m 2/m 2/m Orientite Ca2MnMn2Si3O10(OH)4 C mcm 2/m 2/m 2/m Ardennite-(V)! Mn4[Al4(Mg,Al,Fe,Mn)2][Si5(V,Si)]O22(OH)6 Pnmm 2/m 2/m 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: 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

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Dana No: Strunz No: 09.BJ.05





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