Orientite (original) (raw)

A valid IMA mineral species - grandfathered

About OrientiteHide

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Formula:

Ca8Mn3+10(SiO4)3(Si3O10)3(OH)10 · 4H2O

Colour:

Light reddish brown, chocolate-brown

Lustre:

Resinous, Sub-Metallic, Dull

Specific Gravity:

3.05 - 3.33

Crystal System:

Orthorhombic

Name:

Named in 1921 by Donnel Foster Hewett and Earl Vincent Shannon for the type locality, the Oriente Province in Cuba. In 1976, Oriente Province was split up into 6 provinces. The type locality is now located in Santiago de Cuba Province.

This page provides mineralogical data about Orientite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:3017:1

272f304d-74fe-4749-8622-4ee1c25c70a5

IMA Classification of OrientiteHide

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Approved, 'Grandfathered' (first described prior to 1959)

IMA Formula:

Ca8Mn3+10(SiO4)3(Si3O10)3(OH)10 · 4H2O

Type description reference:

Classification of OrientiteHide

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9.BJ.05

9 : SILICATES (Germanates)
B : Sorosilicates
J : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in octahedral [6] and greater coordination

58.3.1.2

58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
3 : Insular, Mixed, Single, and Larger Tetrahedral Groups with insular single and triple groups (n=1, 3)

14.18.22

14 : Silicates not Containing Aluminum
18 : Silicates of Mn and Na, K, Mg, Ca or Fe

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of OrientiteHide

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Resinous, Sub-Metallic, Dull

Transparency:

Transparent, Translucent

Colour:

Light reddish brown, chocolate-brown

Cleavage:

Imperfect/Fair
Perfect to imperfect on {001}
may be parting

Density:

3.05 - 3.33 g/cm3 (Measured) 3.48 g/cm3 (Calculated)

Optical Data of OrientiteHide

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RI values:

_n_α = 1.756 - 1.765 _n_β = 1.777 - 1.790 _n_γ = 1.794 - 1.810

2V:

Measured: 67° to 83°, Calculated: 90°

δ = 0.038 - 0.045

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Dispersion:

relatively strong

Comments:

X = red-brown to brownish yellow; Y = yellow to reddish brown; Z = brownish yellow to deep brownish red

Chemistry of OrientiteHide

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Mindat Formula:

Ca8Mn3+10(SiO4)3(Si3O10)3(OH)10 · 4H2O

Common Impurities:

Al,Fe,V,Cu,Mg,K,H2O,S

Crystallography of OrientiteHide

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Crystal System:

Orthorhombic

Class (H-M):

m m m _(_2/_m_2/_m_2/m ) - Dipyramidal

Cell Parameters:

a = 9.074(4) Å, b = 6.121(2) Å, c = 19.130(7) Å

Ratio:

a:b:c = 1.482 : 1 : 3.125

Unit Cell V:

1,062.52 ų (Calculated from Unit Cell)

Comment:

Space Group: Ccmm:

Crystal StructureHide

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CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of OrientiteHide

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Place of Conservation of Type Material:

National Museum of Natural History, Washington, D.C., USA, 93819.
The Natural History Museum, London, England, 1923,1029.

Reference:

Hewett, D.F. and E.V. Shannon (1921) Orientite, a new hydrous silicate of manganese and calcium from Cuba. American Journal of Science: 1: 491-506.

Other Language Names for OrientiteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for OrientiteHide

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References for OrientiteHide

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Localities for OrientiteHide

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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.