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Orientite (Orientit)

Pictures (6 Images total)

Orientite
Views (File:
1475010215
): 532
Orientite
Orange sherbet ";creamsicle"; crystals of orientite with brown macfallite-filled centers. The orientite crystals actually frame crystals of macfallite at 90 degree angles; some with a gap between the two species. It is one of the last (and most interesting) specimens I collected from the underground workings in 2012 before the drift was sealed; Field of view: 3.3 mm; Manganese Mine, Copper Harbor, Keweenaw Co., Michigan, USA
Copyright: Travis Olds; Contribution: Stefan
Location: USA/Michigan/Keweenaw Peninsula/Keweenaw Co./Copper Harbor/Manganese Mine
Mineral: Orientite
Image: 1475010215
Rating: 10 (votes: 1)
License: Usage for Mineralienatlas project only
Orientite

Orange sherbet ";creamsicle"; crystals of orientite with brown macfallite-filled centers. The orientite crystals actually frame crystals of macfallite at 90 degree angles; some with a gap between t...
Copyright: Travis Olds
Contribution: Stefan 2016-09-27
Locality: Manganese Mine / Copper Harbor / Keweenaw Co. / Keweenaw Peninsula / Michigan / USA
Orientit
Views (File:
1300997521
): 838
Orientit
Größe: 9,23 mm; Fundort: Grube Cerchiara, Vara-Tal, Ligurien, Italien
Copyright: Matteo Chinellato; Contribution: Hg
Location: Italien/Ligurien (Liguria), Region/La Spezia, Provinz/Vara-Tal/Cerchiara Mine
Mineral: Orientite
Image: 1300997521
Rating: 7.5 (votes: 2)
License: Usage for Mineralienatlas project only
Orientit

Größe: 9,23 mm; Fundort: Grube Cerchiara, Vara-Tal, Ligurien, Italien
Copyright: Matteo Chinellato
Contribution: Hg 2011-03-24
Locality: Cerchiara Mine / Vara-Tal / La Spezia, Provinz / Ligurien (Liguria), Region / Italien
Orientit
Views (File:
1300997461
): 1042
Orientit
Größe: 9,14 mm; Fundort: Grube Cerchiara, Vara-Tal, Ligurien, Italien
Copyright: Matteo Chinellato; Contribution: Hg
Location: Italien/Ligurien (Liguria), Region/La Spezia, Provinz/Vara-Tal/Cerchiara Mine
Mineral: Orientite
Image: 1300997461
Rating: 8 (votes: 1)
License: Usage for Mineralienatlas project only
Orientit

Größe: 9,14 mm; Fundort: Grube Cerchiara, Vara-Tal, Ligurien, Italien
Copyright: Matteo Chinellato
Contribution: Hg 2011-03-24
Locality: Cerchiara Mine / Vara-Tal / La Spezia, Provinz / Ligurien (Liguria), Region / Italien
Orientit
Views (File:
1345043975
): 744
Orientit
Nadelige dunkelrotbraune Kristalle, BB = 11 mm, Fundort: Manganese Mine, Copper Harbor, Keweenaw Co., Michigan, USA.
Copyright: Manfred Früchtl; Contribution: Manfred Früchtl
Collection: Lithothek der Münchener Micromounter, Collection number: A000142, Donator: Klaus Fleck
Location: USA/Michigan/Keweenaw Peninsula/Keweenaw Co./Copper Harbor/Manganese Mine
Mineral: Orientite
Image: 1345043975
Rating: 7 (votes: 1)
License: Usage for Mineralienatlas project only
Orientit (SNr: A000142)

Nadelige dunkelrotbraune Kristalle, BB = 11 mm, Fundort: Manganese Mine, Copper Harbor, Keweenaw Co., Michigan, USA.
Collection: Lithothek der Münchener Micromounter
Copyright: Manfred Früchtl
Contribution: Manfred Früchtl 2012-08-15
Locality: Manganese Mine / Copper Harbor / Keweenaw Co. / Keweenaw Peninsula / Michigan / USA
Macfallit (blockig) und Orientit (strahlig)
Views (File:
1281242388
): 972
Macfallit (blockig) und Orientit (strahlig)
Bildbreite: 4 mm; Fundort: Manganese Mine, Copper Harbor, Keweenaw Co., Michigan, USA
Copyright: Joachim Esche; Contribution: Philip Blümner
Location: USA/Michigan/Keweenaw Peninsula/Keweenaw Co./Copper Harbor/Manganese Mine
Mineral: Macfallite, Orientite
Image: 1281242388
Rating: 5 (votes: 2)
License: Usage for Mineralienatlas project only
Macfallit (blockig) und Orientit (strahlig)

Bildbreite: 4 mm; Fundort: Manganese Mine, Copper Harbor, Keweenaw Co., Michigan, USA
Copyright: Joachim Esche
Contribution: Philip Blümner 2010-08-08
Locality: Manganese Mine / Copper Harbor / Keweenaw Co. / Keweenaw Peninsula / Michigan / USA

You find additional specimen at the Geolitho Museum

Collectors Summary

Color braun, schwarz
Streak color braun
Lustre Harzglanz, Halbmetallglanz
Hardness (Mohs) 4.75
Crystal System orthorhombisch, P2mm

Chemism

Chemical formula

Ca8Mn3+10(SiO4)3(Si3O10)3(OH)10·4H2O

Chemical composition

Calcium, Mangan, Silicium, Sauerstoff, Wasserstoff

Unit weight: 2121.145185 u; Number of atoms in the formula: 104

Info

Empirical formula:

Ca8Mn10(SiO4)3(Si3O10)3(OH)10·4H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.86

18

17.31

1.0079470

18.1430460
Oxygen

O

42.24

56

53.85

15.9994300

895.9680800
Silicon

Si

15.89

12

11.54

28.0855300

337.0263600
Calcium

Ca

15.12

8

7.69

40.0784000

320.6272000
Manganese

Mn

25.90

10

9.62

54.9380499

549.3804990

Analysis wt%

Ø CaO : 22.47, Al2O3 : 1.08, Mn2O3 : 33.19, Fe2O3 : 1.56, SiO2 : 32.48, H2O : 7.93 (Ref: Am.J.Sci.21)

Strunz 9th edition incl. updates

9.BJ.05

9: Silikate (Germanate)
B: Gruppensilikate (Sorosilikate)
J: Gruppen(Soro)-Silikate mit Si3O10, Si4O11, etc. Anionen; Kationen in oktahedraler [6] und/oder größerer Koordination
05:Orientit-Gruppe

Lapis Classification

VIII/C.34-070

VIII: SILIKATE
C: Gruppensilikate
34: Sonstige Gruppensilikate

Classification by Hölzel

9.BQ.260

9: SILICATES
B: Sorosilicates
Q: Si3O10 + SiO4-Group

Dana 8th edition

58.03.01.02

58: Sorosilicates Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups
03: Sorosilicates Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups with insular single and triple groups (n=1,3)
01: Ardennite group

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

Optical Properties

Color

braun, schwarz

Streak color

braun

Diaphaneity (Transparency)

durchscheinend bis opak

Lustre

Harzglanz, Halbmetallglanz

max. Birefringence

0.038
Birefringence chart\! Orientite title=Birefringence chart Orientite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.756

RI value β

1.777

RI value γ / ε

1.794

Ri mean

1.776

2V angle

Biaxial (-) 76°!

Orientation

X = b, Y = c, Z = a

Dispersion

sehr stark, r < v

Absorption

Z > Y > X

Pleochroism

gelb, braun, bräunlichrot

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mm2

Space Group number

25

Space Group

P2mm

Cell parameters a (Å)

9.074

Cell parameters b (Å)

19.130

Cell parameters c (Å)

6.121

Cell parameters a/b or c/a

0.474

Cell parameters c/b

0.320

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

1

Volume (ų)

1062.518

X-Ray Powder Diffraction

9.479(70),
5.042(100),
4.504(40),
4.383(70),
4.070(60),
3.040(70),
2.688(70),
2.523(100)
XRD chart Orientite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

4.75

VHN (Hardness Vickers)

340 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.33 (gemessen) 3.25 (berechnet)

3.315 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Kuba/Santiago de Cuba, Provinz/Firmeza, Municipio/Bueycito

Preface

Author (Name, Year)

Hewett & Shannon, 1921

References

American Journal of Science 1 (1921), 491

American Mineralogist 71 (1986), 176

Other languages

German

Orientit

Spanish

Orientita

French

Orientite

English

Orientite

Russian

Ориентит

Simplified Chinese

锰柱石

Japanese

ｵﾘｴﾝﾄ石

CNMNC symbol

Symbol

Orn

Locations with GPS information

IDs

GUSID (Global unique identifier short form) iU31v9bckUOxoMe7TWnX1Q
GUID (Global unique identifier) BFF54D89-DCD6-4391-B1A0-C7BB4D69D7D5
Database ID 2837