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Mangani-obertiite

Pictures (1 Images total)

Mangani-Obertiit
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Mangani-Obertiit

Bellerberg/Eifel; Bildbreite 1,7 mm.

Collection: Guy Heinen
Copyright: Guy Heinen
Contribution: guyhein 2020-09-20
Locality: Ettringer Bellerberg (Stbr. Caspar) / Bellerberg / Ettringen / Mayen / Mayen-Koblenz-Kreis / Rheinland-Pfalz / Deutschland

Collectors Summary

Color blassrosa
Hardness (Mohs) 5
Cleavages vollkommen {110}
Fracture muschelig
Crystal System monoklin, C2/m

Additional information / Summary

Das Mineral wurde zuerst als Obertit anerkannt (Hawthorne et al., American Mineralogist, 85, 236-241 (2000)); Nach einer Prüfung durch das Amphibol Subkomitee als Ferri-Obertit umbenannt (Hawthorne et al., American Mineralogist, 97, 2031–2048 (2012)). Eine gründliche Prüfung der chemischen Analyse ergab Mn3+ > Fe3+, daher wurde das Mineral zu Mangani-Obertite umbenannt.

Chemism

Chem­ical formula

NaNa2(Mg3Mn3+Ti4+)Si8O22O2

Chem­ical com­po­si­tion

Magnesium, Mangan, Natrium, Silicium, Titan, Sauerstoff

Unit weight: 853.3602005 u; Number of atoms in the formula: 40

Info

Empirical formula:

NaNa2(Mg3MnTi)Si8O22O2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

45.00

24

60.00

15.9994300

383.9863200

Sodium

Na

8.08

3

7.50

22.9897702

68.9693106

Magnesium

Mg

8.54

3

7.50

24.3050600

72.9151800

Silicon

Si

26.33

8

20.00

28.0855300

224.6842400

Titanium

Ti

5.61

1

2.50

47.8671000

47.8671000

Manganese

Mn

6.44

1

2.50

54.9380499

54.9380499

Anal­y­sis wt%

SiO2 : 54.53, TiO2 : 7.75, Fe2O3 : 2.61, Mn2O3 : 3.27, FeO : 3.36, MgO : 14.13, CaO : 0.52, K2O : 0.98, Na2O : 9.61, F : 0.55 (Ref: American Mineralogist 2000)

Strunz 9th edi­tion incl. updates

9.DE.25

9: Silikate (Germanate)
D: Ketten- und Bandsilikate (Inosilikate)
E: Ketten- und Bandsilikate mit 2-periodischen Doppelketten, Si4O11; Amphibol-Familie, Klinoamphibole
25:Amphibole: Alkali

Lapis Clas­sifica­tion

VIII/F.08-140

VIII: SILIKATE
F: Ketten- und Bandsilikate
8: Zweierbänder [Si4O11] 6-; Amphibol-Gruppe; Alkali-Amphibole

Clas­sifica­tion by Hölzel

9.DJ.840

9: SILICATES
D: Inosilicates; ~[Si2O6]4--...2-Chain
J: Amphiboles; Sodic Amphiboles
8: Ungarettiite-Group

Dana 8th edi­tion

66.01.03c.16

66: Inosilicates Inosilicate Double-Width Unbranched Chains, W=2
01: Inosilicates Inosilicate Double-Width Unbranched Chains, W=2 with P=2 amphibole configuration
03c: Group 4, the sodic amphiboles

IMA sta­tus

Anerkannt von der CNMNC

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

Amphibole supergroup  ⇒ O-dominant amphiboles  ⇒ Obertiite (Ob) amphiboles

Optical Properties

Color

blassrosa

max. Birefrin­gence

0.027

Birefringence chart\! Mangani-obertiite title=Birefringence chart Mangani-obertiite

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

1.643

RI value β

1.657

RI value γ / ε

1.670

Ri mean

1.657

2V angle

Biaxial (-) 81°

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell param­e­ters a (Å)

9.776

Cell param­e­ters b (Å)

17.919

Cell param­e­ters c (Å)

5.292

Cell param­e­ters a/b or c/a

0.546

Cell param­e­ters c/b

0.295

Cell param­e­ters α

90°

Cell param­e­ters β

104.5

Cell param­e­ters γ

90°

Z

2

Volumne (ų)

897.504

X-Ray Pow­der Diffrac­tion

8.414(100),
4.467(50),
3.390(60),
3.255(30),
3.117(50),
2.705(70),
2.577(30),
2.531(50)

XRD chart Mangani-obertiite

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)

5

VHN (Hard­ness Vick­ers)

390 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.16 (berechnet)

3.158 ( ρ calc. Mineralienatlas )

Cleav­ages

vollkommen {110}

Frac­ture

muschelig

Tenac­ity

spröde

Preface

Name from

Der Stammname Obertiite ehert Prof. Roberta Oberti, Universität von Pavia aus Italien, für seine Beiträge zur Kristallchemie der Amphibole.

Author (Name, Year)

Hawthorne & Cooper & Grice & Ottolini, 2000

References

American Mineralogist 85 (2000), 236

American Mineralogist 97 (2012), 2031-2048.

IMA group assignments

Other languages

German

Mangani-Obertiit

English

Mangani-obertiite

old name

English

Ferri-obertiite (ehemals)

Alternative Name

German

Manganiobertiit

CNMNC (IMA)-Number

IMA 1998-046

CNMNC symbol

Symbol

Mob

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Mangani-Obertiit
Google-Bilder-Suche - search for: Mangani-Obertiit
Mineralienatlas.de (Forum) - search for: Mangani-Obertiit

English pages

Mindat - search for: Mangani-obertiite
Webmineral - search for:Mangani-obertiite
Handbook-of-Mineralogy - search for: Mangani-obertiite
RRUFF - Raman, XRD and other mineral data - search for: Mangani-obertiite
RRUFF - References and PDF downloads - search for: Mangani-obertiite
American-Mineralogist-Crystal-Structure-Database - search for: Mangani-obertiite
Strahlen.org - search for: Mangani-obertiite

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Mangani-Obertiit
Crystal-Treasure.com - search for: Mangani-Obertiit
Bosse - search for: Mangani-Obertiit
Edelsteine Neuburg - Gundolf Fischer - search for: Mangani-Obertiit

Locations with GPS information