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Ferri-obertiite

Pictures (2 Images total)

Ferri-Obertiit
Views (Image: 1459878223): 1044
Ferri-Obertiit

Rothenberg, Bell , Eifel, Rheinland-Pfalz, Deutschland; rosa xx Aggregate in Druse (Bildhöhe ca. 3 mm)

Collection: Hans-Jürgen H. (sulzbacher)
Copyright: J. Desor
Contribution: sulzbacher 2016-04-05
Locality: Rothenberg / Bell / Mendig, Verbandsgemeinde / Mayen-Koblenz-Kreis / Rheinland-Pfalz / Deutschland
Ferri-Obertiit
Views (Image: 1600613054): 348
Ferri-Obertiit

Rothenberg, Bell, Mayen/Eifel; Bildbreite 5,2 mm.

Collection: Guy Heinen
Copyright: Guy Heinen
Contribution: guyhein 2020-09-20
Locality: Rothenberg / Bell / Mendig, Verbandsgemeinde / Mayen-Koblenz-Kreis / Rheinland-Pfalz / Deutschland

Collectors Summary

Color rosa-orange
Crystal System monoklin, C2/m

Chemism

Chem­ical formula

NaNa2(Mg3Fe3+Ti)Si8O22O2

Chem­ical com­po­si­tion

Eisen, Magnesium, Natrium, Silicium, Titan, Sauerstoff

Unit weight: 854.2673506 u; Number of atoms in the formula: 40

Info

Empirical formula:

NaNa2(Mg3FeTi)Si8O22O2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

44.95

24

60.00

15.9994300

383.9863200

Sodium

Na

8.07

3

7.50

22.9897702

68.9693106

Magnesium

Mg

8.54

3

7.50

24.3050600

72.9151800

Silicon

Si

26.30

8

20.00

28.0855300

224.6842400

Titanium

Ti

5.60

1

2.50

47.8671000

47.8671000

Iron

Fe

6.54

1

2.50

55.8452000

55.8452000

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

IMA sta­tus

anerkannt - Neue Mineralien anerkannt und geprüft November 2015, CNMNC Newsletter No. 28, December 2015, page 1860; Mineralogical Magazine, 79, 1859–1864.

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

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

Optical Properties

Color

rosa-orange

max. Birefrin­gence

0.058

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

α = 1.664(2)

RI value β

β = 1.680(2)

RI value γ / ε

γ = 1.722(2)

2V angle

Biaxial (+) 66.4(3)° (gemessen) 64.7° (berechnet)

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell param­e­ters a (Å)

9.7901(7)

Cell param­e­ters b (Å)

17.935(1)

Cell param­e­ters c (Å)

5.2892(4)

Cell param­e­ters a/b or c/a

0.546

Cell param­e­ters c/b

0.295

Cell param­e­ters α

90°

Cell param­e­ters β

104.142(2)

Cell param­e­ters γ

90°

Z

2

Volumne (ų)

900.56

Kristall struc­ture

Struktur bestimmt

X-Ray Pow­der Diffrac­tion

8.391(72), 3.388(72), 3.260(37), 3.116(76), 2.704(100), 2.583(39), 2.529(67), 2.160(39)

XRD chart Ferri-obertiite

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

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

3.15 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Deutschland/Rheinland-Pfalz/Mayen-Koblenz-Kreis/Mendig, Verbandsgemeinde/Bell/Rothenberg

Type mate­r­ial

Museo di Mineralogia, Dipartimento di Scienze della Terra e dell’Ambiente, Università di Pavia, Italien

Col­lec­tion number of type mate­r­ial

2015–02

Par­a­ge­n­e­sis of type mate­r­ial

Kaliumfeldspat, Alpha-Quarz paramorph nach Beta-Quarz, Eifelit (das zweite Vorkommen nach dem Caspar-Steinbruch am Vulkan Bellerberg, Eifel), Tridymit, Rutil, Roedderit und andere Amphibole

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)

Roberta Oberti, Massimo Boiocchi, Frank C. Hawthorne, Neil A. Ball and Günter Blass (2017)

References

Roberta Oberti, Elio Cannillo and Giuseppe Toscani - How to name amphiboles after the IMA2012 report: rules of thumb and a new PC program for monoclinic amphiboles: Periodico di Mineralogia Volume 81 (2012) issue 2 pp 257-267

Frank C. Hawthorne, Roberta Oberti, George E. Harlow, Walter V. Maresch, Robert F. Martin, John C. Schumacer, Mark D. Welch - Nomenclature of the amphibole supergroup, American Mineralogist, Volume 97 (2012), pages 2031–2048

Oberti, R., Boiocchi, M., Hawthorne, F.C., Ball, N.A. and Blass, G.(2015) Ferri-obertiite, IMA 2015-079. CNMNC Newsletter No. 28, December 2015, page 1863; Mineralogical Magazine, 79, 1859–1864.

Roberta Oberti, Massimo Boiocchi, Frank C. Hawthorne, Neil A. Ball, Gȕnter Blass: Ferri-obertiite from the Rothenberg quarry, Eifel volcanic complex, Germany: mineral data and crystal chemistry of a new amphibole end-member. Mineral Mag Vol. 81 (2017) S. 641-651.

IMA group assignments




 
 
 
 
NaNa2(Mg3Fe3+Ti)Si8O22O2
monoklin
C2/m

 
 
 
 
NaNa2(Fe2+3Fe3+Ti)Si8O22O2
monoklin
C2/m

 
 
 
 
NaNa2(Mg3Mn3+Ti4+)Si8O22O2
monoklin
C2/m

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Actuality: 22. May 2022 - 12:53:06

Other languages

German

Ferri-Obertiit

English

Ferri-obertiite

German

Ferriobertiit

Russian

Ферриобертиит

CNMNC (IMA)-Number

IMA 2015-079

CNMNC symbol

Symbol

Fob

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