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Ferro-ferri-obertiite

Additional Functions

Collectors Summary

Color schwarz
Streak color grau
Hardness (Mohs) 6
Cleavages vollkommen (110)
Fracture splittrig
Crystal System monoklin, C2/m

Chemism

Chem­ical formula

NaNa2(Fe2+3Fe3+Ti)Si8O22O2

Addi­tional chem. informa­tion

Amphibole-Gruppe

Chem­ical com­po­si­tion

Eisen, Natrium, Silicium, Titan, Sauerstoff

Unit weight: 948.8877706 u; Number of atoms in the formula: 40

Info

Empirical formula:

NaNa2(Fe3FeTi)Si8O22O2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

40.47

24

60.00

15.9994300

383.9863200
Sodium

Na

7.27

3

7.50

22.9897702

68.9693106
Silicon

Si

23.68

8

20.00

28.0855300

224.6842400
Titanium

Ti

5.04

1

2.50

47.8671000

47.8671000
Iron

Fe

23.54

4

10.00

55.8452000

223.3808000

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.08-143

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

Clas­sifica­tion by Hölzel

9.DJ.850

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

IMA sta­tus

Anerkanntes Mineral - IMA-WEB-Seite, Neue Mineralien Aug 2009

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Classification

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

Optical Properties

Color

schwarz

Streak color

grau

max. Birefrin­gence

0.004
Birefringence chart\! Ferro-ferri-obertiite title=Birefringence chart Ferro-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

1.671

RI value β

1.674

RI value γ / ε

1.675

Ri mean

1.673

2V angle

Biaxial (-) 60°

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell param­e­ters a (Å)

9.845

Cell param­e­ters b (Å)

18.018

Cell param­e­ters c (Å)

5.296

Cell param­e­ters a/b or c/a

0.546

Cell param­e­ters c/b

0.294

Cell param­e­ters α

90°

Cell param­e­ters β

103.86°

Cell param­e­ters γ

90°

Z

2

Volumne (ų)

912.09

X-Ray Pow­der Diffrac­tion

8.515(80), 4.514(20), 3.407(60), 3.144(50), 2.722(100), 2.596(50), 2.533(40), 2.178(30)
XRD chart Ferro-ferri-obertiite

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

Physical Properties

Hard­ness (Mohs)

6

Density (g/cm³)

3.33 (berechnet)

3.455 ( ρ calc. Mineralienatlas )

Cleav­ages

vollkommen (110)

Frac­ture

splittrig

Tenac­ity

spröde

(Co-)Type locality

(Co-)Type locality

USA/Kalifornien (California)/Humboldt Co./Orick/Coyote Peak

Preface

Name from

Verwandtschaft mit Obertiit, von dem er sich durch die Substitution Fe2+ -> Mg ableiten lässt. Der Stammname Obertiite ehert Prof. Roberta Oberti, Universität von Pavia aus Italien, für seine Beiträge zur Kristallchemie der Amphibole.

Author (Name, Year)

Frank C. Hawthorne et al., 2010

References

Frank C. Hawthorne, Neil A. Ball, and Gerald K. Czamanske: FERRO-OBERTIITE, Na Na2 (Fe2+ 3 Fe3+Ti) Si8 O22O2, A NEW MINERAL SPECIES OF THE AMPHIBOLE GROUP FROM COYOTE PEAK, HUMBOLDT COUNTY, CALIFORNIA. Can Mineral 48 (2010) S. 301-306.

IMA-WEB-Seite, Neue Mineralien Aug 2009

IMA group assignments

Other languages

German

Ferro-Ferri-Obertiit

English

Ferro-ferri-obertiite

Russian

Ферроферриобертиит

old name

German

Ferro-Obertiit (1997)

English

Ferro-Obertiite (1997)

Spanish

Ferrroobertiita

Alternative Name

Ferro-obertiite

CNMNC (IMA)-Number

IMA 2009-034

CNMNC symbol

Symbol

Ffob

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

German pages

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English pages

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Russian pages

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