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Fluoro-taramite

Collectors Summary

Color bläulichgrün
Lustre Glasglanz
Cleavages undeutlich nach {110}
Crystal System monoklin, C2/m

Chemism

Chemical formula

Na(CaNa)(Mg3Al2)(Si6Al2)O22F2

Additional chem. information

A Position: Na dominant
C2+ Position: Mg dominant
C3+ Position: Al dominant
W Position: F dominant

Chemical composition

Aluminium, Calcium, Magnesium, Natrium, Silicium, Fluor, Sauerstoff

Unit weight: 825.3967197 u; Number of atoms in the formula: 40

Info

Empirical formula:

Na(CaNa)(Mg3Al2)(Si6Al2)O22F2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

42.64

22

55.00

15.9994300

351.9874600

Fluorine

F

4.60

2

5.00

18.9984033

37.9968065

Sodium

Na

5.57

2

5.00

22.9897702

45.9795404

Magnesium

Mg

8.83

3

7.50

24.3050600

72.9151800

Aluminium

Al

13.08

4

10.00

26.9815382

107.9261528

Silicon

Si

20.42

6

15.00

28.0855300

168.5131800

Calcium

Ca

4.86

1

2.50

40.0784000

40.0784000

Analysis wt%

SiO2 : 40.73, Al2O3 : 17.50, Fe2O3 : 6.12, FeO : 9.20, MgO : 9.66, CaO : 7.66, Na2O : 6.15, F : 2.22, H2O : 0.98 (Ref: American Mineralogist 2007)

Strunz 9th edition incl. updates

9.DE.20

9: Silikate (Germanate)
D: Ketten- und Bandsilikate (Inosilikate)
E: Ketten- und Bandsilikate mit 2-periodischen Doppelketten, Si4O11; Amphibol-Familie, Klinoamphibole
20:

Lapis Classification

VIII/F.09-060

VIII: SILIKATE
F: Ketten- und Bandsilikate
9: Zweierbänder [Si4O11] 6-; Amphibol-Gruppe; Na-Ca-Amphibole

Classification by Hölzel

9.DI.535

9: SILICATES
D: Inosilicates; ~[Si2O6]4--...2-Chain
I: Amphiboles; Sodiccalcic Amphiboles
5: Taramite-Group

IMA status

anerkannt Sep. 2006

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Amphibole supergroup  ⇒ (OH,F,Cl)-dominant amphiboles  ⇒ Sodium-calcium amphiboles  ⇒ Taramite (Tar) amphiboles

Optical Properties

Color

bläulichgrün

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz

max. Birefringence

0.013

Birefringence chart\! Fluoro-taramite title=Birefringence chart Fluoro-taramite

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

1.627

RI value β

1.635

RI value γ / ε

1.641

Ri mean

1.634

2V angle

Biaxial (-) 66° (gemessen) 81 (berechnet)

Orientation

Y = b, Z ^ c = 19°

Dispersion

extrem, r << v

Absorption

Z > Y > X

Pleochroism

X=farblos, Y=hellviolett, Z=blau

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell parameters a (Å)

9.7414

Cell parameters b (Å)

17.9095

Cell parameters c (Å)

5.3335

Cell parameters a/b or c/a

0.544

Cell parameters c/b

0.298

Cell parameters α

90°

Cell parameters β

104.672

Cell parameters γ

90°

Z

2

Volume (ų)

900.16

X-Ray Powder Diffraction

8.340(82), 3.384(47), 3.094(67), 2.700(100), 2.583(54), 2.551(64), 2.321(39), 2.153(35)

XRD chart Fluoro-taramite

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

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

3.26 berechnet

3.045 ( ρ calc. Mineralienatlas )

Cleavages

undeutlich nach {110}

Tenacity

spröde

References

Fluoronyböite from Jianchang (Su-Lu, China) and nyböite from Nybö (Nordfjord, Norway): a petrological and crystal-chemical comparison of these two high-pressure amphiboles - Mineralogical Magazine (August 2003) 67 No. 4, 769-782.

Mineralien Welt 04/08, Steffen Jahn, Die neuen Mineralien 2007 - 2008

Oberti, R., Boiocchi, M., Smith, D.C. & Medenbach, O. (2007): Alumotaramite, alumino-magnesiotaramite, and fluoro-alumino-magnesiotaramite: Mineral data and crystal chemistry. American Mineralogist. 92: 1428-1435

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

IMA group assignments

Other languages

German

Fluoro-Taramit

English

Fluoro-taramite

Russian

Фтортарамит

Alternative Name

German

Fluoro-Alumino-Magnesiotaramit

English

Fluoro-alumino-magnesiotaramite

Fluoro-magnesio-aluminotaramite

English

Fluoroaluminomagnesiotaramite

CNMNC (IMA)-Number

IMA 2006-025

CNMNC symbol

Symbol

Fltrm

Locations with GPS information

IDs

GUSID (Global unique identifier short form) d6P6qYHuLE6bO-UIHSyDig
GUID (Global unique identifier) A9FAA377-EE81-4E2C-9B3B-E5081D2C838A
Database ID 4371