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Oxy-foitite

Collectors Summary

Color schwarz
Streak color grau
Lustre Glasglanz
Hardness (Mohs) ~7
Fracture submuschelig
Crystal System trigonal, R3m

Chemism

Chemical formula

☐(Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3O

Additional chem. information

(☐0.53Na0.45Ca0.01K0.01)Σ1.00Y(Al1.53Fe2+1.16Mg0.22Mn2+0.05Zn0.01Ti4+0.03)Σ3.00Z(Al5.47Fe3+0.14Mg0.39)Σ6.00 [(Si5.89Al0.11)Σ6.00O18] (BO3)3V(OH)3W [O0.57F0.04(OH)0.39]Σ1.00

Oxy-Foitit gehört zur X-Site der vakanten Gruppe der Turmalin-Supergroup-Mineralien und zeigt chemische Beziehungen mit Foitit durch die Substitution YAl3+ + WO2-→YFe2+ +W(OH)1−

Chemical composition

Aluminium, Eisen, Silicium, Bor, Sauerstoff, Wasserstoff, Vakanz

Unit weight: 971.65195661 u; Number of atoms in the formula: 53

Info

Empirical formula:

Vc(FeAl2)Al6(Si6O18)(BO3)3(OH)3O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Vacancy

Vc

0.00

1

1.89

0.0000000

0.0000000
Hydrogen

H

0.31

3

5.66

1.0079470

3.0238410
Boron

B

3.34

3

5.66

10.8117000

32.4351000
Oxygen

O

51.05

31

58.49

15.9994300

495.9823300
Aluminium

Al

22.21

8

15.09

26.9815382

215.8523056
Silicon

Si

17.34

6

11.32

28.0855300

168.5131800
Iron

Fe

5.75

1

1.89

55.8452000

55.8452000

Strunz 9th edition incl. updates

9.CK.05

9: Silikate (Germanate)
C: Ringsilikate (Cyclosilikate)
K: ~[Si6O18]12- sechser-Einfachringe, mit inselartig, komplexe [Anionen]
05:

Lapis Classification

VIII/E.19-038

VIII: SILIKATE
E: Ringsilikate
19: Sechserringe [Si6O18] 12-; Turmalin-Gruppe

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Tourmaline supergroup  ⇒ X-vacant-Tourmaline group  ⇒ Tourmaline Vacant-subgroup 1

Optical Properties

Color

schwarz

Streak color

grau

Lustre

Glasglanz

2V angle

Uniaxial (-)

Pleochroism

O = dunkelbraun und E = blass braun

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

160

Space Group

R3m

Cell parameters a (Å)

15.9391(7)

Cell parameters b (Å)

-

Cell parameters c (Å)

7.1515(4)

Cell parameters a/b or c/a

0.449

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

3

Volume (ų)

1573.459

Crystal structure

Struktur bestimmt, Turmalin-Supergruppe

X-Ray Powder Diffraction

6.357(51),
4.220(47),
3.990(49),
3.466(100),
2.953(87),
2.579(98),
2.048(30),
2.041(50)
XRD chart Oxy-foitite

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

Physical Properties

Hardness (Mohs)

~7

Density (g/cm³)

3.143 (berechnet)

3.076 ( ρ calc. Mineralienatlas )

Fracture

submuschelig

(Co-)Type locality

(Co-)Type locality

Australien/New South Wales/Cooma/Cooma metamorphic Complex

Type material

Museum of Earth Sciences, Department of Earth Sciences, Sapienza University, P.le A. Moro 5, 00185 Rom, Italien

Collection number of type material

8829/84

Paragenesis of type material

Muskovit, K-Feldspat und Quarz

Preface

Author (Name, Year)

Ferdinando Bosi, Henrik Skogby and Ulf Hålenius (2016)

References

Bosi, F., Skogby, H. and Hålenius, U. (2016) Oxy-foitite, IMA 2016-069. CNMNC Newsletter No. 34, December 2016, page 1317; Mineralogical Magazine, 80, 1315–1321

Ferdinando Bosi, Henrik Skogby, Ulf Hålenius - Oxy-foitite, □(Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup - European Journal of Mineralogy - First Published on February 16, 2017 DOI: 10.1127/ejm/2017/0029-2631

IMA group assignments

 
Tourmaline supergroup
 
trigonal
R3m

 
 
X-vacant-Tourmaline group
 
 
 

 
 
 
Tourmaline Vacant-subgroup 1
 
 
 

 
 
 
 
Foitite
Na0.5(Fe2+,Al,Mn2+,Li)3Al6[(OH)4|(BO3)3|Si6O18]
trigonal
R3m

 
 
 
 
Magnesiofoitite
Na<0.5(Mg,Fe2+,Al)3Al6[(OH)4|(BO3)3|Si6O18]
trigonal
R3m

 
 
 
 
Oxy-foitite
☐(Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3O
trigonal
R3m

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Actuality: 16. May 2025 - 04:45:33

Other languages

German

Oxy-Foitit

English

Oxy-foitite

Russian

Оксифойтит

CNMNC (IMA)-Number

IMA 2016-069

CNMNC symbol

Symbol

Ofoi

Locations with GPS information

IDs

GUSID (Global unique identifier short form) ljbMGiOGikq4iogFdKp9Rw
GUID (Global unique identifier) 1ACC3696-8623-4A8A-B88A-880574AA7D47
Database ID 8268