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Foitite (Foitit)

Pictures (8 Images total)

Foitit als blaue bis farblose xx mit Schörl xx
Views (File:
1175276065
): 2945
Foitit als blaue bis farblose xx mit Schörl xx
Fundort: San Piero in Campo, Elba, Italien; Bildbreite: 8 mm
Copyright: loismin; Contribution: loismin
Location: Italien/Toskana (Toscana)/Livorno, Provinz/Elba, Insel/Campo nell'Elba/San Piero in Campo
Mineral: Foitite
Image: 1175276065
Rating: 7.33 (votes: 3)
License: Usage for Mineralienatlas project only
Foitit als blaue bis farblose xx mit Schörl xx

Fundort: San Piero in Campo, Elba, Italien; Bildbreite: 8 mm
Copyright: loismin
Contribution: loismin 2007-03-30
Locality: San Piero in Campo / Campo nell'Elba / Elba, Insel / Livorno, Provinz / Toskana (Toscana) / Italien
Foitit
Views (File:
1275217471
): 2009
Foitit
Kristallgröße: 0,8 mm, Fundort: Gang Rosina, San Piero in Campo, Campo nell'Elba, Insel Elba, Livorno
Copyright: Enrico Bonacina; Contribution: thdun5
Collection: Domenico Preite
Location: Italien/Toskana (Toscana)/Livorno, Provinz/Elba, Insel/Campo nell'Elba/San Piero in Campo/Gang Rosina (Filone Rosina)
Mineral: Foitite
Image: 1275217471
Rating: 7 (votes: 2)
License: Usage for Mineralienatlas project only
Foitit

Kristallgröße: 0,8 mm, Fundort: Gang Rosina, San Piero in Campo, Campo nell'Elba, Insel Elba, Livorno
Collection: Domenico Preite
Copyright: Enrico Bonacina
Contribution: thdun5 2010-05-30
Locality: Gang Rosina (Filone Rosina) / San Piero in Campo / Campo nell'Elba / Elba, Insel / Livorno, Provinz / Toskana (Toscana) / Italien
Foitit
Views (File:
1257872513
): 1740
Foitit
Foitit auf Feldspat. Größe: 16,2 x 9,4 x 8 cm, Fundort: Erongo, Namibia.
Copyright: Rob Lavinsky; Contribution: thdun5
Location: Namibia/Erongo, Region/Omaruru, Kreis/Erongogebirge
Mineral: Foitite
Image: 1257872513
Rating: 6 (votes: 1)
License: Usage for Mineralienatlas project only
Foitit

Foitit auf Feldspat. Größe: 16,2 x 9,4 x 8 cm, Fundort: Erongo, Namibia.
Copyright: Rob Lavinsky
Contribution: thdun5 2009-11-10
Locality: Erongogebirge / Omaruru, Kreis / Erongo, Region / Namibia
Foitit
Views (File:
1253718683
): 2268
Foitit
Bildbreite: 2,5 mm; Fundort: Gang Rosina, San Piero in Campo, Campo nell'Elba, Insel Elba, Livorno, Toskana (Toscana), Italien
Copyright: Stephan Wolfsried; Contribution: Hg
Location: Italien/Toskana (Toscana)/Livorno, Provinz/Elba, Insel/Campo nell'Elba/San Piero in Campo/Gang Rosina (Filone Rosina)
Mineral: Foitite
Image: 1253718683
License: Usage for Mineralienatlas project only
Foitit

Bildbreite: 2,5 mm; Fundort: Gang Rosina, San Piero in Campo, Campo nell'Elba, Insel Elba, Livorno, Toskana (Toscana), Italien
Copyright: Stephan Wolfsried
Contribution: Hg 2009-09-23
Locality: Gang Rosina (Filone Rosina) / San Piero in Campo / Campo nell'Elba / Elba, Insel / Livorno, Provinz / Toskana (Toscana) / Italien
Foitit
Views (File:
1257872434
): 2089
Foitit
Bildbreite: ca. 4 cm, Fundort: Erongo, Namibia.
Copyright: Rob Lavinsky; Contribution: thdun5
Location: Namibia/Erongo, Region/Omaruru, Kreis/Erongogebirge
Mineral: Foitite
Image: 1257872434
License: Usage for Mineralienatlas project only
Foitit

Bildbreite: ca. 4 cm, Fundort: Erongo, Namibia.
Copyright: Rob Lavinsky
Contribution: thdun5 2009-11-10
Locality: Erongogebirge / Omaruru, Kreis / Erongo, Region / Namibia
Foitit
Views (File:
1263975007
): 922
Foitit
Größe: 19x17x12 mm; Fundort: Mt Mica Quarry, Paris, Oxford Co., Maine, USA
Copyright: Rob Lavinsky; Contribution: slugslayer
Location: USA/Maine/Oxford Co./Paris/Mt. Mica Quarry
Mineral: Foitite
Image: 1263975007
License: Usage for Mineralienatlas project only
Foitit

Größe: 19x17x12 mm; Fundort: Mt Mica Quarry, Paris, Oxford Co., Maine, USA
Copyright: Rob Lavinsky
Contribution: slugslayer 2010-01-20
Locality: Mt. Mica Quarry / Paris / Oxford Co. / Maine / USA

You find additional Foitit specimen at the Geolitho Museum

Collectors Summary

Color bläulichschwarz
Streak color grauweiß
Hardness (Mohs) 7
Cleavages keine
Fracture unregelmäßig
Crystal System trigonal, R3m

Chemism

Chemical formula

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

Chemical composition

Aluminium, Eisen, Lithium, Mangan, Natrium, Silicium, Bor, Sauerstoff, Wasserstoff

Unit weight: 1008.29707165 u; Number of atoms in the formula: 53.5

Info

Empirical formula:

Na0.5(Fe0.55Al0.3Mn0.1Li0.05)3Al6[(OH)4(BO3)3Si6O18]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.40

4

7.48

1.0079470

4.0317880
Lithium

Li

0.10

0.15

0.28

6.9412000

1.0411800
Boron

B

3.22

3

5.61

10.8117000

32.4351000
Oxygen

O

49.19

31

57.94

15.9994300

495.9823300
Sodium

Na

1.14

0.5

0.93

22.9897702

11.4948851
Aluminium

Al

18.46

6.9

12.90

26.9815382

186.1726136
Silicon

Si

16.71

6

11.21

28.0855300

168.5131800
Manganese

Mn

1.63

0.3

0.56

54.9380499

16.4814150
Iron

Fe

9.14

1.65

3.08

55.8452000

92.1445800

Analysis wt%

SiO2 : 35.90, Al2O3 : 34.90, FeO : 11.45, MnO : 1.71, Na2O : 0.75, Li2O : 0.31, B2O3 : 10.37, H2O : 3.56 (Ref: American Mineralogist 93)

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.19-040

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

Classification by Hölzel

9.CE.500

9: SILICATES
C: Cyclosilicates
E: Tourmaline-Group

Dana 8th edition

61.03a.01.01

61: Cyclosilicates Cyclosilicate Six-Membered Rings
03a: Cyclosilicates Cyclosilicate Six-Membered Rings with borate groups (Alkali-Deficient Tourmaline Subgroup)
01: Foitite Subgroup

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

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

Optical Properties

Color

bläulichschwarz

Streak color

grauweiß

max. Birefringence

0.022
Birefringence chart\! Foitite title=Birefringence chart Foitite

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

1.664

RI value γ / ε

1.642

Ri mean

1.657

2V angle

Uniaxial (-)

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

160

Space Group

R3m

Cell parameters a (Å)

15.967

Cell parameters b (Å)

-

Cell parameters c (Å)

7.126

Cell parameters a/b or c/a

0.446

Cell parameters c/b

-

Z

3

Volumne (ų)

1573.342

X-Ray Powder Diffraction

6.34(80),
4.212(50),
3.989(40),
3.452(90),
2.944(70),
2.573(100),
2.038(30),
1.268(20)
XRD chart Foitite

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)

7

VHN (Hardness Vickers)

1300 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.17 (gemessen)

3.192 ( ρ calc. Mineralienatlas )

Cleavages

keine

Fracture

unregelmäßig

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

USA/Kalifornien (California)

Preface

Author (Name, Year)

MacDonald & Hawthorne & Grice, 1993

References

American Mineralogist 78 (1993), 1299

IMA group assignments

Other languages

German

Foitit

Spanish

Foitita

English

Foitite

French

Foitite

Russian

Фойтит

Japanese

ﾎｲﾄ電気石

Alternative Name

Japanese

フォイト電気石

CNMNC (IMA)-Number

IMA 1992-034

CNMNC symbol

Symbol

Foi

Locations with GPS information