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Feruvite

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Feruvit
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Feruvit
Braunschwarze, verzwillingte Feruvit-Kristalle; bis 2,1 cm Länge; Fundort: Anjanabonoina, Antsirabe, Madagaskar
Copyright: McSchuerf; Contribution: Philip Blümner
Location: Madagaskar/Vàkinankàratra, Region/Betafo, Distrikt/Ambohimanambola/Anjanabonoina-Pegmatit
Mineral: Feruvite
Image: 1153778497
Rating: 7 (votes: 1)
License: Usage for Mineralienatlas project only
Feruvit

Braunschwarze, verzwillingte Feruvit-Kristalle; bis 2,1 cm Länge; Fundort: Anjanabonoina, Antsirabe, Madagaskar
Copyright: McSchuerf
Contribution: Philip Blümner 2006-07-24
Locality: Anjanabonoina-Pegmatit / Ambohimanambola / Betafo, Distrikt / Vàkinankàratra, Region / Madagaskar

Collectors Summary

Color bräunlichschwarz, dunkelbraun, schwarz
Streak color grau
Lustre Glasglanz bis Matt
Hardness (Mohs) 7
Crystal System trigonal, R3m

Chemism

Chemical formula

(Ca,Na)(Fe,Mg,Ti)3(Al,Mg,Fe)6(BO3)3Si6O18(OH)4

Chemical composition

Aluminium, Calcium, Eisen, Magnesium, Natrium, Silicium, Titan, Bor, Sauerstoff, Wasserstoff

Unit weight: 1047.91445007 u; Number of atoms in the formula: 54

Info

Empirical formula:

(Ca0.75Na0.25)(Fe0.6Mg0.3Ti0.1)3(Al0.6Mg0.3Fe0.1)6(BO3)3Si6O18(OH)4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.38

4

7.41

1.0079470

4.0317880
Boron

B

3.10

3

5.56

10.8117000

32.4351000
Oxygen

O

47.33

31

57.41

15.9994300

495.9823300
Sodium

Na

0.55

0.25

0.46

22.9897702

5.7474426
Magnesium

Mg

6.26

2.7

5.00

24.3050600

65.6236620
Aluminium

Al

9.27

3.6

6.67

26.9815382

97.1335375
Silicon

Si

16.08

6

11.11

28.0855300

168.5131800
Calcium

Ca

2.87

0.75

1.39

40.0784000

30.0588000
Titanium

Ti

1.37

0.3

0.56

47.8671000

14.3601300
Iron

Fe

12.79

2.4

4.44

55.8452000

134.0284800

Analysis wt%

SiO2 : 33.33, TiO2 : 2.19, B2O3 : 9.93, Al2O3 : 23.38, Fe2O3 : 2.56, FeO : 11.26, MgO : 7.80, Na2O : 1.16, H2O : 3.80 (Ref: Canadian Mineralogist 89)

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.19-100

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

Classification by Hölzel

9.CE.410

9: SILICATES
C: Cyclosilicates
E: Tourmaline-Group
4: Calcic Tourmalines with V3 W = (OH)3 F or (OH)3 O

Dana 8th edition

61.03b.01.04

61: Cyclosilicates Cyclosilicate Six-Membered Rings
03b: Cyclosilicates Cyclosilicate Six-Membered Rings with borate groups (Calcic Tourmaline Subgroup)
01: Liddicoatite Subgroup

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Tourmaline supergroup  ⇒ Calcic-Tourmaline group  ⇒ Tourmaline Calcic-subgroup 1

Optical Properties

Color

bräunlichschwarz, dunkelbraun, schwarz

Streak color

grau

Diaphaneity (Transparency)

durchscheinend bis opak

Lustre

Glasglanz bis Matt

max. Birefringence

0.018
Birefringence chart\! Feruvite title=Birefringence chart Feruvite

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

1.687

RI value γ / ε

1.669

Ri mean

1.681

2V angle

Uniaxial (-)

Optical Data Luminescence

Luminescence

keine Fluoreszenz bekannt

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

160

Space Group

R3m

Cell parameters a (Å)

16.012

Cell parameters b (Å)

-

Cell parameters c (Å)

7.245

Cell parameters a/b or c/a

0.452

Cell parameters c/b

-

Z

3

Volume (ų)

1608.645

X-Ray Powder Diffraction

6.43(40),
4.24(60),
4.00(60),
3.50(60),
2.979(80),
2.586(100),
2.051(50),
1.928(40)
XRD chart Feruvite

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)

3.207

3.245 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Neuseeland/North Island/Waikato, Region/Repanga (Cuvier) Island

Preface

Associations

Quarz, Mikroklin, Chlorapatit, Pyrit

Author (Name, Year)

Grice & Robinson, 1989

References

Canadian Mineralogist 27 (1989), 199

IMA group assignments

Other languages

German

Feruvit

Spanish

Feruvita

English

Feruvite

French

Feruvite

Russian

Ферувит

Japanese

鉄灰電気石

CNMNC symbol

Symbol

Fuvt

Locations with GPS information

IDs

GUSID (Global unique identifier short form) Q1ABJqejzE2jd3dgomtljg
GUID (Global unique identifier) 26015043-A3A7-4DCC-A377-7760A26B658E
Database ID 1213