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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: slugslayer 2006-07-25
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

Volumne (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

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

German pages

 DeWikiPedia - search for: Feruvit
Google-Bilder-Suche - search for: Feruvit
Mineralienatlas.de (Forum) - search for: Feruvit

English pages

 Mindat - search for: Feruvite
Webmineral - search for:Feruvite
Handbook-of-Mineralogy - search for: Feruvite
RRUFF - Raman, XRD and other mineral data - search for: Feruvite
RRUFF - References and PDF downloads - search for: Feruvite
American-Mineralogist-Crystal-Structure-Database - search for: Feruvite
Strahlen.org - search for: Feruvite

Russian pages

 Webmineral.ru - search for: Ферувит

Mineral Dealer

German pages

 hausen - Mineralgroßhandel - search for: Feruvit
Crystal-Treasure.com - search for: Feruvit
Bosse - search for: Feruvit
Edelsteine Neuburg - Gundolf Fischer - search for: Feruvit

Locations with GPS information