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Ferri-winchite (Ferriwinchit)

Collectors Summary

Color schwarz
Hardness (Mohs) 5.5
Cleavages gut (110)
Fracture hakig

Chemism

Chemical formula

(☐,Na)(Na,Ca)2(Mg,Fe2+)4Fe3+[Si8O22](OH)2

Additional chem. information

Amphibol Gruppe

Chemical composition

Calcium, Eisen, Magnesium, Natrium, Silicium, Sauerstoff, Wasserstoff, Vakanz

Unit weight: 855.5633318575 u; Number of atoms in the formula: 42

Info

Empirical formula:

(Vc0.75Na0.25)(Na0.75Ca0.25)2(Mg0.75Fe0.25)4Fe[Si8O22](OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Vacancy

Vc

0.00

0.75

1.79

0.0000000

0.0000000
Hydrogen

H

0.24

2

4.76

1.0079470

2.0158940
Oxygen

O

44.88

24

57.14

15.9994300

383.9863200
Sodium

Na

4.70

1.75

4.17

22.9897702

40.2320979
Magnesium

Mg

8.52

3

7.14

24.3050600

72.9151800
Silicon

Si

26.26

8

19.05

28.0855300

224.6842400
Calcium

Ca

2.34

0.5

1.19

40.0784000

20.0392000
Iron

Fe

13.05

2

4.76

55.8452000

111.6904000

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.09-105

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

Classification by Hölzel

9.DI.210

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

Dana 8th edition

66.01.03a.21

66: Inosilicates Inosilicate Double-Width Unbranched Chains, W=2
01: Inosilicates Inosilicate Double-Width Unbranched Chains, W=2 with P=2 amphibole configuration
03a: Group 2, the calcic amphiboles

IMA status

anerkannt 2004

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Amphibole supergroup  ⇒ (OH,F,Cl)-dominant amphiboles  ⇒ Sodium-calcium amphiboles  ⇒ Winchite (Win) amphiboles

Optical Properties

Color

schwarz

max. Birefringence

0.015
Birefringence chart\! Ferri-winchite title=Birefringence chart Ferri-winchite

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

1.670

RI value β

1.680

RI value γ / ε

1.685

Ri mean

1.678

2V angle

Biaxial (-) 75°

Crystallography

Cell parameters a (Å)

9.811

Cell parameters b (Å)

18.014

Cell parameters c (Å)

5.295

Cell parameters a/b or c/a

0.545

Cell parameters c/b

0.294

Cell parameters α

90°

Cell parameters β

104.10

Cell parameters γ

90°

Z

2

Volumne (ų)

907.6

X-Ray Powder Diffraction

8.42(100), 3.391(10), 3.268(13), 3.116(60), 2.800(10), 2.711(20)
XRD chart Ferri-winchite

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

Physical Properties

Hardness (Mohs)

5.5

VHN (Hardness Vickers)

530 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.14

3.13 ( ρ calc. Mineralienatlas )

Cleavages

gut (110)

Fracture

hakig

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Russland/Ural, Föderationskreis/Tscheljabinsk, Oblast/Ilmen-Gebirge/Ilmenogorsky-Komplex

IMA group assignments

Other languages

German

Ferri-Winchit

English

Ferri-winchite

Spanish

Ferriwinchita

French

Ferriwinchite

Russian

Ферривинчит

Traditional Chinese

高鐵藍透閃石

Simplified Chinese

高铁蓝透闪石

Alternative Name

German

Ferriwinchit

Lapis-Mineralienverzeichnis

CNMNC (IMA)-Number

IMA 2004-034

CNMNC symbol

Symbol

Fwnc

Locations with GPS information