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Proto-ferro-anthophyllite (Proto-Ferro-Anthophyllit)

Additional Functions

Collectors Summary

Color hellgelb, bräunlichgelb
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 5 - 6
Cleavages vollkommen
Crystal System orthorhombisch, Pnmn

Chemism

Chemical formula

(Fe2+,Mn2+)2Fe52+[Oh|Si4O11]2

Chemical composition

Eisen, Mangan, Silicium, Sauerstoff

Unit weight: 999.13338495 u; Number of atoms in the formula: 39

Info

Empirical formula:

(Fe0.75Mn0.25)2Fe5[OhSi4O11]2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

38.43

24

61.54

15.9994300

383.9863200

Silicon

Si

22.49

8

20.51

28.0855300

224.6842400

Manganese

Mn

2.75

0.5

1.28

54.9380499

27.4690250

Iron

Fe

36.33

6.5

16.67

55.8452000

362.9938000

Analysis wt%

SiO2 : 46.27, FeO : 46.39, MnO : 2.51, H2O : 1.80 (Ref: PCM98)

Strunz 9th edition incl. updates

9.DD.05

9: Silikate (Germanate)
D: Ketten- und Bandsilikate (Inosilikate)
D: Ketten- und Bandsilikate mit 2-periodischen Doppelketten, Si4O11; Amphibol-Familie, Orthoamphibole
05:Amphibole: Ortho

Lapis Classification

VIII/F.12-150

VIII: SILIKATE
F: Ketten- und Bandsilikate
12: Zweierbänder [Si4O11] 6-; Amphibol-Gruppe; Orthorhombische Amphibole

Classification by Hölzel

9.DF.140

9: SILICATES
D: Inosilicates; ~[Si2O6]4--...2-Chain
F: Amphiboles; Orthorhombic Amphiboles
1: Anthophyllite-Group

Dana 8th edition

66.01.02.03a

66: Inosilicates Inosilicate Double-Width Unbranched Chains, W=2
01: Inosilicates Inosilicate Double-Width Unbranched Chains, W=2 with P=2 amphibole configuration

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Amphibole supergroup  ⇒ (OH,F,Cl)-dominant amphiboles  ⇒ Magnesium-iron-manganese amphiboles  ⇒ Anthophyllite (Ath) amphiboles

Optical Properties

Color

hellgelb, bräunlichgelb

Streak color

weiß

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz

max. Birefringence

0.036

Birefringence chart\! Proto-ferro-anthophyllite title=Birefringence chart Proto-ferro-anthophyllite

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

1.69

RI value β

1.71

RI value γ / ε

1.726

Ri mean

1.709

2V angle

Biaxial (-) 87° (gemessen) 83.6 (berechnet)

Orientation

X = a, Y = b, Z = c

Pleochroism

schwach, Schattierungen von blaßgelb

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

58

Space Group

Pnmn

Cell parameters a (Å)

9.382

Cell parameters b (Å)

18.390

Cell parameters c (Å)

5.343

Cell parameters a/b or c/a

0.510

Cell parameters c/b

0.291

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

2

Volume (ų)

921.854

X-Ray Powder Diffraction

8.353(100),
3.277(30),
3.074(60),
2.879(30),
2.761(20),
2.560(90),
2.317(30),
1.535(30)

XRD chart Proto-ferro-anthophyllite

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)

5 - 6

Density (g/cm³)

3.599 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen

Preface

Author (Name, Year)

Sueno & Matsuura, 1986

References

Journal of Mineralogical and Petrological Sciences (formerly Mineralogical Journal) 97 (2002), 127

Frank C. Hawthorne, Roberta Oberti, George E. Harlow, Walter V. Maresch, Robert F. Martin, John C. Schumacer, Mark D. Welch - Nomenclature of the amphibole supergroup, American Mineralogist, Volume 97 (2012), 2031–2048

IMA group assignments

Other languages

German

Proto-Ferro-Anthophyllit

English

Proto-ferro-anthophyllite

French

Protoferro-Anthophyllite

Spanish

Protoferroantofilita

Russian

Протоферроантофиллит

Alternative Name

English

Protoferro-anthophyllite

English

Protoferroanthophyllite

CNMNC (IMA)-Number

IMA 1986-006

CNMNC symbol

Symbol

Pfath

IDs

GUSID (Global unique identifier short form) URHDWRleJEKScbFskl2nUQ
GUID (Global unique identifier) 59C31151-5E19-4224-9271-B16C925DA751
Database ID 3137