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Franklinphilite

Collectors Summary

Color dunkelbraun, schwarz
Streak color hellbraun
Hardness (Mohs) 4
Cleavages unvollkommen {001}
Fracture keiner
Crystal System triklin,

Chemism

Chemical formula

(K,Na)1-x(Mn2+,Mg,Zn,Fe3+)8(Si,Al)12(O,OH)36·nH2O

Chemical composition

Aluminium, Eisen, Magnesium, Mangan, Natrium, Silicium, Zink, Kalium, Sauerstoff, Wasserstoff

Strunz 9th edition incl. updates

9.EG.40

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
G: Doppelnetze mit sechsfach-Ringen
40:Stilpnomelan-Gruppe

Lapis Classification

VIII/H.17-045

VIII: SILIKATE
H: Schichtsilikate
17: Glimmerartige Schicht-silikate mit Baugruppen [Si4O10] 4- und verwandte Strukturen;

Classification by Hölzel

9.EG.250

9: SILICATES
E: Phyllosilicates
G: Hydrated Micas
2: With Mn

Dana 8th edition

74.01.01.03

74: Phyllosilicates Phyllosilicate Modulated Layers
01: Phyllosilicates Phyllosilicate Modulated Layers with joined islands
01: Stilpnomelane group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

dunkelbraun, schwarz

Streak color

hellbraun

Diaphaneity (Transparency)

teilweise durchscheinend bis opak

max. Birefringence

0.038

Birefringence chart\! Franklinphilite title=Birefringence chart Franklinphilite

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

1.545

RI value β

1.583

RI value γ / ε

1.583

Ri mean

1.570

2V angle

Biaxial (-) 10°

Optical Data Luminescence

Luminescence

keine Fluoreszenz bekannt

Crystallography

Crystal System

triklin

Cell parameters a (Å)

5.521

Cell parameters b (Å)

9.560

Cell parameters c (Å)

36.57

Cell parameters a/b or c/a

0.578

Cell parameters c/b

3.825

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

6

Volumne (ų)

1671.596

X-Ray Powder Diffraction

12.3(100),
4.79(20),
4.08(20),
2.737(30),
2.583(40),
2.362(30),
1.594(30),
1.580(30)

XRD chart Franklinphilite

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

Physical Properties

Hardness (Mohs)

4

VHN (Hardness Vickers)

190 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.6 - 2.8 / Durchschnittlich = 2.7

Cleavages

unvollkommen {001}

Fracture

keiner

Tenacity

spröde

Preface

Author (Name, Year)

Dunn & Peacor & Su, 1992

References

Mineralogical Record 23 (1992), 465

Other languages

Spanish

Franklinfilita

German

Franklinphilit

English

Franklinphilite

French

Franklinphilite

Russian

Франклинфилит

Japanese

フランクリンフィライト

Alternative Name

Franklinphilita

CNMNC (IMA)-Number

IMA 1990-050

CNMNC symbol

Symbol

Fkp

Locations with GPS information