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Fluoro-pedrizite (Фторпедрицит)

Collectors Summary

Color blass-blau
Streak color weiß
Hardness (Mohs) 5.5
Cleavages vollkommen (110), teilbat (100)(001)
Crystal System monoklin, C2/m

Additional information / Summary

Fluor-Pedrizit wurde ursprünglich aus dem Material des Holotypus von Klino-Holmquistit durch Oberti et. al 2005 (IMA 2004-002) beschrieben als Fluoro-sodicpedrizite.

Eingehende Analysen zeigten, dass die Probe aus einer Mischung von zwei verschiedenen Zusammensetzungen von Amphibol, Tremolite und einem neuen Amphibol-Endglied dem Fluor-Natrium-Pedrizit bestand.

Chemism

Chemical formula

NaLi2(Mg2Al2Li)Si8O22F2

Additional chem. information

Amphibol-Gruppe

Chemical composition

Aluminium, Lithium, Magnesium, Natrium, Silicium, Fluor, Sauerstoff

Unit weight: 761.0550731 u; Number of atoms in the formula: 40

Info

Empirical formula:

NaLi2(Mg2Al2Li)Si8O22F2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Lithium

Li

2.74

3

7.50

6.9412000

20.8236000

Oxygen

O

46.25

22

55.00

15.9994300

351.9874600

Fluorine

F

4.99

2

5.00

18.9984033

37.9968065

Sodium

Na

3.02

1

2.50

22.9897702

22.9897702

Magnesium

Mg

6.39

2

5.00

24.3050600

48.6101200

Aluminium

Al

7.09

2

5.00

26.9815382

53.9630764

Silicon

Si

29.52

8

20.00

28.0855300

224.6842400

Strunz 9th edition incl. updates

9.DE.25

9: Silikate (Germanate)
D: Ketten- und Bandsilikate (Inosilikate)
E: Ketten- und Bandsilikate mit 2-periodischen Doppelketten, Si4O11; Amphibol-Familie, Klinoamphibole
25:Amphibole: Alkali

Lapis Classification

VIII/F.08-085

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

Classification by Hölzel

9.DF.450

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

IMA status

anerkannt 2004, umbenannt anerkannt 2012

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Amphibole supergroup  ⇒ (OH,F,Cl)-dominant amphiboles  ⇒ Lithium amphiboles  ⇒ Pedrizite (Ped) amphiboles

Optical Properties

Color

blass-blau

Streak color

weiß

max. Birefringence

0.023

Birefringence chart\! Fluoro-pedrizite title=Birefringence chart Fluoro-pedrizite

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

1.610

RI value β

1.627

RI value γ / ε

1.633

Ri mean

1.623

2V angle

Biaxial (-) 58° (gemessen) 61° (berechnet)

Pleochroism

schwach, farblos zu hellbraun

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell parameters a (Å)

9.368

Cell parameters b (Å)

17.616

Cell parameters c (Å)

5.271

Cell parameters a/b or c/a

0.532

Cell parameters c/b

0.299

Cell parameters α

90°

Cell parameters β

102.38

Cell parameters γ

90°

Z

2

Volume (ų)

849.629

X-Ray Powder Diffraction

8.12(70), 4.404(70), 3.375(50), 3.005(80), 2.873(30), 2.679(100), 2.483(50), 2.133(30)

XRD chart Fluoro-pedrizite

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)

5.5

VHN (Hardness Vickers)

530 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3 (gemessen) 3.05 (berechnet)

2.975 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen (110), teilbat (100)(001)

Tenacity

spröde

Preface

Name from

als Mitglied der Predrizit-Gruppe

References

American Mineralogist 90 (2005), 732

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

IMA group assignments

Other languages

German

Fluoro-Pedrizit

English

Fluoro-pedrizite

Russian

Фторнатропедрисит

Russian

Фторпедрицит

old name

German

Fluor-Natriumpedrizit (2005)

English

Fluoro-sodicpedrizite (2005)

Alternative Name

German

Fluoronatriumpedrizit

German

Fluoropedrizit

Lapis-Mineralienverzeichnis

CNMNC (IMA)-Number

IMA 2004-002

CNMNC symbol

Symbol

Flpd

Locations with GPS information

IDs

GUSID (Global unique identifier short form) mRS1_mv-YUa7TpUIDd-YfQ
GUID (Global unique identifier) FEB51499-FE6B-4661-BB4E-95080DDF987D
Database ID 4329