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Fluoro-pargasite (Fluoropargasit)

Pictures (1 Images total)

Fluor-Pargasit
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Fluor-Pargasit
dunkelgrün-schwarzer Fluor-Pargasit neben Calcit, Pargas, Varsinais-Suomi, Finnland; BB ~ 4 cm, analysiert
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Finnland/Varsinais-Suomi, Landschaft/Pargas (Parainen)
Mineral: Fluoro-pargasite
Image: 1582647471
License: Usage for Mineralienatlas project only
Fluor-Pargasit

dunkelgrün-schwarzer Fluor-Pargasit neben Calcit, Pargas, Varsinais-Suomi, Finnland; BB 4 cm, analysiert
Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-02-25
Locality: Pargas (Parainen) / Varsinais-Suomi, Landschaft / Finnland

Collectors Summary

Color schwarz
Lustre Glasglanz
Hardness (Mohs) 6
Cleavages vollkommen (110)
Fracture muschelig
Crystal System monoklin, C2/m

Chemism

Chemical formula

NaCa2(Mg4Al)(Si6Al2)O22F2

Additional chem. information

A Position: Na
C Position: Mg als das dominante, divalente Kation und Al als das dominant, trivalente Kation.
W Position: F als das dominante Anion

Chemical composition

Aluminium, Calcium, Magnesium, Natrium, Silicium, Fluor, Sauerstoff

Unit weight: 839.8088713 u; Number of atoms in the formula: 40

Info

Empirical formula:

NaCa2(Mg4Al)(Si6Al2)O22F2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

41.91

22

55.00

15.9994300

351.9874600
Fluorine

F

4.52

2

5.00

18.9984033

37.9968065
Sodium

Na

2.74

1

2.50

22.9897702

22.9897702
Magnesium

Mg

11.58

4

10.00

24.3050600

97.2202400
Aluminium

Al

9.64

3

7.50

26.9815382

80.9446146
Silicon

Si

20.07

6

15.00

28.0855300

168.5131800
Calcium

Ca

9.54

2

5.00

40.0784000

80.1568000

Analysis wt%

SiO2 : 43.30, TiO2 : 0.90, Al2O3 : 12.11, FeO : 9.60, MgO : 14.44, CaO : 12.29, Na2O : 2.88, K2O : 0.91, F : 2.71, H2O : 0.72 (Ref: Canadian Mineralogist 2005)

Strunz 9th edition incl. updates

9.DE.15

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

Lapis Classification

VIII/F.10-115

VIII: SILIKATE
F: Ketten- und Bandsilikate
10: Zweierbänder [Si4O11] 6-; Amphibol-Gruppe; Ca2-Amphibole

Classification by Hölzel

9.DH.305

9: SILICATES
D: Inosilicates; ~[Si2O6]4--...2-Chain
H: Amphiboles; Calcic Amphiboles
3: Pargasite-Group

Dana 8th edition

66.01.03b.19

66: Inosilicates Inosilicate Double-Width Unbranched Chains, W=2
01: Inosilicates Inosilicate Double-Width Unbranched Chains, W=2 with P=2 amphibole configuration
03b: Group 3, the sodic-calcic amphiboles

IMA status

anerkannt 2003

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Amphibole supergroup  ⇒ (OH,F,Cl)-dominant amphiboles  ⇒ Calcium amphiboles  ⇒ Pargasite (Prg) amphiboles

Optical Properties

Color

schwarz

Diaphaneity (Transparency)

transparent bis durchscheinend in sehr dünnen Fragmenten

Lustre

Glasglanz

max. Birefringence

0.020
Birefringence chart\! Fluoro-pargasite title=Birefringence chart Fluoro-pargasite

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

1.634

RI value β

1.642

RI value γ / ε

1.654

Ri mean

1.643

2V angle

Biaxial (+) 68°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell parameters a (Å)

9.877

Cell parameters b (Å)

18.041

Cell parameters c (Å)

5.309

Cell parameters a/b or c/a

0.547

Cell parameters c/b

0.294

Cell parameters α

90°

Cell parameters β

105.13

Cell parameters γ

90°

Z

2

Volumne (ų)

913.223

Kristall structure

Maxwell C. Day; Frank C. Hawthorne; Umberto Susta; Giancarlo Della Ventura; George E. Harlow: Gem amphiboles from Mogok, Myanmar: crystal-structure refinement, infrared spectroscopy and short-range order–disorder in gem pargasite and fluoro-pargasite. Mineralogical Magazine September Vol.83, Nr. 3 (2019) S. 361-371.

X-Ray Powder Diffraction

8.42(100), 3.28(20), 3.21(84), 3.00(13), 2.825(54), 2.379(17), 2.347(15), 1.443(15)
XRD chart Fluoro-pargasite

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)

6

VHN (Hardness Vickers)

730 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.18 (3.19 berechnet)

3.054 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen (110)

Fracture

muschelig

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

USA/New York/Orange Co./Town of Warwick/Edenville

Preface

Author (Name, Year)

Lupulescu & Rakovan & Robinson & Hughes, 2005

References

Canadian Mineralogist 43 (2005), 1423

IMA group assignments

Other languages

German

Fluoro-Pargasit

English

Fluoro-pargasite

Russian

Фторпаргасит

Traditional Chinese

氟韭閃石

Simplified Chinese

氟韭闪石

Alternative Name

German

Fluoropargasit

English

Fluoropargasite

CNMNC (IMA)-Number

IMA 2003-050

CNMNC symbol

Symbol

Flprg

Locations with GPS information