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Potassic-pargasite

Collectors Summary

Color schwarz
Streak color bräunlich grün
Hardness (Mohs) 6.25
Cleavages vollkommen {110}
Fracture muschelig bis uneben
Crystal System monoklin, C2/m

Chemism

Chem­ical formula

(K,Na)Ca2(Mg,Fe2+)4Al(Si6Al2)O22(OH)2

Chem­ical com­po­si­tion

Aluminium, Calcium, Eisen, Magnesium, Natrium, Silicium, Kalium, Sauerstoff, Wasserstoff

Unit weight: 879.44836365 u; Number of atoms in the formula: 42

Info

Empirical formula:

(K0.75Na0.25)Ca2(Mg0.75Fe0.25)4Al(Si6Al2)O22(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.23

2

4.76

1.0079470

2.0158940

Oxygen

O

43.66

24

57.14

15.9994300

383.9863200

Sodium

Na

0.65

0.25

0.60

22.9897702

5.7474426

Magnesium

Mg

8.29

3

7.14

24.3050600

72.9151800

Aluminium

Al

9.20

3

7.14

26.9815382

80.9446146

Silicon

Si

19.16

6

14.29

28.0855300

168.5131800

Potassium

K

3.33

0.75

1.79

39.0983100

29.3237325

Calcium

Ca

9.11

2

4.76

40.0784000

80.1568000

Iron

Fe

6.35

1

2.38

55.8452000

55.8452000

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.10-125

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

Clas­sifica­tion by Hölzel

9.DH.310

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

IMA sta­tus

Anerkannt von der CNMNC

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

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

Optical Properties

Color

schwarz

Streak color

bräunlich grün

Diaphane­ity (Trans­parency)

durchscheinend bis opak

max. Birefrin­gence

0.016

Birefringence chart\! Potassic-pargasite title=Birefringence chart Potassic-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

1.654

RI value β

1.664

RI value γ / ε

1.670

Ri mean

1.663

2V angle

Biaxial (-) 79°

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell param­e­ters a (Å)

9.920

Cell param­e­ters b (Å)

18.059

Cell param­e­ters c (Å)

5.318

Cell param­e­ters a/b or c/a

0.549

Cell param­e­ters c/b

0.294

Cell param­e­ters α

90°

Cell param­e­ters β

105.37

Cell param­e­ters γ

90°

Z

2

Volumne (ų)

918.621

X-Ray Pow­der Diffrac­tion

8.45(90),
3.283(40),
3.140(100),
2.941(20),
2.707(30),
2.344(70),
2.018(30),
1.652(40)

XRD chart Potassic-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)

6.25

VHN (Hard­ness Vick­ers)

850 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.25

3.179 ( ρ calc. Mineralienatlas )

Cleav­ages

vollkommen {110}

Frac­ture

muschelig bis uneben

Tenac­ity

spröde

Preface

Author (Name, Year)

Robinson & Grice & Gault & Lalonde, 1997

References

Canadian Mineralogist 35 (1997), 1535

IMA group assignments

Other languages

German

Kalium-Pargasit

Spanish

Potasio-pargasita

French

Potassic-pargasite

English

Potassic-pargasite

Russian

Калийпаргасит

Traditional Chinese

鉀韭閃石

Simplified Chinese

钾韭闪石

Japanese

カリパーガス閃石

Alternative Name

German

Kaliumpargasit

Spanish

Potassicpargasita

CNMNC (IMA)-Number

IMA 1994-046

CNMNC symbol

Symbol

Pprg

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Kalium-Pargasit
Google-Bilder-Suche - search for: Kalium-Pargasit
Mineralienatlas.de (Forum) - search for: Kalium-Pargasit

English pages

Mindat - search for: Potassic-pargasite
Webmineral - search for:Potassic-pargasite
Handbook-of-Mineralogy - search for: Potassic-pargasite
RRUFF - Raman, XRD and other mineral data - search for: Potassic-pargasite
RRUFF - References and PDF downloads - search for: Potassic-pargasite
American-Mineralogist-Crystal-Structure-Database - search for: Potassic-pargasite
Strahlen.org - search for: Potassic-pargasite

Russian pages

Webmineral.ru - search for: Калийпаргасит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Kalium-Pargasit
Crystal-Treasure.com - search for: Kalium-Pargasit
Bosse - search for: Kalium-Pargasit
Edelsteine Neuburg - Gundolf Fischer - search for: Kalium-Pargasit

Locations with GPS information