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Megakalsilite

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 6
Cleavages keine
Fracture muschelig
Crystal System hexagonal, P63

Chemism

Chemical formula

K[AlSiO4]

Chemical composition

Aluminium, Silicium, Kalium, Sauerstoff

Unit weight: 158.1630982 u; Number of atoms in the formula: 7

Info

Empirical formula:

K[AlSiO4]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

40.46

4

57.14

15.9994300

63.9977200
Aluminium

Al

17.06

1

14.29

26.9815382

26.9815382
Silicon

Si

17.76

1

14.29

28.0855300

28.0855300
Potassium

K

24.72

1

14.29

39.0983100

39.0983100

Analysis wt%

SiO2 : 37.96, Al2O3 : 32.38, K2O : 29.73 (Ref: Canadian Mineralogist 2002)

Strunz 9th edition incl. updates

9.FA.05

9: Silikate (Germanate)
F: Gerüstsilikate (Tektosilikate) ohne zeolithisches H2O
A: Gerüstsilikate (Tektosilicates) ohne weitere [Anionen]
05:Nephelin-Gruppe

Lapis Classification

VIII/J.02-025

VIII: SILIKATE
J: Gerüstsilikate (mit Zeolithen)
2: Ohne tetraederfremde Anionen

Classification by Hölzel

9.FA.225

9: SILICATES
F: Tektosilicates
A: Without other tetrahedral Anions

Dana 8th edition

76.02.01.07

76: Tektosilicates Tectosilicate Al-Si Framework
02: Tektosilicates Tectosilicate Al-Si Framework Feldspathoids and related species
01: Nepheline group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

max. Birefringence

0.007
Birefringence chart\! Megakalsilite title=Birefringence chart Megakalsilite

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

1.538

RI value γ / ε

1.531

Ri mean

1.536

2V angle

Uniaxial (-)

Optical Data Luminescence

Color LW-UV (365nm)

  

grünlich weiß

LW-UV Intensity

schwach

Color SW-UV (254nm)

  

grünlich weiß

SW-UV Intensity

schwach

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

hexagonal

Class (H-M)

6

Space Group number

173

Space Group

P63

Cell parameters a (Å)

18.111

Cell parameters b (Å)

-

Cell parameters c (Å)

8.462

Cell parameters a/b or c/a

0.467

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

24

Volume (ų)

2403.746

X-Ray Powder Diffraction

3.18(50),
3.091(100),
2.612(70),
1.674(50),
1.585(50),
1.516(50),
1.240(60),
1.204(50)
XRD chart Megakalsilite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

6

VHN (Hardness Vickers)

730 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.58 (gemessen)

2.622 ( ρ calc. Mineralienatlas )

Cleavages

keine

Fracture

muschelig

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Chibiny (Khibiny)/Berg Koashva/Koashva Grube

Preface

Author (Name, Year)

Khomyakov & Nechelyustov & Sokolova & Bonaccorsi & Merlino & Pasero, 2

References

Canadian Mineralogist 40 (2002), 961

Other languages

German

Megakalsilit

Spanish

Megakalsilita

French

Megakalsilite

English

Megakalsilite

Russian

Мегакальсилит

Traditional Chinese

梅鉀霞石

Simplified Chinese

梅钾霞石

CNMNC (IMA)-Number

IMA 2001-008

CNMNC symbol

Symbol

Mks

Locations with GPS information

IDs

GUSID (Global unique identifier short form) Ybt4RTBckUyppeGMqT1HuA
GUID (Global unique identifier) 4578BB61-5C30-4C91-A9A5-E18CA93D47B8
Database ID 2445