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Karlite (Karlit)

Collectors Summary

Color hellgrün, seidenweiß
Streak color weiß
Hardness (Mohs) 5.5
Solubility - verdünnte kalte HCl
Crystal System orthorhombisch, P21212

Chemism

Chemical formula

(Mg,Al)6(BO3)3(OH,Cl)4

Chemical composition

Aluminium, Chlor, Magnesium, Bor, Sauerstoff, Wasserstoff

Unit weight: 412.7503783 u; Number of atoms in the formula: 25

Info

Empirical formula:

(Mg0.75Al0.25)6(BO3)3((OH)0.75Cl0.25)4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.73

3

12.00

1.0079470

3.0238410
Boron

B

7.86

3

12.00

10.8117000

32.4351000
Oxygen

O

46.52

12

48.00

15.9994300

191.9931600
Magnesium

Mg

26.50

4.5

18.00

24.3050600

109.3727700
Aluminium

Al

9.81

1.5

6.00

26.9815382

40.4723073
Chlorine

Cl

8.59

1

4.00

35.4532000

35.4532000

Analysis wt%

B2O3 : 22.92, Al2O3 : 2.96, FeO : 2.27, MgO : 58.90, Cl : 3.26, H2O : 11.03 (Ref: American Mineralogist 81)

Strunz 9th edition incl. updates

6.AB.25

6: Borate
A: Monoborate
B: BO3 mit zusätzlichen Anionen; 1(Δ) + OH, etc.
25:Karlit-Gruppe

Lapis Classification

V/G.05-020

V: NITRATE, CARBONATE UND BORATE
G: Inselborate
5: [BO3] 3--Inseln

Classification by Hölzel

6.AB.270

6: Borates
A: Monoborates
B: BO3, with additional anions - 1(P)+OH, etc.
2: With Me~[6] cations

Dana 8th edition

25.08.04.01

25: Anhydrous Borates Containing Hydroxyl or Halogen
08: Anhydrous Borates Containing Hydroxyl or Halogen

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

hellgrün, seidenweiß

Streak color

weiß

Diaphaneity (Transparency)

transparent

max. Birefringence

0.045
Birefringence chart\! Karlite title=Birefringence chart Karlite

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

1.589

RI value β

1.632

RI value γ / ε

1.634

Ri mean

1.618

2V angle

Biaxial (-) 24°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

222

Space Group number

18

Space Group

P21212

Cell parameters a (Å)

17.929

Cell parameters b (Å)

17.600

Cell parameters c (Å)

3.102

Cell parameters a/b or c/a

1.019

Cell parameters c/b

0.176

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volumne (ų)

978.837

X-Ray Powder Diffraction

12.53(80),
6.27(70),
3.947(70),
2.829(100),
2.621(70),
2.324(60),
2.252(90),
1.191(70)
XRD chart Karlite

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)

2.8 - 2.85 / Durchschnittlich = 2.82

2.801 ( ρ calc. Mineralienatlas )

Instability

- verdünnte kalte HCl

(Co-)Type locality

(Co-)Type locality

Österreich/Tirol/Schwaz, Bezirk/Zillertal/Zamser Grund/Schlegeisgrund (Schlegeisspeicher)/Furtschaglspitze/Furtschaglkar

Preface

Author (Name, Year)

Franz & Ackermand & Koch, 1981

References

American Mineralogist 66 (1981), 872

Other languages

German

Karlit

Spanish

Karlita

French

Karlite

English

Karlite

Russian

Карлит

CNMNC (IMA)-Number

IMA 1980-030

CNMNC symbol

Symbol

Ka

Locations with GPS information