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Mercallite (Mercallit)

Pictures (1 Images total)

Mercallit
Views (File:
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Mercallit
farblose Aggregate von Mercallit in Glasampulle, Vesuv, Italien; BB unb.
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Italien/Kampanien (Campania), Region/Neapel, Provinz/Somma-Vesuv-Komplex/Vesuv
Mineral: Mercallite
Image: 1587888226
License: Usage for Mineralienatlas project only
Mercallit

farblose Aggregate von Mercallit in Glasampulle, Vesuv, Italien; BB unb.
Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-04-26
Locality: Vesuv / Somma-Vesuv-Komplex / Neapel, Provinz / Kampanien (Campania), Region / Italien

Collectors Summary

Color farblos, himmelblau
Streak color weiß
Solubility +++ H2O
Crystal System orthorhombisch, Pbca

Chemism

Chemical formula

KH[SO4]

Chemical composition

Kalium, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 136.169477 u; Number of atoms in the formula: 7

Info

Empirical formula:

KH[SO4]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.74

1

14.29

1.0079470

1.0079470
Oxygen

O

47.00

4

57.14

15.9994300

63.9977200
Sulfur

S

23.55

1

14.29

32.0655000

32.0655000
Potassium

K

28.71

1

14.29

39.0983100

39.0983100

Analysis wt%

H2O : 6.62, K2O : 34.59, SO3 : 58.79 (Ref: berechnet)

Strunz 9th edition incl. updates

7.AD.10

7: Sulfate (Selenate, Tellurate, Chromate, Molybdate, Wolframate)
A: Sulfate (Selenate, etc.) ohne weitere Anionen, ohne H2O
D: Mit ausschließlich großen Kationen
10:Mercallit-Gruppe

Lapis Classification

VI/A.06-010

VI: SULFATE, CHROMATE, MOLYBDATE UND WOLFRAMATE
A: Wasserfreie Sulfate [SO4] 2-, ohne fremde Anionen
6: Sehr große Kationen

Classification by Hölzel

7.AC.100

7: SULFATES CHROMATES MOLYBDATES WOLFRAMATES
A: Sulfates (-Anions -Water)
C: Sulfates, C large

Dana 8th edition

28.01.01.01

28: Sulfate Minerals
01: Anhydrous Acid and Sulfates (Anhydrous, Acid)

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos, himmelblau

Streak color

weiß

Diaphaneity (Transparency)

transparent

max. Birefringence

0.046
Birefringence chart\! Mercallite title=Birefringence chart Mercallite

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

1.445

RI value β

1.460

RI value γ / ε

1.491

Ri mean

1.465

2V angle

Biaxial (+) 56°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

61

Space Group

Pbca

Cell parameters a (Å)

9.794

Cell parameters b (Å)

18.96

Cell parameters c (Å)

8.411

Cell parameters a/b or c/a

0.517

Cell parameters c/b

0.444

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

16

Volumne (ų)

1561.874

X-Ray Powder Diffraction

3.87(60),
3.84(100),
3.52(80),
3.41(80),
3.26(80),
3.027(60),
2.742(30),
2.371(30)
XRD chart Mercallite

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

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

2.33

2.316 ( ρ calc. Mineralienatlas )

Instability

+++ H2O

Preface

Author (Name, Year)

Carobbi, 1935

References

Handbook of Mineralogy (Anthony et al.), 5 (2003), 441

Other languages

German

Mercallit

Spanish

Mercallita

French

Mercallite

English

Mercallite

Russian

Меркаллит

CNMNC symbol

Symbol

Mec

Locations with GPS information