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Mallardite (Mallardit)

Collectors Summary

Color farblos, weiß, hellrosa
Streak color weiß
Hardness (Mohs) 2
Solubility +++ H2O, dehydratisiert schnell bei Raumtemperatur
Crystal System monoklin, P21/c

Chemism

Chemical formula

Mn2+SO4·7H2O

Chemical composition

Mangan, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 277.1085379 u; Number of atoms in the formula: 27

Info

Empirical formula:

MnSO4·7H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

5.09

14

51.85

1.0079470

14.1112580
Oxygen

O

63.51

11

40.74

15.9994300

175.9937300
Sulfur

S

11.57

1

3.70

32.0655000

32.0655000
Manganese

Mn

19.83

1

3.70

54.9380499

54.9380499

Analysis wt%

CaO : 0.70, MgO : 0.60, MnO : 23.60, SO3 : 29.00, H2O : 44.50 (Ref: Dana, 7th ed. 2)

Strunz 9th edition incl. updates

7.CB.35

7: Sulfate (Selenate, Tellurate, Chromate, Molybdate, Wolframate)
C: Sulfate (Selenate, etc.) ohne weitere Anionen, mit H2O
B: Mit ausschließlich mittelgroßen Kationen
35:Melanterit-Gruppe

Lapis Classification

VI/C.06-020

VI: SULFATE, CHROMATE, MOLYBDATE UND WOLFRAMATE
C: Wasserhaltige Sulfate, ohne fremde Anionen
6: Mittelgroße Kationen; Melanterit-Gruppe

Classification by Hölzel

7.CB.460

7: SULFATES CHROMATES MOLYBDATES WOLFRAMATES
C: Sulfates (-Anions +Water)
B: Vitriol-Group, Mg,Fe,Co,Ni,Mn,Cu,Zn-Sulfates with 4 to 7 Water
4: Epsomite-Group

Dana 8th edition

29.06.10.05

29: Hydrated Acid and Sulfates
06: Hydrated Acid and Sulfates where A XO4 · x(H2O)
10: Melanterite Group (Heptahydrates, Monoclinic: P21/c)

IMA status

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

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos, weiß, hellrosa

Streak color

weiß

Diaphaneity (Transparency)

transparent

max. Birefringence

0.012
Birefringence chart\! Mallardite title=Birefringence chart Mallardite

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

1.462

RI value β

1.465

RI value γ / ε

1.474

Ri mean

1.467

2V angle

Biaxial (+) 60°

Optical Data Luminescence

Luminescence

keine Fluoreszenz bekannt

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/c

Cell parameters a (Å)

14.15

Cell parameters b (Å)

6.50

Cell parameters c (Å)

11.06

Cell parameters a/b or c/a

2.177

Cell parameters c/b

1.702

Cell parameters α

90°

Cell parameters β

105.60

Cell parameters γ

90°

Z

4

Volume (ų)

979.771

X-Ray Powder Diffraction

5.49(70),
4.92(100),
4.88(50),
4.04(20),
3.79(40),
3.26(30),
3.13(30),
2.758(40)
XRD chart Mallardite

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

Physical Properties

Hardness (Mohs)

2

VHN (Hardness Vickers)

32 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

1.846

1.878 ( ρ calc. Mineralienatlas )

Instability

+++ H2O, dehydratisiert schnell bei Raumtemperatur

(Co-)Type locality

(Co-)Type locality

USA/Utah/Juab County/Tintic District/Butterfield Canyon/Lucky Boy Mine

Preface

Author (Name, Year)

Carnot, 1879

References

Handbook of Mineralogy (Anthony et al.), 5 (2003), 425

Other languages

German

Mallardit

Spanish

Mallardita

English

Mallardite

French

Mallardite

CNMNC symbol

Symbol

Mal

Locations with GPS information

IDs

GUSID (Global unique identifier short form) wyJD0iwIqUu7PA6dC_CZlg
GUID (Global unique identifier) D24322C3-082C-4BA9-BB3C-0E9D0BF09996
Database ID 2345