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Bildbreite: 3 mm; Fundort: Le Cetine di Cotorniano Mine, Chiusdino, Provinz Siena, Toskana, Italien

Copyright: Leonardus
Contribution: slugslayer 2010-09-24
Locality: Le Cetine di Cotorniano Mine / Chiusdino / Siena, Provinz / Toskana (Toscana) / Italien
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Löweit Probe Kaliwerk Heinrich Rau Roßleben

Collection: Hydrobora89
Copyright: Hydrobora89
Contribution: Hydrobora89 2016-01-07
Locality: Kaliwerk Heinrich Rau / Roßleben / Kyffhäuserkreis / Thüringen / Deutschland

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 2.50 - 3.00
Solubility +++ H2O
Crystal System trigonal, R3

Chemism

Chem­ical formula

Na12Mg7(SO4)13·15H2O

Chem­ical com­po­si­tion

Magnesium, Natrium, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 1965.0643824 u; Number of atoms in the formula: 129

Info

Empirical formula:

Na12Mg7(SO4)13·15H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.54

30

23.26

1.0079470

30.2384100

Oxygen

O

54.55

67

51.94

15.9994300

1,071.9618100

Sodium

Na

14.04

12

9.30

22.9897702

275.8772424

Magnesium

Mg

8.66

7

5.43

24.3050600

170.1354200

Sulfur

S

21.21

13

10.08

32.0655000

416.8515000

Anal­y­sis wt%

Na2O : 18.58, MgO : 14.31, SO3 : 52.35, H2O : 14.80 (Ref: Dana, 7th ed. 2)

Strunz 9th edi­tion incl. updates

7.CC.45

7: Sulfate (Selenate, Tellurate, Chromate, Molybdate, Wolframate)
C: Sulfate (Selenate, etc.) ohne weitere Anionen, mit H2O
C: Mit mittelgroßen und großen [Kationen]
45:LöWeit-Gruppe

Lapis Clas­sifica­tion

VI/C.17-010

VI: SULFATE, CHROMATE, MOLYBDATE UND WOLFRAMATE
C: Wasserhaltige Sulfate, ohne fremde Anionen
17: Mittelgroße und sehr große Kationen

Clas­sifica­tion by Hölzel

7.CD.640

7: SULFATES CHROMATES MOLYBDATES WOLFRAMATES
C: Sulfates (-Anions +Water)
D: Sulfates, C medium + large
6: Voltaite-Group

Dana 8th edi­tion

29.04.03.01

29: Hydrated Acid and Sulfates
04: Hydrated Acid and Sulfates where (A+)2 Bn (XO4)p · x(H2O)

IMA sta­tus

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

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

max. Birefrin­gence

0.019

Birefringence chart\! Löweite title=Birefringence chart Löweite

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

1.490

RI value γ / ε

1.471

Ri mean

1.484

2V angle

Uniaxial (-)

Crystallography

Crystal Sys­tem

trigonal

Class (H-M)

3

Space Group number

148

Space Group

R3

Cell param­e­ters a (Å)

18.96

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

13.47

Cell param­e­ters a/b or c/a

0.710

Cell param­e­ters c/b

-

Z

3

Volumne (ų)

4193.483

X-Ray Pow­der Diffrac­tion

10.33(80),
4.29(100),
4.04(100),
3.46(90),
3.27(90),
3.17(100),
2.70(100)

XRD chart Löweite

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)

2.50 - 3.00

VHN (Hard­ness Vick­ers)

68 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.37 (gemessen)

2.334 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+++ H2O

Preface

Author (Name, Year)

Haidinger, 1846

References

Handbook of Mineralogy (Anthony et al.), 5 (2003), 413

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Löweite

Na12Mg7(SO4)13·15H2O

trigonal : 3 : R3

7.CC.45

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Löweite

Na12Mg7(SO4)13·15H2O

trigonal : 3 : R3

VI/C.17-010

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Voltaite

K2Fe2+5Fe3+3Al(SO4)12·18H2O

kubisch : m3m : Fd3c

7.CD.600

Pertlikite

K2(Fe2+,Mg)2(Mg,Fe3+)4Fe3+2Al(SO4)12·18H2O

tetragonal : 4mm : I41cd

7.CD.605

Ammoniomagnesiovoltaite

(NH4)2Mg5Fe3+3Al(SO4)12·18H2O

kubisch : m3m : Fd3c

7.CD.607

Zincovoltaite

K2(Zn,Fe2+,Mn)5Fe33+Al(SO4)12·18H2O

kubisch : m3m : Fd3c

7.CD.610

Metavoltine

K2Na6Fe2+Fe63+(SO4)12O2·18 H2O

trigonal : 3 : P3

7.CD.620

Löweite

Na12Mg7(SO4)13·15H2O

trigonal : 3 : R3

7.CD.640

Related minerals "Dana 8. Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Hydroglauberite

Na4Ca(SO4)3·2H2O

29.04.01.01

Eugsterite

Na4Ca(SO4)3·2H2O

29.04.02.01

Löweite

Na12Mg7(SO4)13·15H2O

trigonal : 3 : R3

29.04.03.01

Ferrinatrite

Na3Fe(SO4)3·3H2O

trigonal : 3 : P3

29.04.04.01

Polyhalite

K2Ca2Mg(SO4)4·2H2O

triklin : 1 : F1

29.04.05.01

Leightonite

K2Ca2Cu(SO4)4·2H2O

monoklin : 2/m : C2/c

29.04.05.02

Metavoltine

K2Na6Fe2+Fe63+(SO4)12O2·18 H2O

trigonal : 3 : P3

29.04.06.01

Görgeyite

K2Ca5(SO4)6·H2O

monoklin : 2/m : C2/c

29.04.07.01

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