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Krausite

Pictures (2 Images total)

Krausit
Views (Image: 1288201422): 996
Krausit

Bildbreite: 3 mm, Fundort: Grotta dell'Allume, Porto Levante, Vulcano Insel, Messina, Sizilien, Italien

Collection: Domenico Preite
Copyright: Enrico Bonacina
Contribution: thdun5 2010-10-27
Locality: Grotta dell'Allume / Porto Levante / Vulcano, Insel / Äolische (Liparische) Inseln (Isole Eolie; Isole Lipari) / Messina, Provinz / Sizilien (Sicilia), Region / Italien
Krausit
Views (Image: 1271684150): 724
Krausit

Bildbreite: 2 mm, Fundort: Calico Mts, San Bernardino Co., Kalifornien, USA

Copyright: Luigi Chiappino
Contribution: thdun5 2010-04-19
Locality: Calico Mts. / San Bernardino Co. / Kalifornien (California) / USA

Collectors Summary

Color gelb-grünlich, hellgelb
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 2.5
Solubility ++ H2O
Crystal System monoklin, P21/m
Morphology prismatisch

Chemism

Chem­ical formula

KFe3+(SO4)2·H2O

Chem­ical com­po­si­tion

Eisen, Kalium, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 305.085274 u; Number of atoms in the formula: 15

Info

Empirical formula:

KFe(SO4)2·H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.66

2

13.33

1.0079470

2.0158940

Oxygen

O

47.20

9

60.00

15.9994300

143.9948700

Sulfur

S

21.02

2

13.33

32.0655000

64.1310000

Potassium

K

12.82

1

6.67

39.0983100

39.0983100

Iron

Fe

18.30

1

6.67

55.8452000

55.8452000

Anal­y­sis wt%

Na2O : 0.64, K2O : 14.71, Fe2O3 : 24.94, SO3 : 51.05, H2O : 5.59, SiO2 : 2.19 (Ref: American Mineralogist 31)

Strunz 9th edi­tion incl. updates

7.CC.05

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

Lapis Clas­sifica­tion

VI/C.15-010

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

Clas­sifica­tion by Hölzel

7.CD.850

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

Dana 8th edi­tion

29.05.01.01

29: Hydrated Acid and Sulfates
05: Hydrated Acid and Sulfates where A B (XO4)2 · x(H2O)

IMA sta­tus

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

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

gelb-grünlich, hellgelb

Streak color

weiß

Lus­tre

Glasglanz

max. Birefrin­gence

0.134

Birefringence chart\! Krausite title=Birefringence chart Krausite

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

1.588

RI value β

1.650

RI value γ / ε

1.722

Ri mean

1.653

2V angle

Biaxial (+) 89°

Optical Data Luminescence

Lumi­nes­cence

keine Fluoreszenz bekannt

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

11

Space Group

P21/m

Cell param­e­ters a (Å)

7.920

Cell param­e­ters b (Å)

5.146

Cell param­e­ters c (Å)

9.014

Cell param­e­ters a/b or c/a

1.539

Cell param­e­ters c/b

1.752

Cell param­e­ters α

90°

Cell param­e­ters β

102.75

Cell param­e­ters γ

90°

Z

2

Volumne (ų)

358.319

X-Ray Pow­der Diffrac­tion

6.59(70),
4.40(70),
4.26(40),
3.69(60),
3.09(100),
2.768(40),
2.579(40),
2.546(40)

XRD chart Krausite

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

Morphol­ogy

prismatisch

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

2.5

VHN (Hard­ness Vick­ers)

53 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.84

2.828 ( ρ calc. Mineralienatlas )

Radioac­tiv­ity

kaum messbar

Insta­bil­ity

++ H2O

Preface

Author (Name, Year)

Foshag, 1931

References

Handbook of Mineralogy (Anthony et al.), 5 (2003), 373

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

Krausite

KFe3+(SO4)2·H2O

monoklin : 2/m : P21/m

7.CC.05

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

Krausite

KFe3+(SO4)2·H2O

monoklin : 2/m : P21/m

VI/C.15-010

Tamarugite

NaAl(SO4)2·6H2O

monoklin : 2/m : P21/a

VI/C.15-020

Amarillite

NaFe3+(SO4)2·6H2O

monoklin : 2/m : C2/c

VI/C.15-030

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

Polyhalite

K2Ca2Mg(SO4)4·2H2O

triklin : 1 : F1

7.CD.800

Leightonite

K2Ca2Cu(SO4)4·2H2O

monoklin : 2/m : C2/c

7.CD.810

Krausite

KFe3+(SO4)2·H2O

monoklin : 2/m : P21/m

7.CD.850

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

Krausite

KFe3+(SO4)2·H2O

monoklin : 2/m : P21/m

29.05.01.01

Goldichite

KFe3+(SO4)2·4H2O

monoklin : 2/m : P21/c

29.05.02.01

Tamarugite

NaAl(SO4)2·6H2O

monoklin : 2/m : P21/a

29.05.03.01

Amarillite

NaFe3+(SO4)2·6H2O

monoklin : 2/m : C2/c

29.05.03.02

Mendozite

NaAl(SO4)2·11H2O

monoklin : 2/m : C2/c

29.05.04.01

Alum-(K)

KAl(SO4)2·12H2O

kubisch : m3 : Pa3

29.05.05.01

Alum-(Na)

NaAl(SO4)2·12H2O

kubisch : m3 : Pa3

29.05.05.02

Tschermigite

(NH4)Al(SO4)2·12H2O

kubisch : m3 : Pa3

29.05.05.03

Lonecreekite

(NH4)(Fe3+,Al)(SO4)2·12H2O

kubisch : m3 : Pa3

29.05.05.04

Lanmuchangite

TlAl[SO4]2·12H2O

kubisch : m3 : Pa3

29.05.05.05

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Краузит

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