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Goldichite

Collectors Summary

Color hellgelbgrün
Streak color weiß
Hardness (Mohs) 2.5
Solubility +++ heiße , verdünnte Säuren, + kaltes H2O
Crystal System monoklin, P21/c

Chemism

Chem­ical formula

KFe3+(SO4)2·4H2O

Chem­ical com­po­si­tion

Eisen, Kalium, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 359.131246 u; Number of atoms in the formula: 24

Info

Empirical formula:

KFe(SO4)2·4H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

2.25

8

33.33

1.0079470

8.0635760

Oxygen

O

53.46

12

50.00

15.9994300

191.9931600

Sulfur

S

17.86

2

8.33

32.0655000

64.1310000

Potassium

K

10.89

1

4.17

39.0983100

39.0983100

Iron

Fe

15.55

1

4.17

55.8452000

55.8452000

Anal­y­sis wt%

K2O : 12.87, Fe2O3 : 22.16, SO3 : 43.65, H2O : 20.35 (Ref: American Mineralogist 55)

Strunz 9th edi­tion incl. updates

7.CC.40

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

Lapis Clas­sifica­tion

VI/C.16-030

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

Clas­sifica­tion by Hölzel

7.CD.570

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

Dana 8th edi­tion

29.05.02.01

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

hellgelbgrün

Streak color

weiß

max. Birefrin­gence

0.047

Birefringence chart\! Goldichite title=Birefringence chart Goldichite

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

1.582

RI value β

1.602

RI value γ / ε

1.629

Ri mean

1.604

2V angle

Biaxial (+) 82°

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/c

Cell param­e­ters a (Å)

10.435

Cell param­e­ters b (Å)

10.523

Cell param­e­ters c (Å)

9.130

Cell param­e­ters a/b or c/a

0.992

Cell param­e­ters c/b

0.868

Cell param­e­ters α

90°

Cell param­e­ters β

101.55

Cell param­e­ters γ

90°

Z

4

Volumne (ų)

982.241

X-Ray Pow­der Diffrac­tion

10.29(80),
7.35(90),
6.85(70),
4.00(60),
3.403(60),
3.247(50),
3.068(100),
2.656(60)

XRD chart Goldichite

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)

2.5

VHN (Hard­ness Vick­ers)

53 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.43

2.428 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+++ heiße , verdünnte Säuren, + kaltes H2O

Preface

Author (Name, Year)

Rosenzweig & Gross, 1955

References

American Mineralogist 40 (1955), 469

Yang, Z. & Giester, Hydrogen bonding in goldichite, KFe(SO4)2⋅4H2O: structure refinement, G. Miner Petrol (2018) 112: 135. https://doi.org/10.1007/s00710-017-0524-0

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

Goldichite

KFe3+(SO4)2·4H2O

monoklin : 2/m : P21/c

7.CC.40

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

Kröhnkite

Na2Cu(SO4)2· 2H2O

monoklin : 2/m : P21/c

VI/C.16-010

Ferrinatrite

Na3Fe(SO4)3·3H2O

trigonal : 3 : P3

VI/C.16-020

Goldichite

KFe3+(SO4)2·4H2O

monoklin : 2/m : P21/c

VI/C.16-030

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

Blödite

Na2Mg(SO4)2·4H2O

monoklin : 2/m : P21/a

7.CD.500

Leonite

K2Mg(SO4)2·4H2O

monoklin : 2/m : C2/m

7.CD.510

Mereiterite

K2Fe2+[SO4]2·4H2O

monoklin : 2/m : C2/m

7.CD.515

Nickelblödite

Na2(Ni,Mg)(SO4)2·4H2O

monoklin : 2/m : P21/a

7.CD.520

Manganoblödite

Na2Mn(SO4)2·4H2O

monoklin : 2/m : P21/a

7.CD.530

Goldichite

KFe3+(SO4)2·4H2O

monoklin : 2/m : P21/c

7.CD.570

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

Other languages

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English

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Russian

Гольдичит

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