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Rhomboclase

Pictures (3 Images total)

Rhomboklas
Views (Image: 1338147363): 993
Rhomboklas

Rhomboklas (weiß) Jarosit (gelb); Bildbreite: 3 mm; Fundort: Schnepfenbusch Schacht, Nentershausen-; Bauhaus, Richelsdorfer Gebirge, Hessen,; Deutschland.
Collection: Steinkautz
Copyright: Steinkautz
Contribution: Steinkautz 2012-05-27
Locality: Grube Schnepfenbusch (Schnepfenbach) / Bauhaus / Nentershausen / Richelsdorfer Gebirge / Hersfeld-Rotenburg, Landkreis / Kassel, Bezirk / Hessen / Deutschland
RHOMBOKLAS mit Voltait
Views (Image: 1355660843): 788
RHOMBOKLAS mit Voltait (SNr: 02389.)

SDAG Wismut Absetzerhalde im Revier Ronneburg, Thüringen, (D) BB.: ca. 9mm
Collection: Daniel Neumann
Copyright: Daniel Neumann
Contribution: Neumann 2012-12-16
Locality: Absetzerhalde / Ronneburg / Greiz, Landkreis / Thüringen / Deutschland
Rhomboklas
Views (Image: 1588152778): 164
Rhomboklas

FO: Grube Clara / Oberwolfach; BB 4,5 mm
Copyright: Halden-Joerg
Contribution: Halden-Joerg 2020-04-29
Locality: Grube Clara / Oberwolfach / Ortenaukreis / Freiburg, Bezirk / Baden-Württemberg / Deutschland

Collectors Summary

Color bläulich, farblos, grünlich, grau, gelb
Streak color weiß
Hardness (Mohs) 2
Solubility +++ H2O
Crystal System orthorhombisch, Pnma

Chemism

Chem­ical formula

(H5O2)+Fe3+(SO4)2·2H2O

Chem­ical com­po­si­tion

Eisen, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 321.040883 u; Number of atoms in the formula: 24

Info

Empirical formula:

(H5O2)+Fe(SO4)2·2H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

2.83

9

37.50

1.0079470

9.0715230
Oxygen

O

59.80

12

50.00

15.9994300

191.9931600
Sulfur

S

19.98

2

8.33

32.0655000

64.1310000
Iron

Fe

17.40

1

4.17

55.8452000

55.8452000

Anal­y­sis wt%

Fe2O3 : 24.54, SO3 : 49.27, H2O : 25.54 (Ref: Dana, 7th ed. 2)

Strunz 9th edi­tion incl. updates

7.CB.55

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

Lapis Clas­sifica­tion

VI/C.08-010

VI: SULFATE, CHROMATE, MOLYBDATE UND WOLFRAMATE
C: Wasserhaltige Sulfate, ohne fremde Anionen
8: Mittelgroße Kationen

Clas­sifica­tion by Hölzel

7.CC.300

7: SULFATES CHROMATES MOLYBDATES WOLFRAMATES
C: Sulfates (-Anions +Water)
C: Alunogen-Group

Dana 8th edi­tion

29.01.01.01

29: Hydrated Acid and Sulfates
01: Hydrated Acid and Sulfates (Hydrated, Acid)

IMA sta­tus

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

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

bläulich, farblos, grünlich, grau, gelb

Streak color

weiß

Diaphane­ity (Trans­parency)

transparent

max. Birefrin­gence

0.104
Birefringence chart\! Rhomboclase title=Birefringence chart Rhomboclase

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

1.534

RI value β

1.553

RI value γ / ε

1.638

Ri mean

1.575

2V angle

Biaxial (+) 27°

Crystallography

Crystal Sys­tem

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pnma

Cell param­e­ters a (Å)

9.687

Cell param­e­ters b (Å)

18.204

Cell param­e­ters c (Å)

5.425

Cell param­e­ters a/b or c/a

0.532

Cell param­e­ters c/b

0.298

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

90°

Z

4

Volumne (ų)

956.656

X-Ray Pow­der Diffrac­tion

9.10(100),
4.73(50),
4.05(70),
3.33(80),
3.28(80),
3.11(50),
2.287(30)
XRD chart Rhomboclase

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

VHN (Hard­ness Vick­ers)

32 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.23

2.229 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+++ H2O

(Co-)Type locality

(Co-)Type locality

Slowakei/Košický kraj/Gelnica, Okres/Smolník (Schmölnitz)/Schmölnitz-Grube

Preface

Author (Name, Year)

Krenner, 1891

References

Handbook of Mineralogy (Anthony et al.), 5 (2003), 591

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

Rhomboclase

(H5O2)+Fe3+(SO4)2·2H2O

orthorhombisch : mmm : Pnma

7.CB.55

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

Rhomboclase

(H5O2)+Fe3+(SO4)2·2H2O

orthorhombisch : mmm : Pnma

VI/C.08-010

Lausenite

Fe23+(SO4)3·6H2O

monoklin : 2/m : P21/m

VI/C.08-020

Kornelite

Fe23+(SO4)3·7H2O

monoklin : 2/m : P21/n

VI/C.08-030

Aluminocoquimbite

Al2Fe2(SO4)6(H2O)12·6H2O

trigonal : 3m : P31c

VI/C.08-035

Coquimbite

AlFe3(SO4)6(H2O)12·6H2O

trigonal : 3m : P31c

VI/C.08-040

Paracoquimbite

Fe4(SO4)6(H2O)12·6H2O

trigonal : 3 : R3

VI/C.08-050

Quenstedtite

Fe23+(SO4)3·10 H2O

triklin : 1 : P1

VI/C.08-060

Alunogen

Al2(SO4)3·17H2O

triklin : 1 : P1

VI/C.08-070

'Meta-alunogen'

Al4(SO4)6·27H2O

VI/C.08-080

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

Rhomboclase

(H5O2)+Fe3+(SO4)2·2H2O

orthorhombisch : mmm : Pnma

7.CC.300

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

Rhomboclase

(H5O2)+Fe3+(SO4)2·2H2O

orthorhombisch : mmm : Pnma

 29.01.01.01

Matteuccite

NaHSO4·H2O

monoklin : m : Aa

 29.01.02.01

Other languages

English

Rhomboclase

French

Rhomboclase

German

Rhomboklas

Spanish

Romboclasa

Russian

Ромбоклаз

Simplified Chinese

板铁矾

Alternative Name

Rhombokas

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

 DeWikiPedia - search for: Rhomboklas
Google-Bilder-Suche - search for: Rhomboklas
Mineralogisch-Petrographisches-Institut Hamburg - search for: Rhomboklas

English pages

 Mindat - search for: Rhomboclase
Webmineral - search for:Rhomboclase
Handbook-of-Mineralogy - search for: Rhomboclase
RRUFF - Raman, XRD and other mineral data - search for: Rhomboclase
RRUFF - References and PDF downloads - search for: Rhomboclase
American-Mineralogist-Crystal-Structure-Database - search for: Rhomboclase
Athena - search for: Rhomboclase

Russian pages

 Webmineral.ru - search for: Ромбоклаз

Mineral Dealer

German pages

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Crystal-Treasure.com - search for: Rhomboklas
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Locations with GPS information