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Rollandite (Rollandit)

Collectors Summary

Color flaschengrün
Hardness (Mohs) 4
Cleavages gut {001}
Fracture muschelig
Solubility +++ HCl
Crystal System orthorhombisch, Pnma

Chemism

Chemical formula

Cu3[AsO4]2 ·4H2O

Chemical composition

Arsen, Kupfer, Sauerstoff, Wasserstoff

Unit weight: 540.53884 u; Number of atoms in the formula: 25

Info

Empirical formula:

Cu3[AsO4]2·4H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

1.49

8

32.00

1.0079470

8.0635760
Oxygen

O

35.52

12

48.00

15.9994300

191.9931600
Copper

Cu

35.27

3

12.00

63.5463000

190.6389000
Arsenic

As

27.72

2

8.00

74.9216020

149.8432040

Strunz 9th edition incl. updates

8.CD.30

8: Phosphate, Arsenate, Vanadate
C: Phosphate ohne weitere Anionen, mit H2O
D: Mit ausschließlich mittelgroßen Kationen, RO4:H2O = 1:2
30:Rollandit-Gruppe

Lapis Classification

VII/C.06-037

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
C: Wasserhaltige Phosphate, ohne fremde Anionen
6: Kleine und mittelgroße Kationen: Be und Al-Mn-Fe-Cu-Zn-Mg

Classification by Hölzel

8.CB.210

8: PHOSPHATES ARSENATES VANADATES
C: Phosphates (-Anions +Water)
B: Valency: 2, C medium, Me3~[XO4]2*nH2O
2: nH2O=4 Hopeite-Group

Dana 8th edition

40.03.04.02

40: Hydrated Phosphates, etc
03: Hydrated Phosphates, etc where (A++)3 (XO4)2 · x(H2O)
04: Hopeite Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

flaschengrün

max. Birefringence

0.015
Birefringence chart\! Rollandite title=Birefringence chart Rollandite

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

1.745

RI value β

1.755

RI value γ / ε

1.760

Ri mean

1.753

2V angle

Biaxial (-) 71°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pnma

Cell parameters a (Å)

5.691

Cell parameters b (Å)

17.061

Cell parameters c (Å)

9.732

Cell parameters a/b or c/a

0.334

Cell parameters c/b

0.570

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volumne (ų)

944.92

X-Ray Powder Diffraction

8.52(100),
3.721(60),
3.221(90),
3.102(40),
2.817(30),
2.795(30),
2.350(20),
2.133(20)
XRD chart Rollandite

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)

4

VHN (Hardness Vickers)

230 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.84 (berechnet)

3.799 ( ρ calc. Mineralienatlas )

Cleavages

gut {001}

Fracture

muschelig

Tenacity

sehr spröde

Instability

+++ HCl

(Co-)Type locality

(Co-)Type locality

Frankreich/Provence-Alpes-Côte d'Azur, Region/Alpes-Maritimes, Département/Nizza (Nice), Arrondissement/Daluis/Roua Mines (Clue de Roua)

Preface

Author (Name, Year)

Sarp & Cerný, 2000

Safety Instructions

Industrial chemicals are often present in powder form and therefore often contain much higher dangers than natural, crystalline substances. These hazard statements refer to the classification of industrially used chemical compounds that may also occur in this natural mineral. The hazard classification makes no claim to completeness.




Safety classes: H301: Giftig bei Verschlucken., H331: Giftig bei Einatmen., H350: Kann Krebs erzeugen., H410: Sehr giftig für Wasserorganismen mit langfristiger Wirkung.

References

European Journal of Mineralogy 12 (2000), 1045

Other languages

German

Rollandit

Spanish

Rollandita

French

Rollandite

English

Rollandite

Russian

Ролландит

CNMNC (IMA)-Number

IMA 1998-001

CNMNC symbol

Symbol

Rol

Locations with GPS information