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Rollandite

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Formula:
Cu3(AsO4)2 · 4H2O
System:
Orthorhombic
Colour:
Glass-green
Lustre:
Vitreous
Hardness:
4 - 4½
This page provides mineralogical data about Rollandite.

Classification of Rollandite

Approved 1998
8.CD.30

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
D : With only medium-sized cations, RO4:H2O = 1:2
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Type Occurrence of Rollandite

Physical Properties of Rollandite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Glass-green
Streak:
Very light green
Hardness (Mohs):
4 - 4½

Crystallography of Rollandite

Crystal System:
Orthorhombic

Optical Data of Rollandite

Type:
Biaxial (-)
RI values:
nα = 1.745 nβ = 1.755 nγ = 1.760
2V:
Measured: 71° , Calculated: 70°
Max Birefringence:
δ = 0.015
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
strong

Chemical Properties of Rollandite

Formula:
Cu3(AsO4)2 · 4H2O
Essential elements:
All elements listed in formula:

Relationship of Rollandite to other Species

8.CD.05KolbeckiteScPO4 · 2H2O
8.CD.05MetavarisciteAlPO4 · 2H2O
8.CD.05PhosphosideriteFePO4 · 2H2O
8.CD.05UM2005-02-AsO:AlHPScSiScAsO4 · 2H2O
8.CD.10MansfielditeAlAsO4 · 2H2O
8.CD.10ScoroditeFe3+AsO4 · 2H2O
8.CD.10StrengiteFePO4 · 2H2O
8.CD.10VarisciteAlPO4 · 2H2O
8.CD.10YanomamiteInAsO4 · 2H2O
8.CD.15ParascoroditeFeAsO4 · 2H2O
8.CD.20Ludlamite(Fe,Mn,Mg)3(PO4)2 · 4H2O
8.CD.25SterlinghilliteMn3(AsO4)2 · 4H2O

Other Names for Rollandite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Rollandite

Reference List:
Sarp, H. & Černý, R. (2000): Rollandite, Cu3(AsO4)2.4H2O, a new mineral: its description and crystal structure. European Journal of Mineralogy, 12, 1045-1050.

Internet Links for Rollandite

Localities for Rollandite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
France (TL)
 
  • Provence-Alpes-Côte d'Azur
    • Alpes-Maritimes
      • Guillaumes
        • Daluis
Sarp, H. and Černý, R. (2000): Rollandite, Cu3(AsO4)2.4H2O, a new mineral: its description and crystal structure. Eur. J. Mineral., 12, 1045-1050. MR 33 (2002), 169
Mineral and/or Locality  
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