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Rollandite

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Formula:
Cu
 
3
(AsO
 
4
)
 
2
 · 4H
 
2
O
System:OrthorhombicColour:Glass-green
Lustre:VitreousHardness:4 - 4½
This page provides mineralogical data about Rollandite.

Classification of Rollandite

IMA status:Approved 1998
Strunz 8th edition ID:7/C.0-37
Nickel-Strunz 10th (pending) edition ID: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

Type Locality:Roua Mines (Clue de Roua), Daluis, Guillaumes, Alpes-Maritimes, Provence-Alpes-Côte d'Azur, France

Physical Properties of Rollandite

Lustre: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°
Maximum Birefringence:δ = 0.015

Chart 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:
Cu
 
3
(AsO
 
4
)
 
2
 · 4H
 
2
O
Essential elements:As, Cu, H, O
All elements listed in formula:As, Cu, H, O

Relationship of Rollandite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.CD.05Kolbeckite
ScPO
 
4
 · 2H
 
2
O
8.CD.05Metavariscite
AlPO
 
4
 · 2H
 
2
O
8.CD.05Phosphosiderite
FePO
 
4
 · 2H
 
2
O
8.CD.05UM2005-02-AsO:AlHPScSi
ScAsO
 
4
 · 2H
 
2
O
8.CD.10Mansfieldite
AlAsO
 
4
 · 2H
 
2
O
8.CD.10Scorodite
FeAsO
 
4
 · 2H
 
2
O
8.CD.10Strengite
FePO
 
4
 · 2H
 
2
O
8.CD.10Variscite
AlPO
 
4
 · 2H
 
2
O
8.CD.10Yanomamite
InAsO
 
4
 · 2H
 
2
O
8.CD.15Parascorodite
FeAsO
 
4
 · 2H
 
2
O
8.CD.20Ludlamite
(Fe,Mn,Mg)
 
3
(PO
 
4
)
 
2
 · 4H
 
2
O
8.CD.25Sterlinghillite
Mn
 
3
(AsO
 
4
)
 
2
 · 4H
 
2
O

Other Names for Rollandite

Synonyms:
IMA1998-001
Other Languages:
German:Rollandit
Russian:Ролландит
Spanish:Rollandita

Other Information

Health Warning: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

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    • Localities for Rollandite

    Hide Locality List
    (TL) indicates type locality. ? 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
     
    • 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
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