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Rruffite

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Formula:
Ca2Cu(AsO4)2 · 2H2O
System:
Monoclinic
Colour:
Pale blue, light blue
Hardness:
3
Member of:
Name:
Named for the Rruff Project - http://rruff.info - which was in turn named after Michael Scott's cat, Rruff.

Classification of Rruffite

Approved 2010
8.CG.10

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1
40.2.4.5

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2 : AB2(XO4)2·xH2O
mindat.org URL:
http://www.mindat.org/min-39845.html
Please feel free to link to this page.

Type Occurrence of Rruffite

General Appearance of Type Material:
Secondary mineral
Geological Setting of Type Material:
The oxydation zone of a Cu-As orebody

Physical Properties of Rruffite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Pale blue, light blue
Streak:
White
Hardness (Mohs):
3
Tenacity:
Brittle
Cleavage:
Perfect
on{010}
Density:
3.79(3) g/cm3 (Measured)    3.77(2) g/cm3 (Calculated)

Crystallography of Rruffite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Space Group Setting:
P21/c
Cell Parameters:
a = 5.8618(2) Å, b = 12.7854(5) Å, c = 5.7025(2) Å
β = 109.425(2)°
Ratio:
a:b:c = 0.458 : 1 : 0.446
Unit Cell Volume:
V 403.05 ų (Calculated from Unit Cell)
Morphology:
In granular or blocky aggregates and druses
Twinning:
Common on (100)
X-Ray Powder Diffraction Data:
d-spacingIntensity
5.087(42)
4.177(59)
3.800(41)
3.377(92)
3.190(56)
2.983(89)
2.827(100)
2.114(49)

Optical Data of Rruffite

Type:
Biaxial (-)
RI values:
nα = 1.725(1) nβ = 1.734(1) nγ = 1.740(1)
2V:
Measured: 80° (2), Calculated: 78°
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:
Weak, r < v

Chemical Properties of Rruffite

Formula:
Ca2Cu(AsO4)2 · 2H2O
Essential elements:
All elements listed in formula:

Relationship of Rruffite to other Species

Member of:
Other Members of Group:
BrandtiteCa2(Mn2+,Mg)(AsO4)2 · 2H2O
KröhnkiteNa2Cu(SO4)2 · 2H2O
RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2O
Unnamed (Fe2+-analogue of Brandtite)Ca2Fe2+(AsO4)2 · 2H2O
WendwilsoniteCa2Mg(AsO4)2 · 2H2O
ZincroseliteCa2Zn(AsO4)2 · 2H2O
8.CG.05CassidyiteCa2(Ni2+,Mg)(PO4)2 · 2H2O
8.CG.05CollinsiteCa2(Mg,Fe2+)(PO4)2 · 2H2O
8.CG.05FairfielditeCa2(Mn2+,Fe2+)(PO4)2 · 2H2O
8.CG.05GaititeCa2Zn(AsO4)2 · 2H2O
8.CG.05MesseliteCa2(Fe2+,Mn2+)(PO4)2 · 2H2O
8.CG.05ParabrandtiteCa2Mn2+(AsO4)2 · 2H2O
8.CG.05TalmessiteCa2Mg(AsO4)2 · 2H2O
8.CG.05HilliteCa2(Zn,Mg)(PO4)2 · 2 H2O
8.CG.10BrandtiteCa2(Mn2+,Mg)(AsO4)2 · 2H2O
8.CG.10RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2O
8.CG.10WendwilsoniteCa2Mg(AsO4)2 · 2H2O
8.CG.10ZincroseliteCa2Zn(AsO4)2 · 2H2O
8.CG.15FerrilotharmeyeriteCa(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)
8.CG.15LotharmeyeriteCa(Zn,Mn3+)2(AsO4)2 · 2(H2O,OH)
8.CG.15MawbyitePb(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)
8.CG.15MounanaitePbFe23+(VO4)2(OH,F)2
8.CG.15ThometzekitePb(Cu,Zn)2(AsO4,SO4)2 · 2(H2O,OH)
8.CG.15TsumcoritePb(Zn,Fe3+)2(AsO4)2 · 2(H2O,OH)
8.CG.15CobaltlotharmeyeriteCa(Co,Fe3+,Ni)2(AsO4)2 · 2(H2O,OH)
8.CG.15CabalzariteCa(Mg,Al,Fe3+)2(AsO4)2(OH,H2O)2
8.CG.15Krettnichite(Pb,Sr)(Mn3+,Co)2(VO4)2 · 2(OH,H2O)
8.CG.15CobalttsumcoritePb(Co,Fe3+,Ni)2(AsO4)2 · 2(H2O,OH)
8.CG.15NickellotharmeyeriteCa(Ni,Fe3+,Co)2(AsO4)2 · 2(H2O,OH)
8.CG.15ManganlotharmeyeriteCa(Mn3+,Zn)2(AsO4)2(OH,H2O)2
8.CG.15Schneebergite(Bi3+,Ca)(Co,Ni,Fe3+)2(AsO4)2(OH,H2O)2
8.CG.15Nickelschneebergite(Bi3+,Ca)(Ni,Co,Fe3+)2(AsO4)2 · 2(OH,H2O)
8.CG.20GartrellitePb(Cu,Fe3+,Zn)2(AsO4,SO4)2 · 2(H2O,OH)
8.CG.20HelmutwinkleritePb(Zn,Cu)2(AsO4)2 · 2H2O
8.CG.20ZincgartrellitePb(Zn,Fe3+,Cu)2(AsO4)2 · 2(H2O,OH)
8.CG.20RappolditePb(Co,Ni,Zn)2(AsO4)2 · 2H2O
8.CG.20PhosphogartrellitePb(Cu,Fe3+)2(PO4,AsO4)2 · 2(H2O,OH)
8.CG.20LukrahniteCa(Cu,Zn)(Fe3+,Zn)(AsO4)2 · 2(H2O,OH)
8.CG.25PottsiteHPbBi(VO4)2 · 2H2O
8.CG.35NickeltalmessiteCa2Ni(AsO4)2 · 2H2O

Other Names for Rruffite

Name in Other Languages:

Other Information

Other Information:
Isoluble in water, acetone and HCl
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 Rruffite

Reference List:
Yang, H., Jenkins, R.A., Downs, R.T., Evans, S.H., Tait, K.T. (2011): Rruffite, Ca2Cu(AsO4)2·2H2O,a new member of the roselite group, from Tierra Amarilla, Chile. Canadian Mineralogist, 49, 877-884

Internet Links for Rruffite

Localities for Rruffite

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.
Chile
 
  • Atacama Region
    • Copiapó Province
      • Tierra Amarilla
        • Pampa Larga district
Samples analysed by Dr. Anthony Kampf, Natural History Museum of Los Angeles County, USA
Yang, H., Jenkins, R.A., Downs, R.T., Evans, S.H., Tait, K.T. (2011): Rruffite, Ca2Cu(AsO4)2·2H2O,a new member of the roselite group, from Tierra Amarilla, Chile. Canadian Mineralogist, 49, 877-884
Spain
 
  • Valencian Community
    • Castellón
Mineralogía de la concesión San Rafael, Villahermosa del Río, Castellón, España
        • San Rafael claim
- Cócera, H., Menor-Salván, C. and Muñoz-Alvarado, R. (2010): Mineralogía de la concesión San Rafael, Villahermosa del Río, Castellón, España. Acopios, 1, 1-51. [http://mti-acopios.blogspot.com/ ; http://issuu.com/malacate/docs/acopios-1-1?mode=a_p]
- Cócera, H., Menor-Salván, C. and Muñoz-Alvarado, R. (2010): Mineralogía de la concesión San Rafael, Villahermosa del Río, Castellón, España. Acopios, 1, 1-51. [http://mti-acopios.blogspot.com/ ; http://issuu.com/malacate/docs/acopios-1-1?mode=a_p]
Mineral and/or Locality  
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