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Rruffite

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Formula:
Ca2Cu(AsO4)2 · 2H2O
Colour:
Pale blue, light blue
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
3.79
Crystal System:
Monoclinic
Member of:
Name:
Named for the Rruff Project - http://rruff.info - which was in turn named after Michael Scott's cat, Rruff.
Hide all sections | Show all sections

Classification of RruffiteHide

Approved
Approval Year:
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

Physical Properties of RruffiteHide

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

Optical Data of RruffiteHide

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 RruffiteHide

Formula:
Ca2Cu(AsO4)2 · 2H2O

Crystallography of RruffiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
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 V:
403.05 ų (Calculated from Unit Cell)
Morphology:
In granular or blocky aggregates and druses
Twinning:
Common on (100)

X-Ray Powder DiffractionHide

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)

Type Occurrence of RruffiteHide

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

Synonyms of RruffiteHide

Other Language Names for RruffiteHide

Relationship of Rruffite to other SpeciesHide

Member of:
Other Members of this group:
BrandtiteCa2(Mn2+,Mg)(AsO4)2 · 2H2OMon. 2/m : P21/b
KröhnkiteNa2Cu(SO4)2 · 2H2OMon. 2/m : P21/b
RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2OMon. 2/m : P21/b
Unnamed (Fe2+-analogue of Brandtite)Ca2Fe2+(AsO4)2 · 2H2O
WendwilsoniteCa2Mg(AsO4)2 · 2H2OMon. 2/m : P21/b
ZincroseliteCa2Zn(AsO4)2 · 2H2OMon.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Conichalcite5 photos of Rruffite associated with Conichalcite on mindat.org.
Mansfieldite3 photos of Rruffite associated with Mansfieldite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.CG.05CassidyiteCa2(Ni2+,Mg)(PO4)2 · 2H2OTric.
8.CG.05CollinsiteCa2(Mg,Fe2+)(PO4)2 · 2H2OTric. 1 : P1
8.CG.05FairfielditeCa2(Mn2+,Fe2+)(PO4)2 · 2H2OTric. 1 : P1
8.CG.05GaititeCa2Zn(AsO4)2 · 2H2OTric.
8.CG.05MesseliteCa2(Fe2+,Mn2+)(PO4)2 · 2H2OTric. 1 : P1
8.CG.05ParabrandtiteCa2Mn2+(AsO4)2 · 2H2OTric.
8.CG.05β-RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2OTric.
8.CG.05TalmessiteCa2Mg(AsO4)2 · 2H2OTric.
8.CG.05HilliteCa2(Zn,Mg)(PO4)2 · 2 H2OTric. 1 : P1
8.CG.10BrandtiteCa2(Mn2+,Mg)(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.10RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.10WendwilsoniteCa2Mg(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.10ZincroseliteCa2Zn(AsO4)2 · 2H2OMon.
8.CG.15FerrilotharmeyeriteCa(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)Mon. 2/m : B2/m
8.CG.15LotharmeyeriteCa(Zn,Mn3+)2(AsO4)2 · 2(H2O,OH)Mon. 2/m : B2/m
8.CG.15MawbyitePb(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)Mon.
8.CG.15MounanaitePbFe3+2(VO4)2(OH,F)2Mon. 2/m : B2/m
8.CG.15ThometzekitePb(Cu,Zn)2(AsO4,SO4)2 · 2(H2O,OH)Mon. 2/m : B2/m
8.CG.15TsumcoritePbZn2(AsO4)2 · 2H2OMon.
8.CG.15CobaltlotharmeyeriteCa(Co,Fe3+,Ni)2(AsO4)2 · 2(H2O,OH)Mon. 2/m : B2/m
8.CG.15CabalzariteCa(Mg,Al,Fe3+)2(AsO4)2(OH,H2O)2Mon. 2/m : B2/m
8.CG.15KrettnichitePbMn3+2(VO4)2(OH)2Mon. 2/m : B2/m
8.CG.15CobalttsumcoritePb(Co,Fe3+,Ni)2(AsO4)2 · 2(H2O,OH)Mon. 2/m : B2/m
8.CG.15NickellotharmeyeriteCa(Ni,Fe3+,Co)2(AsO4)2 · 2(H2O,OH)Mon. 2/m : B2/m
8.CG.15ManganlotharmeyeriteCaMn3+2(AsO4)2(OH)2Mon. 2/m : B2/m
8.CG.15Schneebergite(Bi3+,Ca)(Co,Ni,Fe3+)2(AsO4)2(OH,H2O)2Mon. 2/m : B2/m
8.CG.15Nickelschneebergite(Bi3+,Ca)(Ni,Co,Fe3+)2(AsO4)2 · 2(OH,H2O)Mon. 2/m : B2/m
8.CG.20GartrellitePb(Cu,Fe3+,Zn)2(AsO4,SO4)2 · 2(H2O,OH)Tric. 1 : P1
8.CG.20HelmutwinkleritePb(Zn,Cu)2(AsO4)2 · 2H2OTric.
8.CG.20ZincgartrellitePb(Zn,Fe3+,Cu)2(AsO4)2 · 2(H2O,OH)Tric. 1 : P1
8.CG.20RappolditePb(Co,Ni,Zn)2(AsO4)2 · 2H2OTric.
8.CG.20PhosphogartrellitePb(Cu,Fe3+)2(PO4,AsO4)2 · 2(H2O,OH)Tric.
8.CG.20LukrahniteCa(Cu,Zn)(Fe3+,Zn)(AsO4)2 · 2(H2O,OH)Tric. 1 : P1
8.CG.25Pottsite(Pb3xBi4-2x)(VO4)4·H2O (0.8 < x < 1.0)Tet. 4/m : I41/a
8.CG.35NickeltalmessiteCa2Ni(AsO4)2 · 2H2OTric. 1 : P1

Related Minerals - Dana Grouping (8th Ed.)Hide

40.2.4.1ProsperiteCa2Zn4(AsO4)4•H2O · Mon.

Fluorescence of RruffiteHide

Other InformationHide

Notes:
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 RruffiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 RruffiteHide

Localities for RruffiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Chile
 
  • Atacama Region
    • Copiapó Province
      • Tierra Amarilla
        • Pampa Larga district
Samples analysed by Dr. Anthony Kampf, Natural History Museum of Los Angeles County, USA; Kampf, A. R., Mills, S. J., Housley, R. M., Rossman, G. R., Nash, B. P., Dini, M., & Jenkins, R. A. (2013). Joteite, Ca2CuAl [AsO4][AsO3 (OH)] 2 (OH) 2· 5H2O, a new arsenate with a sheet structure and unconnected acid arsenate groups. Mineralogical Magazine, 77(6), 2811-2823.; Kampf, A. R., Mills, S. J., Nash, B. P., Dini, M., & Molina Donoso, A. A. (2015). Tapiaite, Ca5Al2 (AsO4) 4 (OH) 4· 12H2O, a new mineral from the Jote mine, Tierra Amarilla, Chile. Mineralogical Magazine, 79(2), 345-354.
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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