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Rruffite

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Big Photo

Jote Mine, Pampa Larga district, Tierra Amarilla, Copiapó Province, Atacama Region, Chile
© L.C. 2012

Show Rruffite Photos (14)



Formula:
Ca
 
2
Cu(AsO
 
4
)
 
2
 · 2H
 
2
O
System:MonoclinicColour:Pale blue, light blue
Hardness:3
Member of:Roselite Group
Name:Named for the Rruff Project - http://rruff.info - which was in turn named after Michael Scott's cat, Rruff.


Roselite Group.

Classification of Rruffite

IMA status:Approved 2010
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID: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
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Type Occurrence of Rruffite

Type Locality:Maria Catalina mine, Pampa Larga district, Tierra Amarilla, Copiapó Province, Atacama Region, Chile
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:
ConichalciteQuartzBaryteMansfielditePharmacoalumite
MetazeuneriteBarahonaite-(Al)

Physical Properties of Rruffite

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

Crystallography of Rruffite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b {P1 1 21/b} {P21/c} {P1 21/c 1} {P21/a}
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:
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°
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:Weak, r < v

Chemical Properties of Rruffite

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

Relationship of Rruffite to other Species

Member of:Roselite Group
Other Members of Group:

- +
Brandtite
Ca
 
2
(Mn
2+
 
,Mg)(AsO
 
4
)
 
2
 · 2H
 
2
O
Kröhnkite
Na
 
2
Cu(SO
 
4
)
 
2
 · 2H
 
2
O
Roselite
Ca
 
2
(Co
2+
 
,Mg)(AsO
 
4
)
 
2
 · 2H
 
2
O
Wendwilsonite
Ca
 
2
(Mg,Co
2+
 
)(AsO
 
4
)
 
2
 · 2H
 
2
O
Zincroselite
Ca
 
2
Zn(AsO
 
4
)
 
2
 · 2H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
8.CG.05Cassidyite
Ca
 
2
(Ni
2+
 
,Mg)(PO
 
4
)
 
2
 · 2H
 
2
O
8.CG.05Collinsite
Ca
 
2
(Mg,Fe
2+
 
)(PO
 
4
)
 
2
 · 2H
 
2
O
8.CG.05Fairfieldite
Ca
 
2
(Mn
2+
 
,Fe
2+
 
)(PO
 
4
)
 
2
 · 2H
 
2
O
8.CG.05Gaitite
Ca
 
2
Zn(AsO
 
4
)
 
2
 · 2H
 
2
O
8.CG.05Messelite
Ca
 
2
(Fe
2+
 
,Mn
2+
 
)(PO
 
4
)
 
2
 · 2H
 
2
O
8.CG.05Parabrandtite
Ca
 
2
Mn
2+
 
(AsO
 
4
)
 
2
 · 2H
 
2
O
8.CG.05Talmessite
Ca
 
2
Mg(AsO
 
4
)
 
2
 · 2H
 
2
O
8.CG.05Hillite
Ca
 
2
(Zn,Mg)(PO
 
4
)
 
2
 · 2 H
 
2
O
8.CG.10Brandtite
Ca
 
2
(Mn
2+
 
,Mg)(AsO
 
4
)
 
2
 · 2H
 
2
O
8.CG.10Roselite
Ca
 
2
(Co
2+
 
,Mg)(AsO
 
4
)
 
2
 · 2H
 
2
O
8.CG.10Wendwilsonite
Ca
 
2
(Mg,Co
2+
 
)(AsO
 
4
)
 
2
 · 2H
 
2
O
8.CG.10Zincroselite
Ca
 
2
Zn(AsO
 
4
)
 
2
 · 2H
 
2
O
8.CG.15Ferrilotharmeyerite
Ca(Fe
3+
 
,Zn)
 
2
(AsO
 
4
)
 
2
 · 2(OH,H
 
2
O)
8.CG.15Lotharmeyerite
Ca(Zn,Mn
3+
 
)
 
2
(AsO
 
4
)
 
2
 · 2(H
 
2
O,OH)
8.CG.15Mawbyite
Pb(Fe
3+
 
,Zn)
 
2
(AsO
 
4
)
 
2
 · 2(OH,H
 
2
O)
8.CG.15Mounanaite
PbFe
3+
2
(VO
 
4
)
 
2
 · 2(OH,F)
8.CG.15Thometzekite
Pb(Cu,Zn)
 
2
(AsO
 
4
,SO
 
4
)
 
2
 · 2(H
 
2
O,OH)
8.CG.15Tsumcorite
Pb(Zn,Fe
3+
 
)
 
2
(AsO
 
4
)
 
2
 · 2(H
 
2
O,OH)
8.CG.15Cobaltlotharmeyerite
Ca(Co,Fe
3+
 
,Ni)
 
2
(AsO
 
4
)
 
2
 · 2(H
 
2
O,OH)
8.CG.15Cabalzarite
Ca(Mg,Al,Fe
3+
 
)
 
2
(AsO
 
4
)
 
2
 · 2(OH,H
 
2
O)
8.CG.15Krettnichite
(Pb,Sr)(Mn
3+
 
,Co)
 
2
(VO
 
4
)
 
2
 · 2(OH,H
 
2
O)
8.CG.15Cobalttsumcorite
Pb(Co,Fe
3+
 
,Ni)
 
2
(AsO
 
4
)
 
2
 · 2(H
 
2
O,OH)
8.CG.15Nickellotharmeyerite
Ca(Ni,Fe
3+
 
,Co)
 
2
(AsO
 
4
)
 
2
 · 2(H
 
2
O,OH)
8.CG.15Manganlotharmeyerite
Ca(Mn
3+
 
,Zn)
 
2
(AsO
 
4
)
 
2
 · 2(OH,H
 
2
O)
8.CG.15Schneebergite
(Bi
3+
 
,Ca)(Co,Ni,Fe
3+
 
)
 
2
(AsO
 
4
)
 
2
 · 2(OH,H
 
2
O)
8.CG.15Nickelschneebergite
(Bi
3+
 
,Ca)(Ni,Co,Fe
3+
 
)
 
2
(AsO
 
4
)
 
2
 · 2(OH,H
 
2
O)
8.CG.20Gartrellite
Pb(Cu,Fe
3+
 
,Zn)
 
2
(AsO
 
4
,SO
 
4
)
 
2
 · 2(H
 
2
O,OH)
8.CG.20Helmutwinklerite
Pb(Zn,Cu)
 
2
(AsO
 
4
)
 
2
 · 2H
 
2
O
8.CG.20Zincgartrellite
Pb(Zn,Fe
3+
 
,Cu)
 
2
(AsO
 
4
)
 
2
 · 2(H
 
2
O,OH)
8.CG.20Rappoldite
Pb(Co,Ni,Zn)
 
2
(AsO
 
4
)
 
2
 · 2H
 
2
O
8.CG.20Phosphogartrellite
Pb(Cu,Fe
3+
 
)
 
2
(PO
 
4
,AsO
 
4
)
 
2
 · 2(H
 
2
O,OH)
8.CG.20Lukrahnite
Ca(Cu,Zn)(Fe
3+
 
,Zn)(AsO
 
4
)
 
2
 · 2(H
 
2
O,OH)
8.CG.25Pottsite
HPbBi(VO
 
4
)
 
2
 · 2H
 
2
O
8.CG.35Nickeltalmessite
Ca
 
2
Ni(AsO
 
4
)
 
2
 · 2H
 
2
O

Other Names for Rruffite

Synonyms:
IMA2009-077
Other Languages:

Other Information

Fluorescence in UV light:None
Other Information:Isoluble in water, acetone and HCl
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 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

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    • Localities for Rruffite

    The 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.
    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.
    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]
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