Rruffite
A valid IMA mineral species
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About Rruffite
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.
Unique Identifiers
Mindat ID:
39845
Long-form identifier:
mindat:1:1:39845:1
GUID
(UUID V4):
(UUID V4):
44728ca0-5221-4780-8f45-d04fe11fbfba
IMA Classification of Rruffite
Classification of Rruffite
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
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
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2 : AB2(XO4)2·xH2O
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Ruf | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Rruffite
Vitreous
Transparency:
Transparent
Colour:
Pale blue, light blue
Streak:
White
Hardness:
3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
On {010}.
On {010}.
Density:
3.79(3) g/cm3 (Measured) 3.77(2) g/cm3 (Calculated)
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.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
Weak, r < v
Chemistry of Rruffite
Mindat Formula:
Ca2Cu(AsO4)2 · 2H2O
Crystallography of Rruffite
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)°
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)
Crystal Structure
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2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0018388 | Rruffite | 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 The Canadian Mineralogist 49 877-884 | 2011 | the Maria Catalina mine, Tierra Amarilla, Chile | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
5.087 Å | (42) |
4.177 Å | (59) |
3.800 Å | (41) |
3.377 Å | (92) |
3.190 Å | (56) |
2.983 Å | (89) |
2.827 Å | (100) |
2.114 Å | (49) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Rruffite
General Appearance of Type Material:
Secondary mineral.
Place of Conservation of Type Material:
Mineral Museum, University of Arizona, Arizona, USA (18813).
The RRUFF project, Tucson, Arizona, USA (R070431).
The RRUFF project, Tucson, Arizona, USA (R070431).
Geological Setting of Type Material:
The oxydation zone of a Cu-As orebody.
Associated Minerals at Type Locality:
Synonyms of Rruffite
Relationship of Rruffite to other Species
Member of:
Other Members of this group:
Brandtite | Ca2Mn2+(AsO4)2 · 2H2O | Mon. 2/m : P21/b |
Dobšináite | Ca2Ca(AsO4)2 · 2H2O | Mon. 2/m : P21/b |
Kröhnkite | Na2Cu(SO4)2 · 2H2O | Mon. 2/m : P21/b |
Roselite | Ca2Co(AsO4)2 · 2H2O | Mon. 2/m : P21/b |
Unnamed (Fe2+-analogue of Brandtite) | Ca2Fe2+(AsO4)2 · 2H2O | |
Wendwilsonite | Ca2Mg(AsO4)2 · 2H2O | Mon. 2/m : P21/b |
Zincroselite | Ca2Zn(AsO4)2 · 2H2O | Mon. 2/m : P21/b |
Common Associates
Associated Minerals Based on Photo Data:
10 photos of Rruffite associated with Mansfieldite | AlAsO4 · 2H2O |
8 photos of Rruffite associated with Conichalcite | CaCu(AsO4)(OH) |
6 photos of Rruffite associated with Pharmacoalumite | KAl4(AsO4)3(OH)4 · 6.5H2O |
1 photo of Rruffite associated with Lavendulan | NaCaCu5(AsO4)4Cl · 5H2O |
Related Minerals - Strunz-mindat Grouping
8.CG. | Ca-Huréaulite | CaMn5(PO4)4 · 4H2O |
8.CG. | Fluckite | CaMn2+(AsO3OH)2 · 2H2O |
8.CG. | Dondoellite | Ca2Fe(PO4)2 · 2H2O |
8.CG. | Alumolukrahnite | Ca[CuAl](AsO4)2(H2O,OH)2 |
8.CG.05 | Cassidyite | Ca2Ni(PO4)2 · 2H2O |
8.CG.05 | Collinsite | Ca2Mg(PO4)2 · 2H2O |
8.CG.05 | Fairfieldite | Ca2Mn2+(PO4)2 · 2H2O |
8.CG.05 | Gaitite | Ca2Zn(AsO4)2 · 2H2O |
8.CG.05 | Messelite | Ca2Fe2+(PO4)2 · 2H2O |
8.CG.05 | Parabrandtite | Ca2Mn2+(AsO4)2 · 2H2O |
8.CG.05 | Anorthoroselite | Ca2Co(AsO4)2 · 2H2O |
8.CG.05 | Talmessite | Ca2Mg(AsO4)2 · 2H2O |
8.CG.05 | Hillite | Ca2Zn(PO4)2 · 2H2O |
8.CG.05 | Unnamed (Fe2+-analogue of Parabrandtite) | Ca2Fe2+(AsO4)2 · 2H2O |
8.CG.10 | Brandtite | Ca2Mn2+(AsO4)2 · 2H2O |
8.CG.10 | Roselite | Ca2Co(AsO4)2 · 2H2O |
8.CG.10 | Wendwilsonite | Ca2Mg(AsO4)2 · 2H2O |
8.CG.10 | Zincroselite | Ca2Zn(AsO4)2 · 2H2O |
8.CG.10 | Unnamed (Fe2+-analogue of Brandtite) | Ca2Fe2+(AsO4)2 · 2H2O |
8.CG.15 | Ferrilotharmeyerite | CaZnFe3+(AsO4)2(OH) · H2O |
8.CG.15 | Lotharmeyerite | CaZn2(AsO4)2 · 2H2O |
8.CG.15 | Mawbyite | PbFe3+2(AsO4)2(OH)2 |
8.CG.15 | Mounanaite | PbFe3+2(VO4)2(OH,F)2 |
8.CG.15 | Thometzekite | PbCu2+2(AsO4)2 · 2H2O |
8.CG.15 | Tsumcorite | PbZn2(AsO4)2 · 2H2O |
8.CG.15 | Cobaltlotharmeyerite | CaCo2(AsO4)2 · 2H2O |
8.CG.15 | Cabalzarite | CaMg2(AsO4)2 · 2H2O |
8.CG.15 | Krettnichite | PbMn3+2(VO4)2(OH)2 |
8.CG.15 | Cobalttsumcorite | PbCo2(AsO4)2 · 2H2O |
8.CG.15 | Nickellotharmeyerite | CaNi2(AsO4)2 · 2H2O |
8.CG.15 | Manganlotharmeyerite | CaMn3+2(AsO4)2(OH)2 |
8.CG.15 | Schneebergite | BiCo2(AsO4)2(OH) · H2O |
8.CG.15 | Nickelschneebergite | BiNi2(AsO4)2(OH) · H2O |
8.CG.15 | Yancowinnaite | PbCuAl(AsO4)2OH · H2O |
8.CG.15 | Nickeltsumcorite | Pb(Ni,Fe3+)2(AsO4)2(H2O,OH)2 |
8.CG.15 | Magnesiofluckite | CaMg(AsO3OH)2(H2O)2 |
8.CG.20 | Gartrellite | PbCuFe3+(AsO4)2(OH) · H2O |
8.CG.20 | Helmutwinklerite | PbZn2(AsO4)2 · 2H2O |
8.CG.20 | Zincgartrellite | PbZn2(AsO4)2(H2O,OH)2 |
8.CG.20 | Rappoldite | PbCo2(AsO4)2 · 2H2O |
8.CG.20 | Phosphogartrellite | PbCuFe3+(PO4)2(OH,H2O)2 |
8.CG.20 | Lukrahnite | CaCuFe3+(AsO4)2(OH,H2O)2 |
8.CG.25 | Pottsite | (Pb3xBi4-2x)(VO4)4 · H2O (0.8 < x < 1.0) |
8.CG.25 | Armellinoite-(Ce) | Ca4Ce4+(AsO4)4 · H2O |
8.CG.35 | Nickeltalmessite | Ca2Ni(AsO4)2 · 2H2O |
8.CG.55 | Irhtemite | Ca4Mg(AsO4)2(HAsO4)2 · 4H2O |
Fluorescence of Rruffite
None
Other Information
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.
Internet Links for Rruffite
mindat.org URL:
https://www.mindat.org/min-39845.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Rruffite
Localities for Rruffite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Chile | |
| Samples analysed by Dr. Anthony Kampf +2 other references |
| Yang et al. (2011) |
Spain | |
| Mineralogía de la concesión San Rafael |
| issuu.com (n.d.) +1 other reference |
issuu.com (n.d.) +1 other reference |
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Jote Mine, Pampa Larga mining district, Tierra Amarilla, Copiapó Province, Atacama, Chile