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.
This page provides mineralogical data about Rruffite.
Unique Identifiers
Mindat ID:
39845
Long-form identifier:
mindat:1:1:39845:1
Similar Names
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 for Standard |
|---|---|---|
| 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
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Dispersion:
Weak, r < v
Chemistry of Rruffite
Mindat Formula:
Ca2Cu(AsO4)2 · 2H2O
Element Weights:
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
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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
Other Language Names for Rruffite
Relationship of Rruffite to other Species
Member of:
Other Members of Brandtite 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 |
| Wendwilsonite | Ca2Mg(AsO4)2 · 2H2O | Mon. 2/m : P21/b |
| Zincroselite | Ca2Zn(AsO4)2 · 2H2O | Mon. 2/m : P21/b |
Common Associates
Associations 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 |
| 2 photos of Rruffite associated with Lavendulan | NaCaCu5(AsO4)4Cl · 5H2O |
Related Minerals - Strunz-mindat Grouping
| 8.CG. | Fluckite | CaMn2+(AsO3OH)2 · 2H2O |
| 8.CG. | Dondoellite | Ca2Fe(PO4)2 · 2H2O |
| 8.CG. | 'Ca-Huréaulite' | CaMn5(PO4)4 · 4H2O |
| 8.CG. | Alumolukrahnite | Ca[CuAl](AsO4)2(H2O,OH)2 |
| 8.CG.05 | Parabrandtite | Ca2Mn2+(AsO4)2 · 2H2O |
| 8.CG.05 | Talmessite | Ca2Mg(AsO4)2 · 2H2O |
| 8.CG.05 | Collinsite | Ca2Mg(PO4)2 · 2H2O |
| 8.CG.05 | Messelite | Ca2Fe2+(PO4)2 · 2H2O |
| 8.CG.05 | Gaitite | Ca2Zn(AsO4)2 · 2H2O |
| 8.CG.05 | Anorthoroselite | Ca2Co(AsO4)2 · 2H2O |
| 8.CG.05 | Cassidyite | Ca2Ni(PO4)2 · 2H2O |
| 8.CG.05 | Fairfieldite | Ca2Mn2+(PO4)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 | Zincroselite | Ca2Zn(AsO4)2 · 2H2O |
| 8.CG.10 | Roselite | Ca2Co(AsO4)2 · 2H2O |
| 8.CG.10 | Wendwilsonite | Ca2Mg(AsO4)2 · 2H2O |
| 8.CG.10 | Brandtite | Ca2Mn2+(AsO4)2 · 2H2O |
| 8.CG.10 | 'Unnamed (Fe2+-analogue of Brandtite)' | Ca2Fe2+(AsO4)2 · 2H2O |
| 8.CG.15 | Mawbyite | PbFe3+2(AsO4)2(OH)2 |
| 8.CG.15 | Thometzekite | PbCu2+2(AsO4)2 · 2H2O |
| 8.CG.15 | Yancowinnaite | PbCuAl(AsO4)2OH · H2O |
| 8.CG.15 | Schneebergite | BiCo2(AsO4)2(OH) · H2O |
| 8.CG.15 | Cabalzarite | CaMg2(AsO4)2 · 2H2O |
| 8.CG.15 | Nickelschneebergite | BiNi2(AsO4)2(OH) · H2O |
| 8.CG.15 | Lotharmeyerite | CaZn2(AsO4)2 · 2H2O |
| 8.CG.15 | Nickeltsumcorite | Pb(Ni,Fe3+)2(AsO4)2(H2O,OH)2 |
| 8.CG.15 | Magnesiofluckite | CaMg(AsO3OH)2(H2O)2 |
| 8.CG.15 | Krettnichite | PbMn3+2(VO4)2(OH)2 |
| 8.CG.15 | Cobalttsumcorite | PbCo2(AsO4)2 · 2H2O |
| 8.CG.15 | Manganlotharmeyerite | CaMn3+2(AsO4)2(OH)2 |
| 8.CG.15 | Tsumcorite | PbZn2(AsO4)2 · 2H2O |
| 8.CG.15 | Ferrilotharmeyerite | CaZnFe3+(AsO4)2(OH) · H2O |
| 8.CG.15 | Cobaltlotharmeyerite | CaCo2(AsO4)2 · 2H2O |
| 8.CG.15 | Mounanaite | PbFe3+2(VO4)2(OH)2 |
| 8.CG.15 | Nickellotharmeyerite | CaNi2(AsO4)2 · 2H2O |
| 8.CG.20 | Lukrahnite | CaCuFe3+(AsO4)2(OH,H2O)2 |
| 8.CG.20 | Helmutwinklerite | PbZn2(AsO4)2 · 2H2O |
| 8.CG.20 | Phosphogartrellite | PbCuFe3+(PO4)2(OH,H2O)2 |
| 8.CG.20 | Gartrellite | PbCuFe3+(AsO4)2(OH) · H2O |
| 8.CG.20 | Zincgartrellite | PbZn2(AsO4)2(H2O,OH)2 |
| 8.CG.20 | Rappoldite | PbCo2(AsO4)2 · 2H2O |
| 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
Showing 5 localities.
symbol to view information about a locality.
The 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).
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