Ríosecoite
A valid IMA mineral species
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About Ríosecoite
Formula:
Ca2Mg(AsO3OH)3(H2O)2
Colour:
Colorless
Lustre:
Vitreous
Hardness:
3½
Specific Gravity:
3.24
Crystal System:
Triclinic
Name:
Named for Caleta Río Seco near the type locality of Torrecillas Hill, Chile, and for the small town of Río Seco. Río Seco is Spanish for Dry River.
New structure type
Name Encoding
ASCII-7:
Riosecoite
Unique Identifiers
Mindat ID:
52989
Long-form identifier:
mindat:1:1:52989:3
IMA Classification of Ríosecoite
Approved
Approval year:
2018
First published:
2019
Type description reference:
Kampf, Anthony R., Nash, Barbara P., Celestian, Aaron J., Dini, Maurizio, Molina Donoso, Arturo A. (2019) Camanchacaite, chinchorroite, espadaite, magnesiofluckite, picaite and ríosecoite: six new hydrogen-arsenate minerals from the Torrecillas mine, Iquique Province, Chile. Mineralogical Magazine, 83 (5) 655-671 doi:10.1180/mgm.2019.28
Classification of Ríosecoite
8.CF.20
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
F : With large and medium-sized cations, RO4:H2O > 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
F : With large and medium-sized cations, RO4:H2O > 1:1
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 |
|---|---|---|
| Rse | 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 Ríosecoite
Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
3½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{010} and {001}
{010} and {001}
Fracture:
Step-Like
Density:
3.24(2) g/cm3 (Measured) 3.243 g/cm3 (Calculated)
Optical Data of Ríosecoite
Type:
Biaxial (-)
RI values:
nα = 1.637(1) nβ = 1.651(1) nγ = 1.664(1)
2V:
Measured: 88° (1), Calculated: 87.2°
Max. Birefringence:
δ = 0.027
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:
distinct, r< v
Pleochroism:
Non-pleochroic
Comments:
X^b≈18°, Y^a≈10°, Z^c≈48°
Chemistry of Ríosecoite
Mindat Formula:
Ca2Mg(AsO3OH)3(H2O)2
Element Weights:
Crystallography of Ríosecoite
Crystal System:
Triclinic
Class (H-M):
1 - Pedial
Space Group:
P1
Cell Parameters:
a = 6.8110(9) Å, b = 7.316(1) Å, c = 11.777(2) Å
α = 83.466(6)°, β = 84.394(6)°, γ = 79.779(6)°
α = 83.466(6)°, β = 84.394(6)°, γ = 79.779(6)°
Ratio:
a:b:c = 0.931 : 1 : 1.61
Unit Cell V:
571.97 ų (Calculated from Unit Cell)
Morphology:
Prisms, elongated and striated on [100] with irregular terminations that commonly come to a somewhat rounded point. Prism forms {010} and {001} were observed. The prisms are often intergrown in subparallel bundles.
Twinning:
None observed
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.18 Å | (36) |
| 4.239 Å | (35) |
| 3.578 Å | (100) |
| 3.361 Å | (41) |
| 3.142 Å | (43) |
| 3.006 Å | (48) |
| 2.914 Å | (28) |
| 2.784 Å | (71) |
Reference:
Kampf, Anthony R., Nash, Barbara P., Celestian, Aaron J., Dini, Maurizio, Molina Donoso, Arturo A. (2019) Camanchacaite, chinchorroite, espadaite, magnesiofluckite, picaite and ríosecoite: six new hydrogen-arsenate minerals from the Torrecillas mine, Iquique Province, Chile. Mineralogical Magazine, 83 (5) 655-671 doi:10.1180/mgm.2019.28
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 Ríosecoite
Place of Conservation of Type Material:
In the mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue number 67257
Associated Minerals at Type Locality:
Reference:
Kampf, Anthony R., Nash, Barbara P., Celestian, Aaron J., Dini, Maurizio, Molina Donoso, Arturo A. (2019) Camanchacaite, chinchorroite, espadaite, magnesiofluckite, picaite and ríosecoite: six new hydrogen-arsenate minerals from the Torrecillas mine, Iquique Province, Chile. Mineralogical Magazine, 83 (5) 655-671 doi:10.1180/mgm.2019.28
Synonyms of Ríosecoite
Other Language Names for Ríosecoite
Dutch:Ríosecoiet
German:Ríosecoit
Common Associates
Associations Based on Photo Data:
| 1 photo of Ríosecoite associated with Camanchacaite | NaCaMg2[AsO4][AsO3(OH)]2 |
Related Minerals - Strunz-mindat Grouping
| 8.CF. | Ferraioloite | MgMn2+4(Fe2+0.5Al3+0.5)4Zn4(PO4)8(OH)4(H2O)20 |
| 8.CF. | Naalasite | NaAl(AsO3OH)2 · H2O |
| 8.CF. | Nafeasite | Na3Fe3+3(AsO3OH)6 · 3H2O |
| 8.CF. | Falsterite | Ca2MgMn2+2Fe2+2Fe3+2Zn4(PO4)8(OH)4(H2O)14 |
| 8.CF. | Espadaite | Na4Ca3Mg2[AsO3(OH)]2[AsO2(OH)2]10 · 7H2O |
| 8.CF. | Liraite | NaCa2Mn2+2[Fe3+Fe2+]Mn2+2(PO4)6(H2O)2 |
| 8.CF.05 | Tassieite | (Na,◻)Ca2(Mg,Fe2+,Fe3+)2(Fe2+,Mg)2(Fe3+,Mg)2(PO4)6 · 2H2O |
| 8.CF.05 | Bederite | Ca2(Mn2+)4(Fe3+)2(PO4)6 · 2H2O |
| 8.CF.05 | Wicksite | NaCa2(Fe2+,Mn2+)4MgFe3+(PO4)6 · 2H2O |
| 8.CF.05 | Grischunite | NaCa2Mn2+5Fe3+(AsO4)6 · 2H2O |
| 8.CF.05 | Maneckiite | (Na◻)Ca2Fe2+2(Fe3+Mg)Mn2(PO4)6 · 2H2O |
| 8.CF.10 | Haigerachite | KFe3+3(PO3OH)2[PO2(OH)2]6 · 4H2O |
| 8.CF.10 | Yazganite | NaFe3+2(Mg,Mn2+)(AsO4)3 · H2O |
| 8.CF.15 | Currierite | Na4Ca3MgAl4(AsO3OH)12 · 9H2O |
Fluorescence of Ríosecoite
None
Other Information
Notes:
easily soluble in dilute 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 Ríosecoite
mindat.org URL:
https://www.mindat.org/min-52989.html
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Please feel free to link to this page.
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References for Ríosecoite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2018) CNMNC Newsletter No. 44, New minerals and nomenclature modifications approved in 2018. Mineralogical Magazine, 82 (4) 1015-1021 doi:10.1180/mgm.2018.148
Kampf, Anthony R., Nash, Barbara P., Celestian, Aaron J., Dini, Maurizio, Molina Donoso, Arturo A. (2019) Camanchacaite, chinchorroite, espadaite, magnesiofluckite, picaite and ríosecoite: six new hydrogen-arsenate minerals from the Torrecillas mine, Iquique Province, Chile. Mineralogical Magazine, 83 (5) 655-671 doi:10.1180/mgm.2019.28
Localities for Ríosecoite
Showing 1 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 (TL) | |
| Kampf et al. (2019) |
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Torrecillas mine, Iquique, Iquique Province, Tarapacá, Chile