Atencioite
A valid IMA mineral species
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About Atencioite
Formula:
Ca2Fe2+3Mg2Be4(PO4)6(OH)4 · 6H2O
Colour:
greenish brown
Hardness:
4½
Specific Gravity:
2.86
Crystal System:
Triclinic
Member of:
Name:
In honor of Dr. Daniel Atencio (b. 12 May 1959, São Caetano do Sul, São Paulo, Brazil), professor of mineralogy at the Geoscience Institute of the University of São Paulo, Brazil.
Type Locality:
Isostructural with:
Unique Identifiers
Mindat ID:
27433
Long-form identifier:
mindat:1:1:27433:7
GUID
(UUID V4):
(UUID V4):
ea6af675-49f5-4d75-8e22-71ddd34a4791
IMA Classification of Atencioite
Approved
Approval year:
2004
First published:
2006
Classification of Atencioite
8.DA.10
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
A : With small (and occasionally larger) cations
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
A : With small (and occasionally larger) cations
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 |
---|---|---|
Aco | 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 Atencioite
Colour:
greenish brown
Hardness:
4½ on Mohs scale
Tenacity:
Fragile
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
2.86(1) g/cm3 (Measured) 2.829 g/cm3 (Calculated)
Optical Data of Atencioite
Type:
Biaxial (-)
RI values:
nα = 1.613(2) nβ = 1.620(2) nγ = 1.626(2)
2V:
Measured: 60° , Calculated: 85°
Max Birefringence:
δ = 0.013
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:
Moderate
Pleochroism:
Visible
Comments:
brown, coloring dark, greenish-brown
Chemistry of Atencioite
Mindat Formula:
Ca2Fe2+3Mg2Be4(PO4)6(OH)4 · 6H2O
Crystallography of Atencioite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 6.668(1) Å, b = 9.879(1) Å, c = 9.883(1) Å
α = 73.53(1)°, β = 85.60(1)°, γ = 86.93(1)°
α = 73.53(1)°, β = 85.60(1)°, γ = 86.93(1)°
Ratio:
a:b:c = 0.675 : 1 : 1
Unit Cell V:
622.13 ų (Calculated from Unit Cell)
Z:
1
Crystal Structure
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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) |
---|---|---|---|---|---|---|---|
0019973 | Atencioite | Rastsvetaeva R K, Barinova A V, Chukanov N V, Pietraszko A (2004) Crystal structure of a magnesium-rich triclinic analogue of greifensteinite Doklady Chemistry 398 191-195 | 2004 | Galileia, Minas Gerais, Brazil | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
9.47 Å | (42) |
5.92 Å | (100) |
3.31 Å | (34) |
3.17 Å | (53) |
2.78 Å | (86) |
2.202 Å | (32) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 4b: Highly evolved igneous rocks | >3.0 |
34 : Complex granite pegmatites |
Type Occurrence of Atencioite
General Appearance of Type Material:
subparallel aggregates of poorly formed crystals up to 3 mm long, greenish brown, and also spheroidal aggregates with a diameter up to 8 mm
Place of Conservation of Type Material:
Mineralogical Museum, Technische Universitat Bergakademie), Freiberg, Germany; inv. No. 80905
Associated Minerals at Type Locality:
Reference:
Chukanov, N.V., Rastsvetaeva, R.K., Möckel, St., Zadov, A.E., and Levitskaya, L.A. (2006) The roscherite group and its new representative member atencioite, Ca2Fe2+□Mg2Fe2+2Be4(PO4)6(OH)4•6H2O. New Data on Minerals, 41,18-25.
Synonyms of Atencioite
Other Language Names for Atencioite
German:Atencioit
Relationship of Atencioite to other Species
Member of:
Other Members of this group:
Footemineite | Ca2Mn2+Mn2+2Mn2+2Be4(PO4)6(OH)4 · 6H2O | Tric. 1 : P1 |
Greifensteinite | Ca2Fe2+5Be4(PO4)6(OH)4 · 6H2O | Mon. 2/m : B2/b |
Guimarãesite | Ca2Be4Zn5(PO4)6(OH)4 · 6H2O | Mon. 2/m : B2/b |
Okruschite | Ca2Mn2+5Be4(AsO4)6(OH)4 · 6H2O | Mon. 2/m : B2/b |
Roscherite | Ca2Mn2+5Be4(PO4)6(OH)4 · 6H2O | Mon. 2/m : B2/m |
Ruifrancoite | Ca2(◻,Mn)2(Fe3+,Mn,Mg)4Be4(PO4)6(OH)4(OH,H2O)2 · 4H2O | Mon. 2/m : B2/b |
Zanazziite | Ca2Mg5Be4(PO4)6(OH)4 · 6H2O | Mon. 2/m : B2/b |
Common Associates
Associated Minerals Based on Photo Data:
15 photos of Atencioite associated with Ushkovite | MgFe3+2(PO4)2(OH)2 · 8H2O |
9 photos of Atencioite associated with Childrenite-Eosphorite Series | |
4 photos of Atencioite associated with Beryllonite | NaBePO4 |
3 photos of Atencioite associated with Childrenite | Fe2+Al(PO4)(OH)2 · H2O |
2 photos of Atencioite associated with Muscovite | KAl2(AlSi3O10)(OH)2 |
2 photos of Atencioite associated with Hydroxylherderite | CaBe(PO4)(OH) |
1 photo of Atencioite associated with Moraesite | Be2(PO4)(OH) · 4H2O |
1 photo of Atencioite associated with Cleavelandite | Na(AlSi3O8) |
1 photo of Atencioite associated with Brandãoite | BeAl2(PO4)2(OH)2(H2O)5 |
1 photo of Atencioite associated with Mica Group |
Related Minerals - Strunz-mindat Grouping
8.DA.05 | Bearsite | Be2(AsO4)(OH) · 4H2O |
8.DA.05 | Moraesite | Be2(PO4)(OH) · 4H2O |
8.DA.10 | Roscherite | Ca2Mn2+5Be4(PO4)6(OH)4 · 6H2O |
8.DA.10 | Zanazziite | Ca2Mg5Be4(PO4)6(OH)4 · 6H2O |
8.DA.10 | Greifensteinite | Ca2Fe2+5Be4(PO4)6(OH)4 · 6H2O |
8.DA.10 | Ruifrancoite | Ca2(◻,Mn)2(Fe3+,Mn,Mg)4Be4(PO4)6(OH)4(OH,H2O)2 · 4H2O |
8.DA.10 | Guimarãesite | Ca2Be4Zn5(PO4)6(OH)4 · 6H2O |
8.DA.10 | Footemineite | Ca2Mn2+Mn2+2Mn2+2Be4(PO4)6(OH)4 · 6H2O |
8.DA.10 | Okruschite | Ca2Mn2+5Be4(AsO4)6(OH)4 · 6H2O |
8.DA.15 | Uralolite | Ca2Be4(PO4)3(OH)3 · 5H2O |
8.DA.20 | Weinebeneite | CaBe3(PO4)2(OH)2 · 4H2O |
8.DA.25 | Tiptopite | K2(Na,Ca)2Li3Be6(PO4)6(OH)2 · H2O |
8.DA.40 | Spencerite | Zn4(PO4)2(OH)2 · 3H2O |
8.DA.45 | Glucine | CaBe4(PO4)2(OH)4 · 0.5H2O |
Other Information
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 Atencioite
mindat.org URL:
https://www.mindat.org/min-27433.html
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References for Atencioite
Localities for Atencioite
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.
Brazil (TL) | |
| Chukanov et al. (2006) +1 other reference |
In Coll. M. Slama +2 other references | |
| Ricardo Scholz |
| Gunnar Färber |
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Linópolis, Divino das Laranjeiras, Minas Gerais, Brazil