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Atencioite

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About AtencioiteHide

07267310014947002519984.jpg
Dr. Daniel Atencio
Formula:
Ca2Fe2+3Mg2Be4(PO4)6(OH)4 · 6H2O
Colour:
greenish brown
Hardness:
Specific Gravity:
2.86
Crystal System:
Triclinic
Name:
In honor of Dr. Daniel Atencio, professor of mineralogy at the Geoscience Institute of the University of São Paulo, Brazil.
Isostructural with:

Classification of AtencioiteHide

Approved
Approval Year:
2004
8.DA.10

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
A : With small (and occasionally larger) cations

Physical Properties of AtencioiteHide

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 AtencioiteHide

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.
Surface Relief:
Moderate
Pleochroism:
Visible
Comments:
brown, coloring dark, greenish-brown

Chemical Properties of AtencioiteHide

Formula:
Ca2Fe2+3Mg2Be4(PO4)6(OH)4 · 6H2O

Crystallography of AtencioiteHide

Crystal System:
Triclinic
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)°
Ratio:
a:b:c = 0.675 : 1 : 1
Unit Cell V:
622.13 ų (Calculated from Unit Cell)
Z:
1

Geological EnvironmentHide

Paragenetic Mode(s):

Type Occurrence of AtencioiteHide

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:

Synonyms of AtencioiteHide

Other Language Names for AtencioiteHide

German:Atencioit

Relationship of Atencioite to other SpeciesHide

Other Members of this group:
FootemineiteCa2Mn2+Mn2+2Mn2+2Be4(PO4)6(OH)4 · 6H2OTric. 1 : P1
GreifensteiniteCa2Fe2+5Be4(PO4)6(OH)4 · 6H2OMon.
GuimarãesiteCa2Be4Zn5(PO4)6(OH)4 · 6H2OMon. 2/m : B2/b
OkruschiteCa2Mn2+5Be4(AsO4)6(OH)4·6H2OMon. 2/m : B2/b
RoscheriteCa2Mn2+5Be4(PO4)6(OH)4 · 6H2OMon. 2/m : B2/m
RuifrancoiteCa2(◻,Mn)2(Fe3+,Mn,Mg)4Be4(PO4)6(OH)4(OH,H2O)2 · 4H2OMon. 2/m : B2/b
ZanazziiteCa2Mg5Be4(PO4)6(OH)4 · 6H2OMon. 2/m : B2/b

Common AssociatesHide

Associated Minerals Based on Photo Data:
11 photos of Atencioite associated with UshkoviteMgFe3+2(PO4)2(OH)2 · 8H2O
4 photos of Atencioite associated with BerylloniteNaBePO4
3 photos of Atencioite associated with Childrenite-Eosphorite Series
1 photo of Atencioite associated with MoraesiteBe2(PO4)(OH) · 4H2O
1 photo of Atencioite associated with CleavelanditeNa(AlSi3O8)
1 photo of Atencioite associated with MuscoviteKAl2(AlSi3O10)(OH)2
1 photo of Atencioite associated with ChildreniteFe2+Al(PO4)(OH)2 · H2O

Related Minerals - Nickel-Strunz GroupingHide

8.DA.05BearsiteBe2(AsO4)(OH) · 4H2OMon.
8.DA.05MoraesiteBe2(PO4)(OH) · 4H2OMon.
8.DA.10RoscheriteCa2Mn2+5Be4(PO4)6(OH)4 · 6H2OMon. 2/m : B2/m
8.DA.10ZanazziiteCa2Mg5Be4(PO4)6(OH)4 · 6H2OMon. 2/m : B2/b
8.DA.10GreifensteiniteCa2Fe2+5Be4(PO4)6(OH)4 · 6H2OMon.
8.DA.10RuifrancoiteCa2(◻,Mn)2(Fe3+,Mn,Mg)4Be4(PO4)6(OH)4(OH,H2O)2 · 4H2OMon. 2/m : B2/b
8.DA.10GuimarãesiteCa2Be4Zn5(PO4)6(OH)4 · 6H2OMon. 2/m : B2/b
8.DA.10FootemineiteCa2Mn2+Mn2+2Mn2+2Be4(PO4)6(OH)4 · 6H2OTric. 1 : P1
8.DA.15UraloliteCa2Be4(PO4)3(OH)3 · 5H2OMon.
8.DA.20WeinebeneiteCaBe3(PO4)2(OH)2 · 4H2OMon.
8.DA.25TiptopiteK2(Na,Ca)2Li3Be6(PO4)6(OH)2 · H2OHex.
8.DA.30Veszelyite(Cu,Zn)2Zn(PO4)2 · 2H2OMon. 2/m : P21/b
8.DA.35Kipushite(Cu,Zn)5Zn(PO4)2(OH)6 · H2OMon.
8.DA.35Philipsburgite(Cu,Zn)6(AsO4,PO4)2(OH)6 · H2OMon.
8.DA.40SpenceriteZn4(PO4)2(OH)2 · 3H2OMon. 2/m : P2/b
8.DA.45GlucineCaBe4(PO4)2(OH)4 · 0.5H2O
8.DA.50Ianbruceite[Zn2(OH)(H2O)(AsO4)](H2O)2Mon. 2/m : P21/b

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for AtencioiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.

Internet Links for AtencioiteHide

Localities for AtencioiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Brazil (TL)
 
  • Minas Gerais
    • Divino das Laranjeiras
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; http://www.universia.com.br/materia/materia.jsp?materia=2964
In Coll. M. Slama; Menezes Filho, L. A., Chaves, M. L., Cooper, M. A., Ball, N. A., Abdu, Y. A., Sharpe, R., ... & Hawthorne, F. C. (2019). Brandãoite,[BeAl 2 (PO 4) 2 (OH) 2 (H 2 O) 4](H 2 O), a new Be–Al phosphate mineral from the João Firmino mine, Pomarolli farm region, Divino das Laranjeiras County, Minas Gerais State, Brazil: description and crystal structure. Mineralogical Magazine, 83(2), 261-267.
    • Itinga
      • Taquaral
        • Piauí Valley
Gunnar Färber
 
Mineral and/or Locality  
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