Mineral Information and Data:

Atencioite
Ca2Fe2+3Mg2Be4(PO4)6(OH)4 • 6H2O [CNMNC approved formula]

Named for Dr. Daniel Atencio, professor of mineralogy at the Geoscience Institute of the University of São Paulo, Brazil.

IMA status : Approved Species 2006 (IMA2004-041)
CLASSIFICATION 
Dana
(8th edition) :
42.07.07.05  (This Dana# Added)
  (42) Hydrated Phosphates Containing Hydroxyl or Halogen
  (42.07) where (AB)5 (XO4)3 Zq · x(H2O)
  (42.07.07) Roscherite group
  
Nickel-Strunz
(10th edition) :
08.DA.10
  (08) Phosphates, Arsenates, Vanadates
  (08.D) Phosphates, etc
  (08.DA) With small (and occasionally larger) cations
  
Crystal system: Triclinic System
Point group (H-M): 1 — pinacoidal
Unit cell: a = 6.668(1) Å, b = 9.879(2) Å, c = 9.883(1) Å; α = 73.53(1), β = 85.60(1), γ = 86.93(1)°; V = 622.8(4) Å;
Crystal Habit: Forms groups of sub-parallel individuals and spherules up to 8 mm
  
Color: Greenish-brown
Diaphaneity: Transparent
Luster: Vitreous
Hardness (Mohs): 4.5
Measured Density: 2.84 g/cm3
Tenacity: Brittle
Streak: White
  
Geologic Setting: Occurs in granite pegmatite at Linópolis, Divino das Laranjeiras, Minas Gerais State, Brazil
Mineral Association: Albite, quartz, lepidolite, beryllonite, moraesite and ushkovite (Linópolis, Divino das Laranjeiras, Minas Gerais State, Brazil)
  

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