Retzian-(La)

General Information:
 Chemical Formula:
(Mn,Mg)2(La,Ce,Nd)(AsO4)(OH)4
 Composition:
(Molecular Weight = 441.31 gm)
Lanthanum 18.89 % La
Cerium 9.52 % Ce
Magnesium 2.75 % Mg
Manganese 18.67 % Mn
Arsenic 16.98 % As
Hydrogen 0.91 % H 
Neodymium 3.27 % Nd
Oxygen 29.00 % O 
 Empirical Formula:
Mn2+1.5Mg0.5La0.6Ce0.3Nd0.1(AsO4)(OH)4
 IMA Status:
Approved IMA 1983
Physical Properties:
 Cleavage:
None
 Color:
reddish brown.
 Density:
4.49
 Diaphaniety:
Subtranslucent
 Hardness:
3-4 - Calcite-Fluorite
 Luster:
Vitreous (Glassy)
 Streak:
brownish white
More details...