General Information:
Chemical Formula:
(Mg,Fe++)3(Al,Fe+++)4(PO4)4(OH)6·2(H2O)
Composition:
(Molecular Weight = 729.00 gm)
Magnesium 8.33 % Mg
Aluminum 12.95 % Al
Iron 7.66 % Fe
Phosphorus 17.00 % P
Hydrogen 1.38 % H
Oxygen 52.67 % O
Empirical Formula:
Mg2.5Fe2+0.5Al3.5Fe3+0.5(PO4)4(OH)6·2(H2O)
Environment:
Forms a series with gormanite.
Locality:
Linopolis district, N of Dimino das Laranjeiras, Minas Gerias, Brazil.
Name Origin:
Named for J. A. De Souza (1896-1961), director of Departamento Nacional de Producao Minera, Brazil.
Physical Properties:
Cleavage:
[001] Indistinct, [1] Fair
Color:
blue green or dark green.
Density:
3.087
Diaphaniety:
Translucent
Habits:
Crystalline - Coarse - Occurs as well-formed coarse sized crystals., Massive - Fibrous - Distinctly fibrous fine-grained forms.,
Hardness:
5.5-6 - Knife Blade-Orthoclase
Luster:
Vitreous (Glassy)
Streak:
white
More details...