General Information:
Chemical Formula:
Fe++3(AsO4)2·8(H2O)
Composition:
(Molecular Weight = 589.50 gm)
Iron 28.42 % Fe
Arsenic 25.42 % As
Hydrogen 2.74 % H
Oxygen 43.42 % O
Empirical Formula:
Fe3+3(AsO4)2·8(H2O)
Name Origin:
From the Greek, syn, "together" and plesiazein, "to associate."
Physical Properties:
Cleavage:
[010] Perfect
Color:
blue, greenish black, gray green, light blue, or light green.
Density:
2.96 - 3, Average = 2.98
Diaphaniety:
Transparent to Translucent
Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Crystalline - Fine - Occurs as well-formed fine sized crystals., Earthy - Dull, clay-like texture with no visible c rystalline affinities, (e.g. howlite).
Hardness:
2.5 - Finger Nail
Luster:
Vitreous - Pearly
Streak:
bluish white
More details...