General Information:
Chemical Formula:
Cu++18Al2(AsO4)3(SO4)3(OH)27·33(H2O)
Composition:
(Molecular Weight = 3,010.49 gm)
Aluminum 1.79 % Al
Copper 37.99 % Cu
Arsenic 7.47 % As
Hydrogen 3.31 % H
Sulfur 3.20 % S
Oxygen 46.24 % O
Empirical Formula:
Cu18Al2(AsO4)3(SO4)3(OH)27·36(H2O)
Name Origin:
From the Greek, "copper" and fyllon, "leaf."
Physical Properties:
Cleavage:
[0001] Perfect
Color:
emerald green, bluish green, or grass green.
Density:
2.4 - 2.66, Average = 2.53
Diaphaniety:
Transparent to translucent
Habits:
Platy - Sheet forms (e.g. micas)., Tabular - Form dimensions are thin in one direction., Massive - Lamellar - Distinctly foliated fine-grained forms.
Hardness:
2 - Gypsum
Luminescence:
None.
Luster:
Vitreous - Pearly
Streak:
pale green
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