General Information:
Chemical Formula:
(Al,Y)Cu6(AsO4)3(OH)6·3(H2O)
Composition:
(Molecular Weight = 999.68 gm)
Yttrium 2.67 % Y
Aluminum 1.89 % Al
Copper 38.14 % Cu
Arsenic 22.48 % As
Hydrogen 1.21 % H
Oxygen 33.61 % O
Empirical Formula:
Al0.7Y0.3Cu6(AsO4)3(OH)6·3(H2O)
Environment:
Al analog of agardite.
IMA Status:
Approved IMA 1978
Locality:
Majuba Hill mine, Pershing County, Nevada, USA.
Name Origin:
Named for Hatfield Goudey (1906-1985), mining geologist and mineral collector of San Mateo, California, USA.
Physical Properties:
Cleavage:
[100] Perfect, [001] Good
Color:
colorless or yellow green.
Density:
3.5
Diaphaniety:
Transparent
Habits:
Acicular - Occurs as needle-like crystals., Hexagonal - Six-sided crystal shape in cross-section or habit.,
Hardness:
3-4 - Calcite-Fluorite
Luster:
Vitreous (Glassy)
Streak:
greenish white
More details...