General Information:
Chemical Formula:
(Cu,Al)2H2Si2O5(OH)4·n(H2O)
Composition:
(Molecular Weight = 460.08 gm)
Aluminum 1.47 % Al
Silicon 24.42 % Si
Copper 24.17 % Cu
Hydrogen 1.26 % H
Oxygen 48.69 % O
Empirical Formula:
Cu1.75Al0.25H1.75(Si2O5)2(OH)4
Environment:
Mineral of secondary origin commonly associated with other secondary copper minerals.
IMA Status:
Accepted IMA 1968
Locality:
Nizhne-Tagilsk, Ural Mountains, Russial
Name Origin:
Named from the Greek chrysos - "gold" and kolla - "glue" in allusion to the name of the material used to solder gold.
Physical Properties:
Cleavage:
None
Color:
green, bluish green, blue, blackish blue, or brown.
Density:
2 - 2.4, Average = 2.2
Diaphaniety:
Translucent to opaque
Habits:
Botryoidal - "Grape-like" rounded forms (e.g.. malachite)., Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite)., Stalactitic - Shaped like pendant columns as stalactites or stalagmites (
Hardness:
2.5-3.5 - Finger Nail-Copper Penny
Luminescence:
None.
Luster:
Vitreous - Dull
Streak:
light green
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