Plancheite
Plancheite
– Cu8(Si4O11)2(OH)4·H2O
Orthoclase
Talc (1)Diamond (10)
Scratches glass. Harder than a steel knife.
Did you know?
Plancheite and shattuckite are two blue copper silicates so alike that for years no one was sure they were different minerals. They were described, declared identical, then split apart again, and only careful chemistry finally settled that they are truly two species.