description Plancheite Overview
Plancheite is a rare hydrated copper silicate mineral with the ideal formula Cu8Si8O22(OH)4·H2O. It is typically pale to deep blue or blue-green and commonly occurs as rounded concretions, spherules, or tightly fibrous and sometimes asbestiform aggregates rather than as large transparent crystals. The mineral was described in 1908 and is associated with oxidized copper deposits, especially at its type locality near Mindouli in the Republic of the Congo; collectors value it mainly as a mineral specimen.
help Plancheite FAQ
What is plancheite?
Plancheite is a rare hydrated copper silicate mineral. Its ideal formula is Cu8Si8O22(OH)4·H2O.
What color is plancheite?
Plancheite is typically pale blue to deep blue or blue-green. The color comes from its copper-bearing composition.
What does plancheite look like in specimens?
It commonly occurs as rounded concretions, spherules, or tightly fibrous aggregates. Some material is asbestiform rather than made of large individual crystals.
Where does plancheite form?
Plancheite is associated with copper-bearing geological environments. Its fibrous aggregates and blue color help distinguish it from some other copper silicate minerals.
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