Cupro-Allophane

Field of view: 5 mm. A dendritic group of cupro-allophane. Blue allophane is covered with dirt. Allophane is colored blue by Cu contamination. The red parts are limonite.

Recovered from a meteoric oxidation zone of a moderately high-temperature hydrothermal deposit associated with welded tuff. Formed in less than 50 years after the mine was closed,

Cupro-Allophane from this location was described in 1982.