Allophane : (Al2O3)(SiO2)1.3-2·2.5-3H2O
Brochantite : Cu4(SO4)(OH)6
As recorded:
New East Wheal Russell, Gulworthy, West Devon, Devon, England, UK
33mm x 18mm x 17mm
Photo added to mindat.org
“Light blue, botryoidal allophone coating small quartz crystals with associated dark green brochantite.
Specimen/photo - Trevor Boyd/Causeway Minerals.”
Trevor Boyd - 5th January 2024
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