Cryptomelane
Specimen ID:1MW-H82
Cryptomelane :K(Mn4+7Mn3+)O16
28.0cm x 12.0cm x 7.0cm
Collected by:
Photo added to mindat.org
“Dull black cryptomelane covering sandstone from the Philadelphia Mine in Little Fort Valley, Shenandoah Co., VA.”
David Fryauff (2) - 18th April 2022
Photo added to mindat.org
“Close detail of a 12.0 cm section of dull black cryptomelane showing botyroidal forms and finger-like projections.”
David Fryauff (2) - 18th April 2022No-one has added this to their favourites.
10,484,829 minIDs have been issued as of 6th Apr 2025 2:06 am UTC