Category Sulfate Space group C2/m | Crystal system Monoclinic | |
Formula
(repeating unit) K0.8Mn0.6[(UO2)2O2(SO4)]•3.5H2O Crystal class Prismatic (2/m)
(same H-M symbol) Unit cell a = 8.63, b = 14.28,
c = 8.86 [Å], β = 104.04° (approximated) | ||
Plavnoite is a very rare complex uranium sulfate mineral with the formula K0.8Mn0.6[(UO2)2O2(SO4)]•3.5H2O. Typically for the secondary uranium mineral, plavnoite contains uranyl groups. It was discovered in the Plavno mine in Jáchymov, Czech Republic. The Jáchymov site is known as a type locality for many rare and unique minerals.
Relation to other minerals
Although related to zippeite, plavnoite is chemically unique.
References
Plavnoite Wikipedia(Text) CC BY-SA