Okenite Geode. Okenite is a rare, soft silicate mineral known for its delicate, fibrous, cotton-like appearance. It often forms as white or colorless tufts of fine crystals that resemble soft, featherysnowballs. Despite its fragile and fluffy look, it is technically a hydrous calcium silicate. Okenite is typically found in volcanic rock cavities, especially in basalt geodes. 8 x 6 x 7 - weighs 8 lbs