There are 3 specimens here from this unique find in 2005 at the 2nd Sovietskiy Mine in Dalnegorsk. What you have is poker-chip calcites (to 4 cm) which are covered with small, sparkling crystals of apophyllite. The apophyllites also are lighting up the surrounding matrix, with a dove-grey color coming through from the underlying (unidentified) mineral, which creates a wonderful contrast with the calcites.