“Field of view ca. 7 mm. This is from the first sample I colleted in 1983 and it remained unidentified for several years. Found just SW of Castillo at low tide in beach gravel. Zeolite collection of Volker Betz.”

“Field of view ca. 4 mm. This is from the first sample I collected in 1983 and it remained unidentified for several years. Found just SW of Castillo at low tide in beach gravel. Zeolite colletion of Volker Betz.”