stromatolite from the Weitzschkerbach valley near Querfurt, Saxony-Anhalt
Fig.3: same as Fig.2, another cut
face revealing a vug with calcite scalenohedrons,
other samples contained small quartz crystals in addition to the calcite,
size about 130 x 60 mm, coll. and photograph by H.HUHLE/Roeblingen.