Structures
(WP: Travertine is a sedimentary rock. It is a natural chemical precipitate of carbonate minerals; typically aragonite, but often recrystallized to, or primarily, calcite….
nice collection …. , found on Am Nordbahnhof, Berlin)
(WP: Travertine is a sedimentary rock. It is a natural chemical precipitate of carbonate minerals; typically aragonite, but often recrystallized to, or primarily, calcite….
nice collection …. , found on Am Nordbahnhof, Berlin)