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Lapis Lacedaemonius (), also known as Spartan basalt, is a form of andesite or volcanic rock known today only from a single source in the village of Krokees on the Peloponnese in Greece. In addition, ancient sources mention a quarry of lapis Lacedaemonius in Taygetus. The stone has a dark green colour, speckled with elements shifting from yellow to light green. Occasionally, the speckles have crystallised in a way that creates rosette-like patterns. It is rated as having a hardness of six or higher on the Mohs scale of mineral hardness. It appears in comparatively small blocks. It is known in Italian as "porfido verde antico" and in German as "Krokeischer Stein".