Igloo models are used for splitting:
MONOLITH STONES:
BASALT, DIORITE, ANDESITE, TRACHYTE, GABBRO, LABRADORITE, PORPHIRITE, SYENITE, SANDSTONE, LIMESTONE, DOLOMITE, SERIZZO, MARBLE, TRAVERTINE, LAVA, RHYOLITES, BRECCIA, PHYLLITE, OTHER MONOLITHIC STONES.
STRATIFIED ROCKS:
SLATE, STRATIFIED SANDSTONES, SCHIST BASALT, STRATIFIED GNEISS, GNEISS, QUARTZITE, STRATIFIED PORPHYRY, SERPENTINE, SCHIST.