... Type(PDC coring or non-coring)MediumLimestone, marble, dolomite, rhyolite, limonite, etcSteps Shaped Type, Concentric Circles ... Gneiss, White Plagioclase Gneiss, Quartz, Dolomite Marble, Black Marble, Mica, Dolomite, Alteration Angle Long Glittering Rocks, Amphibolite ... Powder Rocks, Biotite Hornblende Anorthosite, Pyroxenite through, dolomite marble, altered quartz diorite porphyry, quartz diorite, ...