Sandstone (likely Iron-rich or Arkosic)
Arenite (SiO2 with FeO(OH) or Fe2O3 staining)
sedimentary
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Andesite
Andesite (contains Plagioclase feldspar, Pyroxene, Hornblende)
igneous
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Red Quartzite (Ferruginous Quartz)
Quartzite (SiO2 with Fe2O3 inclusions)
metamorphic
Pumice
Pumice (a highly vesicular extrusive igneous rock)
igneous
Chalk
Calcium carbonate (CaCO3)
sedimentary
Dalmatian Jasper
Aplite with Arfvedsonite inclusions
igneous
Serpentine
Serpentine group ((Mg, Fe)3Si2O5(OH)4)
metamorphic
Bauxite
Bauxite (Al2O3·2H2O mixed with iron oxides)
sedimentary
Granite
Phaneritic plutonic igneous rock (SiO2 rich)
igneous
Unakite
Epidotized Granite
metamorphic
Unakite
Unakite Epidosite (Granite with epidote and orthoclase)
metamorphic
Serpentine
Antigorite/Lizardite/Chrysotile complex: (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Quartzite with Garnet
Garnetiferous Quartzite (SiO2 + X3Y2(SiO4)3)
metamorphic
Quartzite (River Pebble)
SiO2 (recrystallized Quartz)
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Granite
Granite
igneous
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Dalmatian Jasper
Dalmatian Stone (a microcrystalline quartz and feldspar rock with arfvedsonite)
igneous
Olivine (Peridotite)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
igneous
Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Sandstone (River Rock)
Arenite (SiO2 principal component)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary
Garnet Schist or Garnet-bearing Quartzite
Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)
metamorphic
Chert (Quartz Variety)
Chert (mostly SiO2 / Silicon Dioxide)
sedimentary
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Drill Core Sample
Cylindrical Rock Core (Specific mineralogy varies by extraction site)
Metamorphic (Likely Gneiss or Schist based on texture)
Orthoclase Feldspar
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Basalt with Quartz Veins
Amygdaloidal Basalt (matrix) with Crystalline SiO2 (veins)
igneous
Granite
Granite
Igneous
Sandstone (likely Calcareous or Micaceous)
Clastic sedimentary rock (primarily Quartz with Cementing Agents)
sedimentary
Sandstone (likely Graywacke or Arkosic varieties)
Arenite (composed primarily of SiO2)
sedimentary
Basalt
Basalt (extrusive igneous rock)
Igneous
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
Sandstone (likely Red/Brown Sandstone)
Arenite (SiO2 based)
sedimentary
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
River Rock (Gneiss/Schist mix)
Foliated Metamorphic Rock (Gneiss)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Limestone
Calcareous sedimentary rock (primarily CaCO3)
sedimentary
Basalt (River Pebble)
Extrusive Mafic Igneous Rock
igneous