Basalt
Basalt (Mafic volcanic rock)
igneous
Category
Not A Rock (Synthetic Material)
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Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Scoria (Basaltic Lava Rock)
Vesicular Basalt
igneous
Milky Quartz with Matrix
Silicon Dioxide (SiO2)
mineral
Weathered vesicular stone, possibly pumice or scoria
Vesicular volcanic rock; likely pumice (highly vesicular rhyolitic material) or scoria (basaltic material)
igneous
Sandstone (Water-worn Pebble)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Banded Gneiss
Gneiss (Metamorphic high-grade rock)
metamorphic
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (with Arkose characteristics)
Clastic sedimentary rock (SiO2 with KAlSi3O8)
sedimentary
Decomposed Granite
Grano-diorite/Granite-residuum (SiO2 primary)
igneous
Serpentinite
Serpentinite (Hydrated magnesium iron phyllosilicate)
metamorphic
Sandstone with Quartz Vein
Arenite with hydrothermal quartz intrusion
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Sandstone (clastic sedimentary rock, composed predominantly of sand-sized minerals or rock fragments)
Sedimentary Rock
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Sandstone (with potential fossil inclusions)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Pumice
Pumice (a highly vesicular volcanic rock)
igneous
Sandstone (Ferruginous)
Arenite with Iron Oxide staining (Fe2O3)
sedimentary
Sodalite
Sodalite (Na4Al3Si3O12Cl)
Mineral
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Chert (SiO2)
sedimentary
Chert
Chert (SiO2)
sedimentary
Chert (specifically Gray Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Silicon dioxide (SiO2)
sedimentary
Tumbled cream-colored stone, likely quartzite or limestone
Probably quartzite (microcrystalline SiO₂); limestone alternative: calcite (CaCO₃)
metamorphic
Quartzite
Metamorphic quartz rock (SiO2)
metamorphic
Turtleback Rock (Brecciated Diabase / Granite)
Brecciated hypabyssal intrusive rock
igneous
Granite (Unakite / Pink Feldspar Granite)
Granite (Plutonic Igneous Rock)
igneous
Granite (Pink/Alkali Feldspar Granite)
Plutonic Igneous Rock (Granite)
igneous
River Rock (Sandstone or Quartzite)
Clastic Sedimentary Rock / Quartzite
sedimentary
Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Diorite
Phaneritic intermediate plutonic rock
igneous
Phyllite
Phyllite (Foliated metamorphic rock)
metamorphic
Diorite
Phaneritic intermediate plutonic rock
igneous
Diorite (River Cobble)
Phaneritic intermediate plutonic rock
igneous
Siltstone
Siltstone (Clastic Sedimentary Rock)
sedimentary
Gabbro (River Cobble)
Gabbro (mafic intrusive rock)
igneous
Coal
Anthracite / Bituminous Coal
sedimentary