Coal (most likely Bituminous or Anthracite)
Coal (primarily composed of carbon with varying amounts of other elements)
Sedimentary rock
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
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Shale
Argillaceous Sedimentary Rock
sedimentary
Siltstone or Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzose)
Arenite
sedimentary
Sandstone (Ferruginous)
Sandstone (primarily SiO2 with iron oxide cement Fe2O3)
sedimentary
River Quartzite (River Rock)
Quartzite (SiO2)
metamorphic
Sandstone (Glacial Cobble)
Arenite / Sedimentary Rock (primarily SiO2)
sedimentary
Chert / Flint Nodules in Sandstone
Microcrystalline Quartz (SiO2) within Clastic Sedimentary Rock
sedimentary
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite/Arkose)
sedimentary
Sandstone
Arenite
sedimentary
Red Sandstone
Arenite (with iron oxide cement)
sedimentary
Sandstone (with Iron Staining)
Arenite (SiO2 predominantly)
sedimentary
Sandstone
Clastic Sedimentary Rock (composed mostly of quartz and/or feldspar)
sedimentary
Diamond Druzy (Crystalline Diamond)
Carbon (C)
mineral
Quartz Grain
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Granite
Granite (Phaneritic Quartz-Feldspar rock)
igneous
Quartzite Pebble
Quartzite (SiO2-dominated rock)
metamorphic
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Sapphire (Corundum)
Corundum (Al2O3)
mineral
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Chert (specifically Blue or Grey Chert/Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Diorite
Phaneritic intermediate plutonic rock
igneous
Chert (varieties: Flint or Chalcedony)
Microcrystalline silica (SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Schist
Mica Schist (Group of medium-grade metamorphic rocks)
metamorphic
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Chert Nodule (Flint)
Chert (Cryptocrystalline Silica - SiO2)
sedimentary
Quartz-Mica Schist (with Muscovite)
Metamorphic Rock (Quartz, Muscovite, Feldspar)
metamorphic
Travertine
Terrestrial Sedimentary Calcite (CaCO3)
sedimentary
Diorite
Phaneritic intermediate plutonic rock
igneous
Pumice
Pumice (Volcanic glass with vesicular texture)
igneous
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Greenstone / Graywacke
Lithic Sandstone (Graywacke)
sedimentary
Coquina or Fossiliferous Conglomerate
Bioclastic Rudstone (variable composition)
sedimentary
Nuummite
Nuummite (ortho-amphibole rock)
metamorphic
Diabase (Dolerite) Cobble
Diabase / Dolerite
igneous