Sandstone (Ferruginous)
Arenite (Fe2O3 enriched)
sedimentary
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
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Fossil Shell (Bivalve)
Class Bivalvia (fossilized)
fossil
Sandstone
Sandstone (Quartzose/Feldspathic Sandstone)
sedimentary
Vesicular basalt (scoria-like volcanic rock)
Basalt; primarily plagioclase, clinopyroxene, and olivine, with abundant vesicles
igneous
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Fossiliferous Sandstone (with Brachiopod or Bivalve mold)
Clastic Sedimentary Rock with Macrofossil Mold
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Flint)
SiO2 (Microcrystalline Quartz)
sedimentary
Sandstone (Red Sandstone)
Arenite (SiO2 based with Fe2O3 staining)
sedimentary
Dendritic Agate (Tree Agate)
Chalcedony (Silicon Dioxide, SiO2) with Manganese or Iron Oxide inclusions
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Serpentinite
Serpentinite (composed mainly of Group: Serpentine; (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Epidote with Unakite characteristics
{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
metamorphic
Scoria
Extrusive Basaltic Scoria
igneous
Sandstone with Foliose Lichen
Arenite (Rock matrix) with Xanthoparmelia or Flavoparmelia (Lichen genus)
sedimentary
Chert (Arrowhead)
Chert (primarily Microcrystalline Silica, SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Sandstone (Quartz Arenite)
Clastic Sedimentary Rock - Quartz Arenite
sedimentary
Milky Quartz with Mineral Inclusions
Silicon Dioxide (SiO2)
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Rough Diamond
Diamond (pure carbon, C)
mineral
Sandstone
Arenite
sedimentary
Sandstone pebble
Sandstone (siliciclastic sedimentary rock)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Turtleback Rock (Brecciated Diabase / Granite)
Brecciated hypabyssal intrusive rock
igneous
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert (Nodule)
Silicon dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Sandstone
Arenite (predominantly SiO2 with iron oxides)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Sandstone (SiO2 dominated clastic sedimentary rock)
sedimentary
Greenish Feldspathic Rock / Epidote Granite (Unakite-type or Epidote-bearing rock)
Epidotized Metamorphic/Igneous Rock
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
River Cobble (Quartzite or Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Fossil Coral in Limestone
Scleractinia (Anthomastodon or similar) in Sedimentary Calcarenite
fossil
Mica Schist
Schist (muscovite-biotite schist)
metamorphic
Milky Quartz (among River Rock)
Quartz (Silicon Dioxide, SiO2)
Mineral
Banded Sandstone
Arenite (Sandstone with iron oxide banding)
sedimentary
Fossil coral fragment
Likely calcitic colonial coral, possibly fossilized scleractinian coral
fossil
White Marble
Recrystallized Calcite (CaCO3)
metamorphic