Synthetic (Not A Rock Or Mineral)

Sandstone

Arenite (primarily SiO2, silica)

Basalt River Stone

Basalt

Granite

Granite (Alkali-feldspar, Quartz, and Plagioclase composition)

Ferruginous Sandstone (with possible Epidote/Chlorite coloring)

Sandstone (SiO2 dominated with Fe2O3 staining)

Ferruginous Sandstone

Clastic Sedimentary Rock (Iron-rich)

Shale (with minor calcite veining)

Clastic sedimentary rock (primarily clay minerals and quartz)

Shale

Shale (Consolidated fine-grained clay/silt)

Dalmatian Jasper

Peralkaline rhyolite with Arfvedsonite inclusions

Quartzite

Quartzite (primarily SiO2)

Fossil Shell (Bivalve)

Class Bivalvia (Likely a member of the Ostreidae or Gryphaeidae family), CaCO3

Slate

Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)

Sandstone

Arenite (SiO2 based)

Basalt

Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)

Quartzite (specifically Milky Quartz variety)

Quartz (SiO2)

Gneiss (Metamorphic Rock)

Gneiss

Garnetiferous Quartzite (Garnet Gneiss Pebble)

Garnet-bearing Quartzite or Quartz-Feldspar Gneiss

Jasper

Silicon dioxide (SiO2)

Granite

Granite (Mainly Quartz, Feldspar, and Mica)

Vesicular Basalt

Basalt with secondary mineral infilling (Amygdaloidal Basalt)

Amygdaloidal Basalt with Secondary Minerals

Basalt containing secondary mineralization (likely Chlorite, Celadonite, or Zeolites)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Hematite

Iron(III) oxide (Fe2O3)

Ferruginous Quartz

Quartz (Silicon Dioxide) with Iron Inclusion, SiO2

Chlorastrolite (Greenstone)

Chlorastrolite (variety of Pumpellyite) - Ca2(Mg,Fe)Al2(SiO4)(Si2O7)(OH)2 · H2O

Sandstone (likely Graywacke or Arkose variant)

Clastic Sedimentary Rock (SiO2 with assorted lithic fragments)

Agate (Geode nodule)

Cryptocrystalline Quartz (SiO2)

Granite

Intrusive igneous felsic rock

Granite

Phaneritic plutonic rock (Felsic)

Marble

Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)

Vesicular Basalt with Xenocrysts

Mafic Igneous Plutonic/Extrusive Complex

Geode (Unopened)

Silica-rich concretion (SiO2)

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Dragon Blood Jasper

Epidote-containing Quartz Chalcedony (SiO2 with Ca2(Al, Fe)3(SiO4)3(OH))

Granite

Granite (Phaneritic igneous rock)

Schist (Micaceous Schist)

Schist (containing mainly Muscovite and Quartz)

Limestone

Calcium Carbonate (CaCO3)

Quartz Vein in Gneiss or Basalt

Milky Quartz (SiO2) within Metamorphic Host Rock

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Tree Agate (or Moss Agate)

Dendritic Agate (Silicon Dioxide - SiO2)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated Iron Oxide)