Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
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Pegmatite
Igneous Pegmatite
igneous
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Sedimentary Pebble
Sedimentary Rock Fragment
sedimentary
Unakite
Altered Granite (Epidote, Orthoclase Feldspar, Quartz)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Limestone with Fossil Fragment
Sedimentary carbonate rock (CaCO3)
sedimentary
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Sedimentary Rock (Limestone or Siltstone pebble)
Sedimentary rock fragment
sedimentary
Rhodonite
Inosilicate, (Mn,Fe,Mg,Ca)SiO3
mineral
Coal
Bituminous Coal / Anthracite
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic Glass (Amorphous silicon dioxide with impurities)
igneous
Shark Tooth Fossil
Carcharocles megalodon or similar fossilized shark tooth
fossil
Serpentine
Serpentine Group (Mg3Si2O5(OH)4)
metamorphic
Red Jasper
Silicon Dioxide (SiO2), microcrystalline quartz variety
sedimentary
K2 Stone
Azurite in Granite
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)
mineral
Pumice
Pumice (Vesicular Felsic Igneous Rock)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Chert
Microcrystalline quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Tourmaline crystal
Tourmaline Group (Complex Borosilicate)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Granite
Intrusive igneous rock
igneous
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Sedimentary rock composed mainly of calcite (CaCO3)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Bloodstone
Chalcedony quartz variety (SiO2) with inclusions
mineral
Moldavite
Tektite (Natural Silicate Glass)
gemstone
Green Aventurine
Quartz variety with fuchsite inclusions (SiO2)
mineral
Greenstone
Metabasalt / Greenschist
metamorphic
Serpentine
(Mg,Fe)3Si2O5(OH)4
metamorphic
Basalt Pebble
Extrusive Igneous Rock
igneous
Green Aventurine
Quartz (SiO2) with fuchsite inclusions
mineral
Fossil Snail
Gastropoda fossil
fossil
Connemara Marble
Calcitic Marble / Serpentinite composite
metamorphic