Unakite
Altered Granite (Epidote, Pink Orthoclase Feldspar, and Quartz)
metamorphic
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Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Green Aventurine
Quartz (SiO2) with fuchsite inclusions
mineral
Red Quartzite
Quartzite (SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz (Agate/Jasper pebble)
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Schist
Metamorphic Schist
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Serpentine
Serpentine group (e.g., Antigorite, Chrysotile, Lizardite) - (Mg,Fe)3Si2O5(OH)4
metamorphic
Ironstone / Weathered Hematite
Iron oxide-rich sedimentary rock with Goethite/Hematite
sedimentary
Fossil Shark Tooth
Chondrichthyes dentition (Fossilized Tooth)
fossil
Granite
Felsic intrusive igneous rock
igneous
Basalt Fragment
Extrusive Igneous Rock
igneous
Hematite
Hematite (Fe2O3)
mineral
Chert / Flint (Artifact)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Milky Quartz with Tourmaline
Silicon Dioxide (SiO2) with Tourmaline inclusions
mineral
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Green Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Hematite
Hematite (Fe2O3)
mineral
Unakite (Granite)
Altered Granite (Orthoclase, Epidote, Quartz)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Amber with Fossil Inclusion
Fossilized Tree Resin (Succinite)
fossil
Granite with Mafic Xenolith
Intrusive Igneous Rock (Felsic to Intermediate)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Scoria
Vesicular Mafic Igneous Rock
igneous
Granite with Mafic Xenolith
Intrusive Igneous Rock containing a Xenolith
igneous
Basalt
Extrusive igneous rock
igneous
Greenstone
Metamorphic mafic rock (chlorite-actinolite-epidote schist)
metamorphic
Granite
Felsic Plutonic Igneous Rock
igneous
Quartz (Agate/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Argillite
Argillite (Fine-grained sedimentary rock composed mostly of clay-sized particles)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Prehnite
Ca2Al(AlSi3O10)(OH)2
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Hematite
Hematite (Fe2O3)
mineral