Granite
Intrusive igneous rock
igneous
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Mica Schist with Biotite or Muscovite
Metamorphic rock rich in sheet silicates
metamorphic
Red Sandstone
Sedimentary Quartz Arenite / Arkose
sedimentary
Basalt
Extrusive Igneous Rock
igneous
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Aventurine
Quartz (Variety Aventurine), SiO2
mineral
Fossilized Shark Tooth
Chondrichthyes tooth
fossil
Basalt Pebble
Extrusive Igneous Rock
igneous
Fossiliferous Chert or Limestone
Sedimentary rock containing fossilized marine invertebrates (likely crinoid stems or bryozoans)
sedimentary
Basalt
Mafic extrusive igneous rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite / Igneous Rock Specimen
Phaneritic Igneous Rock
igneous
Granite
Intrusive igneous rock
igneous
Quartz Boulder
Silicon Dioxide (SiO2)
mineral
Crinoid Stem Fossil
Crinoid columnal (Echinodermata)
fossil
Granite
Phaneritic Felsic Igneous Rock
igneous
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Agate / Chalcedony Geode Nodule
Silicon Dioxide (SiO2)
sedimentary
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Fossilized Tooth
Vertebrate Fossilized Tooth (Mineralized Biogenic Material)
fossil
Flint
SiO2 (Cryptocrystalline Quartz)
sedimentary
Fossil-bearing Sedimentary Rock
Sedimentum cum fossili
fossil
Sandstone
Clastic sedimentary rock (quartz arenite)
sedimentary
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Dinosaur Claw Fossil
Fossilized Theropod Claw (Vertebrate Palaeontological Specimen)
fossil
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Blue Lace Agate
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Sandstone
Quartzose Sandstone / Lithic Sandstone
sedimentary
Sandstone
Sedimentary Clastic Rock
sedimentary
Granite
Intrusive Igneous Rock
igneous
Agate
Silicon Dioxide (SiO2), microcrystalline variety of quartz
sedimentary
Granite
Intrusive igneous rock
igneous
Granite
Intrusive Igneous Rock
igneous
Agate and Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartz with Inclusions
Silicon Dioxide (SiO2)
mineral
Granite
Intrusive Igneous Rock
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary