Granite
Felsic intrusive igneous rock
igneous
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Tumbled Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Felsic intrusive igneous rock
igneous
Graphite
Carbon (C)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Pumice
Pumice (Volcanic Rock)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Ammonite Fossil
Ammonoidea
fossil
Ammonite Fossil
Ammonoidea
fossil
Sunstone
Feldspar group (Plagioclase / Oligoclase)
mineral
Fossil Shark Tooth
Chondrichthyes (class)
fossil
Amethyst
Silicon Dioxide (Quartz variety), SiO2
mineral
Sea Glass
Man-made silicate glass
gemstone
Sandstone
Sedimentary quartz arenite
sedimentary
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Granite
Intrusive Igneous Rock
igneous
Basalt Pebble
Extrusive Igneous Rock
igneous
Quartz pebble
Silicon dioxide (SiO2)
mineral
Sandstone
Quartz Arenite / Clastic Sedimentary Rock
sedimentary
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Quartz with Tourmaline Inclusions
Silicon Dioxide with complex boro-silicate (SiO2 + Na(Fe3+Al6)(BO3)3Si6O18(OH)4)
mineral
Fossilized Bivalve Shell
Class Bivalvia (fossilized)
fossil
Quartz
Silicon Dioxide (SiO2)
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb,Cs)4O10(F,OH)2
mineral
Dumortierite in Quartz
Dumortierite (Al6O3(BO3)(SiO4)3) with Quartz (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Lepidolite
K(Li,Al)3(Al,Si,IV)4O10(F,OH)2
mineral
Lepidolite
K(Li,Al)3(Al,Si,3O10)(F,OH)2
mineral
Amygdaloidal Basalt with Agate/Zeolite Amygdules
Basalt (extrusive igneous rock) containing secondary mineral fillings
igneous
Amygdaloidal Basalt
Extrusive Igneous Rock with Amygdules
igneous
Quartz with Tourmaline or Amphibole
Silicon Dioxide with silicate inclusions (SiO2)
mineral
Red Jasper
Microcrystalline Quartz (SiO2) with iron oxide inclusions
sedimentary
Prehnite
Ca2Al(AlSi3O10)(OH)2
mineral
Citrine
Silicon Dioxide (Quartz variety), SiO2
mineral
Granite
Intrusive Igneous Rock
igneous