Granite Cobble
Intrusive Igneous Rock (Quartz, Feldspar, Mica)
igneous
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Granite
Felsic intrusive igneous rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Mossy Rock
Mixed lithology rock with Bryophyta (moss)
sedimentary
Fossil Shark Tooth
Chondrichthyes (class)
fossil
Jade Bangle (Jadeite)
Jadeite, NaAlSi2O6
gemstone
Flint / Chert
Cryptocrystalline quartz (SiO2)
sedimentary
Chert Nodule in Limestone
Sedimentary rock comprising microcrystalline quartz (chert) and calcium carbonate (limestone)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Angel Skin Coral
Corallium rubrum / Corallium spp. (Calcium Carbonate, CaCO3)
gemstone
Ruby and Sapphire Cluster Ring
Corundum (Al2O3)
gemstone
Black Onyx
Chalcedony (SiO2)
gemstone
Charoite
(K,Na)5Ca6Si12O30(OH,F)·nH2O
mineral
Limonite
FeO(OH)·nH2O
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Granite with Biotite Inclusions
Intrusive Igneous Rock (Quartz, Feldspar, Biotite)
igneous
Epidote
Epidote (Ca2(Al, Fe)3(SiO4)3(OH))
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Pumice
Pumice (Volcanic glass / Felsic igneous rock)
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Peridot
Olivine ((Mg, Fe)2SiO4)
gemstone
Granite
Intrusive Igneous Rock
igneous
Green Quartz
Silicon Dioxide (SiO2)
mineral
Iron Ore / Hematite Rock
Iron oxide (primarily Hematite, Fe2O3)
mineral
Diamond
Carbon (C)
mineral
Basalt
Extrusive Igneous Rock
igneous
Granite
Granite (felsic intrusive igneous rock)
igneous
Sea Glass
Man-made silicate glass weathering product
sedimentary
Carnelian
Silicon dioxide (chalcedony variety), SiO2
gemstone
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Peach / Hematoid Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Clastic Rock (Quartzose Sandstone)
sedimentary
Gneiss
Gneiss
metamorphic
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Quartz pebble
Silicon dioxide (SiO2)
mineral
Quartz Geode or Druzy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Carnelian
Silicon Dioxide (Quartz variety), SiO2
mineral
Red Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Sandstone
Sedimentary rock composed mainly of quartz sand
sedimentary
Iron-Stained Quartz
Silicon Dioxide (SiO2) with Iron Oxide/Limonite coating
mineral
Gneiss
Gneiss
metamorphic