Hematite
Hematite (Fe2O3)
mineral
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Chalcopyrite
CuFeS2 (Copper Iron Sulfide)
mineral
Sandstone with Iron Oxide Concretions
Quartzose Sandstone with Limonite/Hematite
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Raw Quartz
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Fossilized Crinoid Stem
Crinoidea (Echinodermata)
fossil
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Fluorite
Calcium Fluoride (CaF2)
mineral
Aventurine
Quartz (SiO2) with fuchsite inclusions
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sunstone
Feldspar (Oligoclase)
mineral
Red Jasper with Quartz Veining
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Green Sea Glass
Man-made silicate glass (weathered)
sedimentary
Carnelian Ring
SiO2 (Variety of Chalcedony)
gemstone
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Carnelian
Silicon Dioxide (Chalcedony variety), SiO2
mineral
Peridotite
Ultramafic intrusive igneous rock
igneous
Dumortierite in Quartz
Silicon Dioxide with Aluminium Borosilicate (SiO2 + (Al,Fe7+)7(BO3)(SiO4)3O3)
mineral
Serpentinite
Serpentinite (Hydrated magnesium iron phyllosilicate)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Green Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Quartz Vein Rock
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Lepidolite
K(Li,Al)3(Al,Si,3O10)(F,OH)2
mineral
Carnelian
SiO2 (Quartz variety)
gemstone
Chert
Silicon Dioxide (Microcrystalline Quartz, $SiO_2$)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Gossan / Iron Ore Rock
Hematite / Goethite / Limonite iron oxide assemblage
mineral
Carnelian
Silicon Dioxide (Variety of Chalcedony, SiO2)
gemstone
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Lava Rock (Dyed)
Basalt / Volcanic scoria
igneous
Pegmatite
Igneous Pegmatite (Quartz, Feldspar, Micas)
igneous
Granite
Felsic intrusive igneous rock
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Jasper (or possibly Agate/Chalcedony) beads
SiO2 (Silicon Dioxide)
mineral