Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Category
Biogenic Material
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Sandstone (Lithic Arenite)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Granite Cobble
Granite (Phaneritic igneous rock)
igneous
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Chert (Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite with inclusions
Metamorphic Quartzite (SiO2)
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Chert (Mookaite style)
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Sandstone (Quartzose)
Arenite
sedimentary
Coquina
Coquina Limestone (CaCO3)
sedimentary
Sandstone nugget
Arenite (primarily Quartz SiO2)
sedimentary
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based sedimentary rock)
sedimentary
Travertine (or Calcareous Tufa)
Calcium Carbonate (CaCO3)
sedimentary
River Siltstone Pebble
Siltstone (composed mainly of silt-sized quartz and feldspar)
sedimentary
Travertine
Travertine (CaCO3)
sedimentary
Chert (Jasper/Common Opal mix)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (with Limonite staining)
Arenite (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Sandstone (Yellow/Siltstone variant)
Arenite (SiO2 primarily)
sedimentary
Quartz (Milky or Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Red Sandstone
Arenite (Iron-rich)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone
Arenite
sedimentary
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (with Lichen)
Arenite (composed primarily of SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (with iron oxide cement)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Sandstone
Arenite (primarily SiO2 - Silicon Dioxide)
sedimentary
Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Quartzite
SiO2 (Metamorphosed Sandstone)
metamorphic