Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Category
Anthropogenic (Man Made Material)
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Quartz Pebble with Chlorite or Epidote Inclusions
Silicon Dioxide (SiO2) with inclusions
metamorphic
Mica Schist
Schist
metamorphic
Sandstone (Calcareous)
Clastic sedimentary rock (primarily SiO2 with CaCO3 cement)
sedimentary
Unakite
Unakite (metamorphosed granitic rock)
metamorphic
Fossiliferous Sandstone with Plant Remains
Arenite with Carbonaceous impressions (likely Paleozoic/Mesozoic Flora)
sedimentary
Coarse-grained Granite
Granitoid (Felsic Plutonic Rock)
igneous
Sandstone
Arenite (SiO2 with various cementing agents)
sedimentary
Pink Granite
Phaneritic Plutonic Igneous Rock (high K-feldspar)
igneous
Porphyritic Rhyolite (Birdseye Rhyolite)
Rhyolite (Porphyritic texture)
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Granite
Granite
Igneous
Quartzite Geode or Crystalline Quartz Node
Silicon Dioxide (SiO2)
metamorphic
Sandstone (Pebble)
Arenite (SiO2 based)
sedimentary
Granite
Phaneritic plutonic rock (Quartz + Feldspar + Mica)
igneous
Fossil gastropod shell
Fossilized marine gastropod; exact genus/species requires locality and examination
fossil
Sandstone
Arenite
sedimentary
Diamond (in Jewelry)
Diamond (Carbon, C)
mineral
Quartz vein in Schist
Crystalline Silicon Dioxide (SiO2) in Metamorphic Host
metamorphic
Quartzite in Conglomerate
Clastic Sedimentary Rock with Silicon Dioxide (SiO2) inclusions
sedimentary
Diamond (Emerald Cut)
Carbon (C)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Sedimentary Clastic Rock (Quartz-rich)
sedimentary
Quartzite / Iron-stained Chert
Silicon Dioxide (SiO2) with Iron Oxide impurities
metamorphic
Gravel / Small Pebble
Rock Fragment (Gravel)
sedimentary
Sandstone
Sandstone (SiO2 with iron oxides and clay)
sedimentary
Pebble / Rounded Rock
Lithic fragment / Water-worn rock
sedimentary
Sandstone (Pebble / Cobble)
Arenite / Sedimentary Rock (composed of quartz and feldspar)
sedimentary
Quartz (Iron-Stained / Yellow Quartz)
Silicon Dioxide (SiO2)
mineral
Chiastolite
Andalusite variety Chiastolite
mineral
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Potassium-Rich Silicate Clay (inferred from biological context)
Phyllosilicate group (likely Illite or Smectite within surrounding soil substrate)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sedimentary Sandstone (Sandstone Slab)
Arenite (SiO2 with Fe2O3 staining)
sedimentary