Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of Cellulose)
fossil
Category
Anthropogenic (Man Made Material Processed By Nature)
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Quartz (worked as a tool or artifact)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement)
fossil
Pebble
Clast (specifically a granule or small pebble)
Sedimentary
Chert (Flint Nodules)
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Serpentine / Serpentinite (with Weathering Crust)
Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Shale (possibly)
Shale (fine-grained clastic sedimentary rock)
sedimentary
Red Jasper
Jasper (a variety of Chalcedony, SiO₂ with iron oxide inclusions)
Mineral
Red Sandstone (Iron-rich)
Ferruginous Sandstone (SiO2 with Iron Oxides)
sedimentary
Gold
Aurum (Elemental Gold, Au)
Mineral, Metal (element)
Quartzite with Iron Inclusions
Quartzite (SiO2 with Fe2O3 impurities)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
fossil
Green Aventurine
Quartz containing Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone
Sandstone (clastic sedimentary rock, predominantly SiO2)
sedimentary
Rose quartz beads
Quartz, silicon dioxide (SiO₂), pink variety
mineral
Peridotite (Dunite/Lherzolite)
Ultramafic Peridotite
igneous
Chert (Jasper/Pink Chert)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Water-worn Cobble)
Arenite (variable composition, primarily SiO2)
sedimentary
Seashell Fossil
Invertebrate fossil (phylum Mollusca)
fossil
Red Jasper
Microcrystalline Quartz (SiO2 with Iron Oxide impurities)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Fossilized Wood (with Coal and Limonite)
Petrified Wood (Silicified or Carbonized Flora)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Chalcedony or Quartz, SiO2)
sedimentary
Petrified Wood (Agatized/Silicified Wood)
Silicified Wood / Chalcedony (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Schist
Mica Schist
metamorphic
Quartz River Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Porphyritic Basalt (Chinese Writing Stone or Flower Stone)
Porphyritic Basalt / Porphyry
igneous
Snowflake Obsidian
Obsidian (volcanic glass) with Cristobalite inclusions
igneous
Unakite
Unakite (Epidote-Feldspar rock)
Metamorphic rock
Tumbled quartz pebble
Quartz (SiO₂), likely milky or fractured rock crystal
mineral
Porphyritic Basalt or Porphyry
Porphyritic Igneous Rock
igneous
Serpentinite
Serpentinite (composed largely of serpentine minerals like antigorite, lizardite, or chrysotile)
metamorphic
River Rocks (Polished River Pebbles)
Stream-rounded clastic sediments
Mixed (Sedimentary, Igneous, and Metamorphic)
Quartz Cobble (with Iron Oxide Staining)
Microcrystalline to Macro crystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2 permineralization)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary