Serpentine, likely a variety of Chrysoprase (green chalcedony) or a similar translucent green mineral.
Serpentine Group Minerals (e.g., Antigorite, Lizardite) or Chalcedony (SiO2) with nickel impurities for Chrysoprase green.
mineral
Category
Anthropogenic (Man Made Material Processed By Nature)
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Brown Jasper / River Siltstone
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement)
fossil
Ferruginous Sandstone
Ferruginous Clastic Sedimentary Rock
sedimentary
Chert / Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Seraphinite
Clinochlore (Mg,Fe)5Al(AlSi3O10)(OH)8 - specific variety for Seraphinite due to its fibrous inclusions and chatoyancy.
Mineral
Moss Agate
SiO2 (Silicon Dioxide) with dendritic inclusions
Mineral
Textile (Upholstery Fabric)
Woven Polyethylene/Polyester or Cotton Blend
Synthetic or Natural Fiber
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood / Chalcedony (SiO2)
mineral
Quartz (River Pebble)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartz Boulder
Silicon Dioxide (SiO2)
mineral
Seashell fragment
Calcium carbonate (CaCO3)
Biogenic material
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)
sedimentary
Garden Pebble (Quartzite or Limestone fragment)
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) fragment
sedimentary
Petrified Wood
Silicified wood (SiO2)
fossil
Petrified Wood
Silicified wood (SiO2)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Jasper (likely a variety of Brecciated Jasper or a patterned variety)
Silicon dioxide (SiO2)
Mineral
Fossilized Shark Tooth
Chondrichthyes tooth
fossil
Shark Tooth Fossil
Chondrichthyes (class) fossilized tooth
fossil
Fossilized Bone
Petrified Bone / Biogenic Sedimentary
fossil
Chert (and Jasper) Nodules in Limestone
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)
fossil
Tiffany Stone
Bertrandite Fluorite (CaF2 + Be4Si2O7(OH)2)
metamorphic
Chert (Agate/Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
River Pebble (Quartzite / Chert)
Silicon Dioxide (SiO2)
sedimentary
Pebble (likely Quartz or Chert)
SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.
Sedimentary Rock
Basalt Breccia
Volcanic Breccia (composed of basaltic clasts in a fine-grained matrix)
igneous
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Sandstone Chert/Quartzite
Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite
sedimentary
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Pearl-embellished decorative cross
Pearl (biogenic calcium carbonate, predominantly aragonite) with rhinestone-mounted glass or synthetic gemstones
gemstone
Riverstone Quartzite
Quartzite (primarily SiO2)
metamorphic
Fossilized Bone / Dinosaur Fossil
Fossilized vertebrate bone (permineralized)
fossil
Jasper (Petrified Wood Variety)
Silicon Dioxide (SiO2)
sedimentary
Granite River Cobble
Phaneritic Felsic Igneous Rock (Granite)
igneous
Shark Tooth Fossil
Carcharhiniformes or Lamniformes (order level fossil)
fossil
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Fossilized Bivalve Shell
Bivalvia (Phylum Mollusca)
fossil
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary