Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Category
Organic Material (Likely A Fruit Or Berry)
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Chert (Field Stone)
Microcrystalline / Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (likely Arkose or Quartz Sandstone)
Arenite (SiO2 principal component)
sedimentary
Chert Fossil (Pebble)
Microcrystalline Quartz (SiO2) with biogenic inclusions
sedimentary
Chert (Jasper-rich)
Microcrystalline/Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Jasper with Quartz Vein
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony/SiO2)
sedimentary
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (with Calcite Veining)
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) veins
sedimentary
Sandstone (likely Fossiliferous Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz / Chalcedony)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Honey calcite (orange calcite)
Calcite, calcium carbonate (CaCO₃)
mineral
Coquina (Fossiliferous Limestone)
Coquina (Organic Clastic Limestone)
sedimentary
Chert (Quartz Variety)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Likely petrified wood or silicified fossil fragment
Silicified wood; predominantly microcrystalline quartz (SiO₂)
fossil
Fossil bivalve shell
Likely an extinct or modern-like ribbed cockle/scallop; exact genus requires locality and diagnostic hinge features
fossil
N/A - Image does not contain a rock or mineral
Anthropogenic textile material
Non-geological
Granite or Pegmatite in host rock
Granitoid / Felsic Intrusive Rock
Igneous
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
mineral (silicate-replaced organic material)
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Amber
Succinite (fossilized resin, C10H16O)
mineral
Small seashell fossil or shell fragment
Likely calcium-carbonate shell material, chiefly aragonite or calcite; exact species indeterminate
fossil
Raw Amber / Resin Mineral
Succinite (Fossilized Tree Resin)
gemstone
Graphite-rich schist (likely graphite ore)
Graphite-bearing schist; predominantly graphitic carbon (C) with mica, quartz, and possible feldspar
metamorphic
Banded Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Brachiopod Fossil in Limestone
Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)
sedimentary
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Grey-Green Var.)
Silicon Dioxide (SiO2)
sedimentary
Green Jasper (with Quartz veining)
Jasper (Silica-rich microcrystalline variety of Quartz), formula: SiO2
sedimentary
Petrified Wood
Silicified Wood (primarily SiO₂ - Silicon Dioxide)
metamorphic
Coal (most likely Bituminous or Anthracite)
Coal (organic sedimentary rock)
Sedimentary
Chert (with Epidote/Quartz veining)
Cryptocrystalline silica (SiO2) with Epidote/Quartz inclusions
sedimentary
Banded Chert (likely Flint or Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Fossilized Shark Tooth
Carcharocles or Otodus sp. (Micro-fossilized)
sedimentary