Fossiliferous Limestone (with Crinoids/Coral)
Fossiliferous Limestone (CaCO3)
sedimentary
Category
Man Made Object (Ring)
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Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Jadeite
Jadeite (NaAlSi2O6)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony/SiO2)
sedimentary
Petrified Wood
Silicon Dioxide (SiO2) - Calcified / Silicified Wood
sedimentary
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
metamorphic
Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Stromatolite
Laminated biogenic sedimentary structure (formed by Cyanobacteria)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Diamond (Pear Cut)
Carbon (C)
gemstone
Fossilized tooth, likely mammalian molar
Indeterminate Mammalia; mineralized dentine and enamel
fossil
Fossilized Ray Barb (Stinger) Fragment
Myliobatiformes indet. (Fossil stingray spine)
fossil
Chert (Jasper variation)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Tektite
Natural impact glass
meteorite
Obsidian
Obsidian (Volcanic Glass)
igneous
Banded Calcite (often marketed as 'Mexican Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Green Onyx (Banded Calcite)
Calcite (Calcium Carbonate, CaCO3)
mineral
Carnelian
Carnelian (Silica/Chalcedony, SiO2)
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Likely slate fragment
Slate; fine-grained foliated metamorphic rock, commonly quartz–mica–chlorite rich
metamorphic
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Raw Carnelian
Quartz (Chalcedony) - SiO2 with Fe2O3 inclusions
mineral
Jasper with Quartz Vein
Microcrystalline quartz (SiO2) with quartz infill
sedimentary
Agate
SiO2 (Chalcedony / Quartz)
sedimentary
Carnelian and Strawberry Quartz
Silicon Dioxide (SiO2) with Hematite and Limonite inclusions
mineral
Fossilized Wood (Petrified Wood)
Agatized wood (primarily SiO2)
fossil
Carnelian
Carnelian (microcrystalline quartz, SiO2)
gemstone
Carnelian Agate
Silicon Dioxide (SiO2) with Hematite impurities
mineral
Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Banded Agate
Cryptocrystalline Quartz (SiO2)
mineral
Petrified Wood (Agatized/Silicified Wood)
Silicified Wood (SiO2)
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) with Iron Oxide impurities
mineral
Carnelian (Carnelian Agate)
Carnelian (Silicon Dioxide - SiO2)
mineral
Carnelian
Carnelian (Silicon Dioxide, SiO2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
mineral
Sodalite beads
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, likely with minor lazurite/pyrite or calcite inclusions
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized wood fragment
Petrified wood; commonly silicified fossil wood (SiO₂ replacing organic tissue)
fossil