Aventurine Quartz
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
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Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Snowflake Obsidian
Vitreous volcanic rock with Cristobalite inclusions (mostly SiO2)
igneous
Golden Healer Quartz
Ferruginous Quartz (SiO2 with Fe2O3 inclusions)
mineral
Bauxite
Aluminum ore / Hydrated aluminum oxides
sedimentary
Fossilized bivalve shell
Bivalvia indeterminate; likely a preserved clam or cockle shell, composed mainly of calcium carbonate (CaCO₃)
fossil
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
sedimentary
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Amethyst
Silicon dioxide (SiO2) with iron impurities
mineral
Carnelian Agate
Chalcedony (SiO2) with iron oxide inclusions
mineral
Raw Garnet Fragment
Nesosilicate Group (e.g., Almandine, Fe3Al2(SiO4)3)
mineral
Tumbled kambaba jasper (likely)
Kambaba jasper, a silica-rich microcrystalline quartz aggregate, commonly containing fossilized cyanobacterial structures and dark green amphibole/pyroxene minerals
sedimentary
Red Jasper
Jasper (SiO2, Silicon Dioxide with Iron inclusions)
sedimentary
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2 with chlorite inclusions)
mineral
Jasper (specifically Yellow/Red Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Black Tourmaline
Schorl (complex sodium iron aluminum borosilicate)
mineral
Fire Agate
Silicon Dioxide (SiO2) with layers of Limonite/Goethite
mineral
Carnelian
Carnelian (Silica/Chalcedony, SiO2)
mineral
Red Jasper (specifically Brecciated Jasper)
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Blue Dyed Agate Slice
Silicon Dioxide (SiO2) with artificial pigment
mineral
Orbicular Jasper (Ocean Jasper)
Silica-rich Microcrystalline Quartz (SiO2) with various inclusions
sedimentary
Obsidian with Slate/Tuff
Volcanic glass (SiO2) with associated pyroclastic rock
igneous
Amazonite
Potassium Feldspar (KAlSi3O8)
mineral
Indigo Gabbro
Gabbro (Alkali Gabbro)
igneous
Amethyst
Silicon Dioxide (SiO2) with trivalent iron (Fe3+) impurities
mineral
Breciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Moonstone
Orthoclase (Potassium aluminum silicate - KAlSi3O8)
mineral
Tumbled serpentinite (likely antigorite-rich serpentine)
Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, chromite, or brucite
metamorphic
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Aventurine Quartz
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Carnelian Agate
Red Chalcedony (SiO2 with Iron Oxide impurities)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Obsidian (Black)
Obsidian (approx. 70–75% SiO2)
igneous
Carnelian Agate
Carnelian (Silicon Dioxide - SiO2)
mineral
Dyed Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Amethyst
Silicon dioxide (SiO2) with iron impurities
mineral
Limonite/Goethite on Shale
Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock
sedimentary
Banded Calcite (Green Onyx)
Calcium Carbonate (CaCO3)
sedimentary
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary