Quartzite Pebble
Quartzite (SiO2)
metamorphic
Category
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Obsidian
Volcanic Glass (70-75% SiO2)
igneous
Quartzite with Quartz Veining
Meta-quartzite (composed primarily of SiO2)
metamorphic
Glass / Silicon Dioxide (Man-made)
SiO2 (Amorphous Silicon Dioxide)
Amorphous Solid
Amber
Succinates (C10H16O)
mineraloid
Quartzite
Quartzite (primarily SiO2)
metamorphic
Snowflake Obsidian
Volcanic Glass (spherulitic obsidian)
igneous
Amber
Succinates
mineraloid
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone with Liesegang Rings
Liesegang-banded Sandstone
sedimentary
Blue Dyed Agate Slice
Silicon Dioxide (SiO2) with artificial pigment
mineral
Agate
SiO2
mineral
Chert
Silicon dioxide (SiO2)
Sedimentary
Dyed Agate
SiO2
mineral
Quartz pebble
SiO2 (Silicon dioxide)
mineral
Dyed Quartz Crystals
Silicon Dioxide (SiO2) with artificial pigment
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Flint Nodules)
Silicon Dioxide (SiO2)
sedimentary
Banded Agate (Onyx type)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Banded)
Arenite with Iron Oxide Banding
sedimentary
Amethyst Crystal Point
SiO2 (Silicon Dioxide with iron impurities)
mineral
Amethyst Elestial Quartz
Silicon Dioxide with inclusions (SiO2)
mineral
Amethyst (Rough Crystal)
Silicon Dioxide (SiO2) with iron impurities
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
gemstone
Chert / Flint Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Sandstone (with Rock Art)
Sandstone (Clastic Sedimentary Rock)
sedimentary
Tumbled Amethyst and Smoky Quartz
Silicon Dioxide (SiO2) with impurities
mineral
Chert (Arrowhead Point)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
fossil
Geode (Chert/Quartz)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Ferruginous)
Clastic sedimentary rock (SiO2 with Fe2O3)
sedimentary
Black Onyx
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Chert (River Pebble)
Microcrystalline silica (SiO2)
sedimentary
Chert
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Ferruginous Sandstone
Clastic Sedimentary Rock (Sandstone with Iron Oxide cement)
sedimentary
Blue Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
gemstone
Amethyst
Silicon Dioxide with iron impurities (SiO2)
gemstone
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Carnelian Agate Beads
Silicon Dioxide (SiO2)
gemstone