Chert (Jasper/Agate variety)
Microcrystalline quartz (SiO2)
sedimentary
Category
Glass
Browse glass specimens identified by the Rock Identifier community.
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Quartzite Pebble
Quartzite (SiO2)
metamorphic
Green Aventurine Quartz
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Mica-rich Schist fragment
Mica Schist
metamorphic
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Snowflake Obsidian
Volcanic glass containing Spherulitic inclusions (SiO2 + impurities)
igneous
Snowflake Obsidian
Volcanic glass containing Cristobalite (SiO2)
igneous
Opalite
Opalescent Glass (SiO2 + coloring agents)
Mineral (Synthetic/Man-made)
Quartz Nut
SiO2 (Silicon Dioxide)
mineral health
Snowflake Obsidian
Volcanic Glass with Cristobalite inclusions (70–75% SiO2)
Igneous
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Green Glass Slag
Amorphous Silicon Dioxide (SiO2) with metal oxide impurities
mineraloid (man-made)
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 composition dominant)
sedimentary
Sand and Gravel (Quartz-rich)
Unconsolidated fluvial/beach sediment (primarily Silica/SiO2)
sedimentary
Sandstone
Arenite (mainly SiO2 with varying cements)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (with Chert/Quartzite)
Arenite (SiO2 primarily)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz (Iron-Stained)
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzite-rich)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartzite Pebble
Metamorphic Quartzite (primarily SiO2)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Yellow/Citrine variety)
Crystalline Silicon Dioxide (SiO2)
mineral
Sandstone (likely Quartz Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Quartz Pebble (Citrine or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (likely Fossiliferous)
Arenite / Fossiliferous Sandstone (SiO2 composition)
sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Sand Grain (Silica/Quartz Grain)
Silicon Dioxide (SiO2)
sedimentary