Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Category
Synthetic Polymer (Synthetic Material)
Browse synthetic polymer (synthetic material) specimens identified by the Rock Identifier community.
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Limonite (Iron Ore)
Limonite (mixture of hydrated iron(III) oxide-hydroxides)
Mineral
Calligraphy Stone
Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)
sedimentary
Drupa Quartz (Sparkly Drusy Quartz on Matrix)
Crystalline Silicon Dioxide (SiO2) on host rock
mineral
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and Fossilized Brachiopod shell)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Limonite (Iron Ore)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral
Chert (Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Common Opal/Chalcedony mixture)
Silicon Dioxide (SiO2)
sedimentary
Dalmation Stone (Dalmation Jasper)
Peralkaline rock (primarily Feldspar and Quartz with Arfvedsonite spots)
igneous
Chert (Jasper)
Silicon dioxide (SiO2)
sedimentary
Chert (Jasper variation)
Chert (Cryptocrystalline microcrystalline Silicon Dioxide, SiO2)
sedimentary
Chert (Flint)
Chert (SiO2)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Milky quartz with dark host-rock inclusions
Quartz (SiO₂), likely in a granitic or metamorphic matrix
mineral
Likely quartz-rich mineral fragment
Quartz (SiO₂), possibly iron-stained or included quartz
mineral
Geode (Unopened)
Silica-rich Concretion (primarily SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
River Pebble
Lithified clastic sediment
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Fossil Coral
Rugosa or Tabulata coral fossil (Calcium Carbonate, CaCO3)
fossil
Jasper and Basalt Pebble
Polymineralic lithic pebble
igneous and sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Greenstone Pebble
Metabasalt / Greenschist
metamorphic
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Red Sandstone with Reduction Spot
Quartzose Sandstone with a Leach/Reduction Spot
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
River Pebble
Siliceous rock fragment
sedimentary
Banded Sedimentary Rock (Wishbone Stone / Banded Quartzite or Limestone)
Silicified limestone or banded sedimentary rock with mineral veins
sedimentary
Thunder Egg (Agate Core)
Cryptocrystalline Quartz (SiO2) in Rhyolite/Perlite Matrix
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Sedimentary Clastic Rock (Quartz arenite)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite or arkose)
sedimentary
Iron-Stained Quartz
Silicon Dioxide (SiO2) with Iron Oxide/Limonite coating
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Sandstone (Weathered Pebble)
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Sandstone (SiO2 dominant, with minor feldspar and clay minerals)
sedimentary
Quartz Pebble with Epidote / Chlorite Inclusions
Silicon Dioxide (SiO2) with Epidote/Chlorite inclusions
mineral