Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Category
Organic (Non Rock)
Browse organic (non rock) specimens identified by the Rock Identifier community.
Green Quartzite
Quartzite (primarily SiO2 with chlorite inclusions)
metamorphic
Grey Agate (Tumbled)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Quartzite texture)
Arenite (SiO2 secondary)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone (Quartzite-rich River Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Greywacke)
Clastic Sedimentary Rock (SiO2 with lithic fragments)
sedimentary
Basalt (with possible mineral veining)
Basalt (Aphanitic Mafic Igneous Rock)
Igneous
Porphyritic Basalt with Quartz Inclusions
Aphanitic Porphyritic Basalt
Igneous
Vesicular Basalt
Basalt (with vesicular texture)
igneous
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Sandstone (likely Arkosic)
Clastic Sedimentary Rock
sedimentary
Pumice
Pumice (volcanic glass foam)
igneous
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide staining)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide matrix
sedimentary
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Red Jasper (Amygdaloidal Basalt with Agate)
Silicon dioxide (SiO2) in Basalt host
igneous
Chert / Flint
Cryptocrystalline quartz (SiO2)
Sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Fossilized Shark Tooth in Matrix
Otodus sp. (likely Otodus obliquus)
sedimentary
Sandstone (Quartzite Pebble)
Arenite (primarily SiO2)
sedimentary
Gold
Native Gold (Au)
mineral
Chalcedony (Tumbled)
Silicon Dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Flint / Chert
Silicon dioxide (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Rose Quartz
Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Banded Agate
Agate (Silicon Dioxide - SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Natural Gold Nugget
Native Gold (Au)
mineral
Unakite
Epidotized Granite
metamorphic
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary