Basalt
Basalt (SiO2 percentage between 45% and 52%)
igneous
Category
Organic (Non Rock)
Browse organic (non rock) specimens identified by the Rock Identifier community.
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Sandstone (Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Plume Agate
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzose)
Sandstone (clastic sedimentary rock, primarily SiO2)
sedimentary
River Pebble Gravel
Hydrothermally modified Clastic Sediment (mainly Quartzite and Chert)
sedimentary
Agate
Silicon dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Aventurine
Silicon Dioxide (SiO2) with inclusions
mineral
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2) and Slate/Shale
mineral
Amethyst Quartz
Silicon Dioxide (SiO2)
mineral
Botryoidal Chalcedony
Silicon Dioxide (SiO2)
mineral
Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Weathered Sandstone with Algae Growth
Arenite
sedimentary
Fulgurite
Lechatelierite (Silica glass), typically SiO2
mineraloid
Iron Slag
Anthropogenic Vitreous Silicate (Byproduct of Smelting)
Mineral-like byproduct
Gold
Native Gold (Au)
mineral
Gold
Native Gold (Au)
mineral
Basalt (River Stone)
Aphanitic Mafic Igneous Rock
igneous
Sandstone (Quartz-rich)
Arenite (SiO2 based clastic rock)
sedimentary
Unakite
Epidotized Granite (SiO2 with Ca2(Al, Fe)3(SiO4)3(OH))
metamorphic
Basalt
Basalt (Mafic Extrusive)
igneous
Unakite (Tumbled)
Unakite (altered granite)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Dyed Agate Geode (Pink/Magenta)
Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Carnelian Agate (with Quartz/Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Bloodstone
Heliotrope (a variety of Cryptocrystalline Quartz / Jasper, SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Carnelian Agate
Silicon Dioxide (SiO2) with high Iron Oxide impurities
mineral
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Milky Quartz Pebble with Chert
Silicon Dioxide (SiO2)
mineral
Carnelian (Red Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral