Black Onyx
Onyx (Silicon Dioxide, SiO2)
mineral
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
Black Sapphire
Corundum (Al2O3 with iron and titanium impurities)
mineral
Limonite-stained Chert/Jasper
Microcrystalline Quartz (SiO2) with Iron Oxides (FeO(OH)·nH2O)
sedimentary
Black Onyx
Chalcedony (Silicon Dioxide, SiO2)
mineral
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Quartzite
Quartzite (SiO2 silicon dioxide)
metamorphic
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Leopard Skin Jasper
Orbicular Rhyolite (Silicon Dioxide with various impurities)
sedimentary
Red Jasper
Silicon dioxide (SiO2) with iron inclusions
sedimentary
Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Quartzite (with Metamorphic Foliation)
Quartzite (Recrystallized SiO2)
metamorphic
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2)
sedimentary
Terrazzo (Synthetic Composite Rock)
Cementitious or Epoxy Resin-bound Aggregates
Man-made metamorphic-style composite
Scoria (Vesicular Basalt)
Scoria (Vesicular Igneous Rock)
igneous
Scoria (Lava Rock)
Scoria (Mafic Volcanic Rock)
igneous
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in a Geodic structure
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Green Chalcedony (likely Chrysoprase or Green Onyx)
Silicon Dioxide (SiO2) with trace nickel or chromium inclusions
mineral
Yellow Quartzite (Iron-Stained Quartz)
Quartzite (SiO2 with Fe-oxide impurities)
metamorphic
Quartzite Pebbles
Quartzite (SiO2 silicon dioxide dominant)
metamorphic
Jasper (Milky/Cream Variety)
Silicon Dioxide (SiO2) - variety of Chalcedony
sedimentary (chemical/biological)
Black Onyx
Onyx (Silicon Dioxide, SiO2)
mineral
Chert with Asphaltum (or Tar)
Silica (SiO2) with natural Bitumen/Asphaltum
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Geode (unopened)
Chert / Chalcedony Geode (SiO2)
sedimentary
Scoria (Lava Rock)
Mafic Volcanic Scoria
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic silicate with secondary mineral inclusions)
Igneous
Basalt (Weathered/Tumbled)
Extrusive Mafic Igneous Rock
igneous
Black Onyx
Black Chalcedony (SiO2)
mineral
Agatized Petrified Wood
Silicon Dioxide (SiO2) - Chalcedony pseudomorph after Wood
metamorphic
Ocean Jasper (Orbicular Jasper)
Spherulitic Chalcedony/Rhyolite (SiO2)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock type)
sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2 with iron oxide impurities)
sedimentary
Quartz Geode with Goethite/Hematite
Silicon Dioxide (SiO2) with Iron Oxides
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2) in a Sedimentary Host
mineral
Conglomerate
Conglomerate rock
sedimentary
Iron-stained Quartzite
Quartzite with Limonite/Hematite staining (SiO2 with FeO(OH)·nH2O)
metamorphic
Vesicular Basalt (Amygdaloidal)
Vesicular Basalt (Fe-Mg rich extrusive volcanic rock)
igneous
Red Quartz (Hematoid Quartz)
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
mineral
Quartz Geode (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral