Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Category
Anthropogenic (Man Made Artifact)
Browse anthropogenic (man made artifact) specimens identified by the Rock Identifier community.
Silver (Sterling Silver Jewelry)
Argentum (Ag) mixed with Copper (Cu)
mineral
Jasper or Chert
Silicon Dioxide (SiO2)
sedimentary
Greywacke
Greywacke (Lithofeldspathic Sandstone)
sedimentary
Scoria (Lava Rock)
Scoria
igneous
Milky Quartz (with trace inclusions)
Silicon Dioxide (SiO2)
mineral
Quartz (likely a form of massive or vein quartz)
Quartz (SiO₂)
Mineral
Chert (Yellow Jasper variant)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Pebble (likely a type of sandstone or quartzite pebble)
Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.
Sedimentary rock
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Sandstone (with minor quartz and possible clay components)
Clastic Sedimentary Rock (SiO2 dominated)
sedimentary
Jadeite Jade
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Petrified Wood
Silicified wood (Quartz variant, SiO2)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Fossilized Coral (Petoskey Stone or Rugose Coral)
Antophyllum (Hexagonaria) or Scleractinia (CaCO3)
sedimentary
Citrine
Citrine (Silicon Dioxide, SiO2)
mineral
Citrine Quartz Sphere
Silicon Dioxide (SiO2)
mineral
Scoria (Red Lava Rock)
Scoria
igneous
Yellow Citrine Quartz
Silicon Dioxide (SiO₂)
mineral
Brown Jasper
Jasper (a cryptocrystalline variety of Quartz, SiO2)
Mineral, specifically a variety of Quartz
River Quartz / Quartzite Pebbles
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Agate (Nodule/Chert)
Silicon Dioxide (SiO2)
sedimentary
Amber (Cherry or Red variety)
Succinite (with various trace amounts of organic compounds)
Organic Gemstone (not a rock)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone (Quartzite-rich)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartz
Quartz (SiO2, Silicon Dioxide)
Mineral
Imperial Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz with Mineral Inclusions
Sedimentary
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2), a variety of Actinolite-Tremolite
metamorphic
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Basaltic Scoria
Scoria (Vesicular Basalt/Andesite)
igneous
Amber
Succinite (with a generalized formula of C10H16O)
mineral
Marble
Metamorphosed Limestone (principally CaCO3)
metamorphic
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Agate (Dyed High-Grade Polished Slice)
Silicon dioxide (SiO2), Chalcedony crystal variety
mineral
Greenstone / Greenstone Pebble
Greenschist (metamorphosed basalt or gabbro)
metamorphic
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
Mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite)
sedimentary
Basalt (River Rock pebble)
Basalt (a mafic extrusive igneous rock)
igneous
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Peacock Ore
Bornite (Cu5FeS4)
mineral
Basalt
Basalt (Aphanitic Mafic Volcanic Rock)
Igneous