Basalt (River Cobble)
Mafic Igneous Basalt (composed primarily of Plagioclase feldspar, Pyroxene, and Olivine)
Igneous
Category
Mineral, Possibly Rock Fragment Containing A Mineral
Browse mineral, possibly rock fragment containing a mineral specimens identified by the Rock Identifier community.
Prase quartz with actinolite inclusions
Silicon dioxide (SiO2) with Calcium Magnesium Iron Silicate Hydroxide inclusions
mineral
Moss Agate / Chalcedony
Silicon Dioxide (SiO2)
mineral
Dalmatian Jasper
Peralkaline rhyolite
igneous
Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
mineral
Serpentine
Serpentinite (rock) containing serpentine minerals (e.g., Antigorite, Lizardite, Chrysotile)
Metamorphic rock
Granitic Pegmatite
Granite Pegmatite (typically containing Quartz SiO2, Feldspar KAlSi3O8, and Muscovite)
Igneous
Diorite (Salt and Pepper Rock)
Diorite
igneous
Petrified Wood
Silicified Wood (primarily SiO₂ - Silicon Dioxide)
metamorphic
Chert (Brecciated Chert)
Silicon Dioxide (SiO2)
sedimentary
Vuggy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Fossiliferous Limestone
Bioclastic Limestone (composition: CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Rose Quartz
Silicon dioxide with traces of titanium, iron, or manganese (SiO2)
mineral
Gneiss
Gneissic Metamorphic Rock
metamorphic
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Basalt Scoria
Vesicular Basalt
igneous
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains, primarily SiO2)
sedimentary
Basalt with Epidote (Greenstone)
Amygdaloidal Basalt (Ca2(Al, Fe)3(SiO4)3(OH) inclusions)
igneous
Garden Quartz (Lodalite)
Silicon Dioxide (SiO2) with various inclusions
mineral
Sandstone with trace fossil
Sandstone, possibly with Skolithos or similar trace fossil
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Amethyst (Geode Fragment)
Silicon Dioxide (SiO2 with iron impurities)
mineral
Granite
Phaneritic Igneous Rock (Granite)
igneous
Ferruginous Breccia
Breccia with Iron-rich (Hematite/Goethite) Matrix
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with Fuscite inclusions
mineral
Amber
Succinite (fossilized tree resin), C10H16O
Organic Gemstone
Cinnabar in Quartz
Silicon Dioxide (Quartz, SiO2) with Mercury Sulfide inclusions (Cinnabar, HgS)
mineral
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Serpentine (Serpentinite)
Antigorite, Lizardite, and Chrysotile: (Mg,Fe)3Si2O5(OH)4
metamorphic
Geode with Quartz Crystal Cavity
Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix
sedimentary
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Geode (Unopened)
Siliceous Concretion / Geode
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Red Sandstone (Old Red Sandstone Pebble)
Arenite with iron oxide (Fe2O3) cement
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Micaceous/Feldspathic variant)
Arenite (specifically subarkose or lithic arenite)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Shungite
Shungite (carbon-rich Precambrian mineraloid)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Red Shale
Lutite (primarily composed of Hydrous Aluminum Silicates with Hematite staining)
sedimentary