Dalmatian Jasper / Dalmatian Stone
Peralkaline Rock (Silicon Dioxide with Amphibole inclusions)
igneous
Category
Rock
Browse rock specimens identified by the Rock Identifier community.
Shale
Fissile mudstone (Shale)
sedimentary
Quartz Geode
Silicon dioxide (SiO2)
sedimentary
Basalt
Extrusive Igneous Rock
igneous
Ulexite
NaCaB5O6(OH)6·5H2O
mineral
Basalt
Aphanitic Mafic Igneous Rock
igneous
Vesicular Basalt (Lava Rock)
Basalt (Vesicular Variety)
igneous
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone (Ferruginous)
Arenite with Iron Oxide (Limonite/Hematite) coating
sedimentary
Quartz with Host Rock
Silicon Dioxide (SiO2)
mineral
Serpentine-rich metamorphic rock
Serpentinite, likely antigorite/lizardite with accessory magnetite or chromite
metamorphic
Druzy Quartz on Matrix (likely Limestone or Sandstone)
Silicon Dioxide (SiO2) with various trace impurities
Mineral on Sedimentary Rock
Likely weathered granite or granitic gneiss
Granite: quartz + feldspar + mica; possibly gneiss if the faint texture reflects foliation
igneous
Granite with a polished dark-red granite cobble
Granite; predominantly quartz, feldspar, and mica
igneous
Weathered garnet-bearing gneiss
Quartz–feldspar–mica gneiss with almandine garnet, chiefly Fe₃Al₂(SiO₄)₃
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Quartz Druzy (on Matrix)
Silicon Dioxide (SiO2)
mineral
Schist
Metamorphic Rock
metamorphic
Conglomerate
Conglomerate rock
sedimentary
Conglomerate
Conglomerate rock
sedimentary
Conglomerate
Conglomerate rock
sedimentary
Sandstone or Limestone
Sedimentary Rock
Sedimentary
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Mixed Rock and Mineral Collection
Various geological specimens
igneous, sedimentary, and metamorphic
Coquina / Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
Sedimentary
Sandstone Concretion
Moqui Marble / Ironstone Concretion (Iron oxide-cemented sandstone)
sedimentary
Conglomerate (Quartz Pebble Conglomerate)
Quartz Pebble Conglomerate
sedimentary
Sandstone
Sandstone (composed predominantly of Quartz, SiO2)
sedimentary
Red Scoria
Scoria (Vesicular Basalt/Andesite)
igneous
Sedimentary Rock with Crafts (Pet Rock)
Sedimentary rock decorated with synthetic materials
sedimentary
Weathered mafic rock, likely basalt
Basalt; primarily plagioclase feldspar, pyroxene, and minor olivine or iron oxides
igneous
Vesicular Basalt with Epidote
Vesicular Basalt (Mg, Fe)2SiO4 with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
igneous
Tumbled amber-colored agate or chalcedony
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/agate
mineral
Rounded quartz-rich river pebble
Lithic clast, likely quartzite or fine-grained sandstone
sedimentary
Rounded quartz-rich pebble
Chert or quartzite pebble (tentative; mostly microcrystalline quartz, SiO₂)
sedimentary
Quartz Crystal Cluster on Matrix
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Agate (specifically a Yellow/Honey Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Quartz Crystal on Matrix
Silicon Dioxide (SiO2)
mineral
Blue-gray quartz-rich rock, possibly blue aventurine or sodalite-bearing stone
Probable quartz–feldspar aggregate; exact identification requires testing
mineral
Dark gray fine-grained rock fragment
Likely basalt (possibly andesite); exact identification is limited by the photograph
igneous