Green Slate or Metamorphic Rock with Moss/Lichen
Metamorphic rock / Phyllite or Slate variant
metamorphic
Category
Rock
Browse rock specimens identified by the Rock Identifier community.
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Red Granite Pebble
Intrusive Felsic Igneous Rock (Granite)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Fossiliferous Sandstone / Quartzite Pebble
Sedimentary rock with skeletal fragments (e.g., Paleozoic crinoid/brachiopod fossils)
fossil
River Rock
Siliciclastic rock (water-worn pebble)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sedimentary River Rock
Siliciclastic Sedimentary Rock (Quartzite or Sandstone pebble)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Red Sandstone Pebble
Sedimentary quartz sandstone
sedimentary
Basalt (River Pebble)
Mafic volcanic rock (rich in magnesium and iron)
igneous
Granite Pebble
Granite (composition of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Dark river-worn stone, likely basalt
Basalt; primarily plagioclase feldspar and pyroxene, with possible olivine and magnetite
igneous
Chert Geode or Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Quartz-veined Limestone
Sedimentary limestone with hydrothermal quartz/calcite veins (CaCO3 / SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Druzy Quartz Geode (Oco or Moroccan variety)
Silicon Dioxide (SiO2)
mineral
Red Siltstone (or Red Shale)
Clastic Sedimentary Rock (Composition: primarily Quartz, Clay minerals, and Hematite Fe2O3)
sedimentary
Basalt (Amygdaloidal)
Amygdaloidal Basalt
igneous
Possible basalt or iron-rich slag
Basalt (tentative; identification uncertain from image)
igneous
Leopard jasper (orbicular jasper)
Silicified volcanic rock, chiefly microcrystalline quartz/chalcedony (SiO₂) with feldspar and iron-oxide inclusions
metamorphic
Quartzite (Iron-stained)
Quartzite (SiO2 with Fe2O3 staining)
metamorphic
Chert (Nodule)
Microcrystalline or Cryptocrystalline Silica (SiO2)
sedimentary
Chert Breccia (Yellow Jasper)
Silicon Dioxide (SiO2) - Brecciated Chert
sedimentary
Bauxite / Iron-rich Laterite
Laterite (principally Al(OH)3, Fe2O3, and SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Gneiss with Quartz Vein
Gneiss (containing SiO2 vein)
metamorphic
Fluorite on Matrix
Calcium Fluoride (CaF2)
mineral
Granite Cobble
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Basalt with Plagioclase Feldspar
Basalt (mafic extrusive igneous rock) with plagioclase feldspar phenocrysts
Igneous
Pumice
Pumice
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Basalt
Basalt
igneous
Basalt
Extrusive Igneous Rock
igneous
Kimberlite
Ultramafic igneous rock
igneous
Basalt Pebble
Extrusive Igneous Rock
igneous
Shatter Cone (Impactite)
Shock-metamorphosed rock
metamorphic
Basalt (with Iron Staining)
Mafic Igneous Rock
igneous
Pumice
Pumice (Volcanic glass / Felsic igneous rock)
igneous
Vesicular Basalt
Extrusive mafic igneous rock (Basalt with vesicular texture)
igneous