Weathered greenish rock fragment
Indeterminate; possibly epidote- or chlorite-bearing altered silicate rock
mineral
Category
Industrial Byproduct (Anthropogenic Rock)
Browse industrial byproduct (anthropogenic rock) specimens identified by the Rock Identifier community.
Learn about Industrial Byproduct (Anthropogenic Rock) in the encyclopedia
View all →
Quartzite (Engineered Stone)
Silicon Dioxide (SiO2) based synthetic composite
metamorphic
Black Diamond (Carbonado)
Carbonado (Polycrystalline Diamond)
gemstone
Quartz (Iron-stained or Rose variant)
Silicon Dioxide (SiO2)
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Coal
Anthracite or Bituminous Coal (Carbon)
sedimentary
Schist
Mica Schist
metamorphic
Agate (specifically a Yellow/Honey Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Gold-bearing Quartz Ore
Auriferous Quartz (SiO2 with Au)
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Serpentinite
Serpentinite (composed primarily of serpentine group minerals like lizardite, antigorite, and chrysotile)
metamorphic
Quartz (Water-worn Pebble)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone
Sandstone (clastic sedimentary rock), primarily SiO2
sedimentary
Opalite
Man-made Glass (SiO2 + additives)
mineraloid (synthetic)
Weathered gray-green pebble
Indeterminate; possibly altered basalt, serpentinite, or a greenish metamorphic rock
mineral
Small rounded pebble
Unidentified lithic clast; likely fine-grained sandstone, mudstone, or basalt
sedimentary
Quartzite (River Pebble)
Recrystallized Quartz (SiO2)
metamorphic
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 predominantly)
sedimentary
Quartz-bearing iron-stained breccia
Brecciated quartz/quartzite with iron oxides, chiefly SiO₂ with hematite/goethite and possible feldspar or host-rock fragments
mineral
Basalt
Basalt
igneous
Fossil coral fragment
Likely calcitic colonial coral, possibly fossilized scleractinian coral
fossil
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Cullet Glass (Industrial Slag Glass)
Amorphous Silica (SiO2) with metallic oxide impurities
Man-made byproduct (often mistaken for Obsidian or Emerald)
Bituminous Coal
Organic Sedimentary Rock (Carbon-based)
sedimentary
Basalt (tumbled/river-worn)
Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt
Basalt (predominantly Plagioclase Feldspar and Pyroxene)
igneous
Brown Pebble (River Rock)
Indeterminate (Likely Silicon Dioxide / Quartz-rich)
sedimentary
Pegmatite
Coarse-grained Igneous Rock (Granitic Pegmatite)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Basalt
Basalt (composition predominately plagioclase feldspar and pyroxene)
igneous
Serpentine
Hydrous magnesium iron silicate, (Mg,Fe)3Si2O5(OH)4
metamorphic
Peacock Ore
Bornite (Cu5FeS4) or Chalcopyrite treated with acid
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral