Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Category
Industrial Byproduct (Anthropogenic Rock)
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Conglomerate
Conglomerate (Clastic sedimentary rock)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Basalt
Basalt (Volcanic Mafic Rock)
igneous
Limestone with Iron Oxide Staining
Sedimentary Rock (Calcite, CaCO3)
sedimentary
Garnetiferous Quartzite (Garnet Gneiss Pebble)
Garnet-bearing Quartzite or Quartz-Feldspar Gneiss
metamorphic
Basalt
Basalt (Mafic volcanic rock)
igneous
Quartzite
Metamorphic Quartz-rich Rock
metamorphic
Basalt
Basalt (Mafic volcanic rock)
igneous
Pink Granite
Granite (Felsic plutonic rock)
igneous
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Weathered, iron-stained rock fragment
Unidentified iron-oxide-stained silicate rock; precise identification is not possible from the image
sedimentary
Anthracite Coal
Anthracite (Carbon-rich metamorphic rock)
metamorphic
Rounded gray pebble, likely quartz-rich stone
Indeterminate; possibly quartzite or a weathered granitic pebble
rock
Pumice
Pumiceous volcanic glass
igneous
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Possible green tumbled stone
Unidentified green mineral or rock; the image is too blurred for reliable identification
mineral
Small rounded pebble, possibly quartz-rich stone
Indeterminate from image; likely quartz-bearing silicate rock
mineral
River Cobble (Weathered Granitoid)
Granodiorite / Quartz Diorite
igneous
Weathered dark mineral/rock fragment
Indeterminate; possibly iron-rich basalt, slag, or a sulfide-bearing mineral
mineral
Vesicular Basalt (Lava Rock)
Basalt (Vesicular Variety)
igneous
Muscovite Granite
Felsic intrusive igneous rock
igneous
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock - Arenite
sedimentary
Small pink mineral fragment
Indeterminate; possibly rose quartz or feldspar
mineral
Vesicular Basalt
Aphanitic Mafic Igneous Rock (with Vesicular Texture)
igneous
Yellow Sapphire
Corundum (Al2O3)
gemstone
Small rounded pebble (rock type indeterminate)
Unidentified fine-grained lithic pebble
sedimentary
Iron-rich meteorite candidate
Unclassified stony-iron or iron meteorite; possible weathered ordinary chondrite
meteorite
Black glassy volcanic rock, likely scoria or obsidian
Vesicular basaltic scoria (probable); possibly dark obsidian
igneous
Possible basaltic rock or meteorite candidate
Likely vesicular basalt; meteorite identification cannot be confirmed visually
igneous
Drill Core Samples (Varied Lithology)
Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)
igneous, sedimentary, and metamorphic
Paper (Cellulose)
Cellulose (C6H10O5)n
Organic (Anthropogenic)
Sandstone
Arenite (primarily SiO2)
sedimentary
Bauxite (Laterite)
Hydrated aluminum oxides (Al2O3·nH2O)
sedimentary
Small rounded pebble (rock type indeterminate)
Unidentified lithic pebble; specific composition cannot be determined from the image
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Quartz-veined Metamorphic Rock
Quartz Vein in Phyllite or Schist (SiO2 in Silicate Matrix)
metamorphic
Uncertain fine-grained rock or mineral-bearing specimen
Indeterminate; possible quartz- or feldspar-bearing matrix with reflective grains
mineral
Limonite Stained Basalt
Hydrated Iron Oxide on Mafic Volcanic Rock (FeO(OH)·nH2O)
igneous
Likely silicon carbide (carborundum)
Synthetic silicon carbide (SiC), likely blue-green crystalline grit
mineral
Weathered yellow-brown rock pebble
Undetermined; possibly iron-oxide-stained sandstone or mudstone
sedimentary
Rounded pebble, likely quartz-rich
Undetermined quartz-rich lithic pebble; exact rock type cannot be identified from the photograph
igneous