Basalt with Plagioclase Phenocrysts
Porphyritic Basalt
igneous
Category
Not A Rock (Synthetic Material)
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Sandstone (with biological crust)
Arenite (SiO2 based)
sedimentary
Fordite
Anthropogenic paint-rock
mineraloid (human-made geological specimen)
Likely dark green-gray metamorphic pebble
Indeterminate; possibly chlorite schist, serpentinite, or amphibolite
metamorphic
Basalt (Weathered)
Extrusive Igneous Rock (Mafic composition)
igneous
Cullet Glass (Strawberry Glass)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Mineraloid (Synthetic/Man-made)
Concrete Fragment
Hardened Portland Cement Composite
Anthropogenic (Man-made material mimicking sedimentary rock)
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Laterite (Red Clay)
Laterite (Fe2O3 · nH2O and Al2O3 · nH2O)
sedimentary
Fossilized Bone
Petrified Bone (Fluorapatite / Calcium Phosphate replacement)
fossil
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Puddingstone
Conglomerate
Sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Bituminous Coal (with Anthracite or Vitrinite inclusion)
Organic-rich Sedimentary Rock (Carboniferous classification)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Andesite
Andesite (Intermediate Extrusive Volcanic Rock)
igneous
Chert Nodules
Chert (SiO2)
sedimentary
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Basalt (Glassy)
Basalt (Aphanitic-Glassy texture)
igneous
Serpentine / Serpentinite (with Weathering Crust)
Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Diorite (Salt and Pepper Rock)
Diorite
igneous
Khondalite
Garnet-Sillimanite-Graphite Gneiss
metamorphic
Granite Water-Worn Pebble
Intermediate to Felsic Phaneritic Igneous Rock
igneous
Sandstone
Sedimentary Rock (Quartz arenite/Arkose)
sedimentary
Sandstone (Weathered)
Arenite (typically SiO2 as quartz grains)
sedimentary
Sandstone (Weathered Pebble)
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite
sedimentary
Glacial Quartzite Cobble
Meta-orthoquartzite (SiO2)
metamorphic
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Basalt Pebble
Mafic Igneous Rock (Basalt)
igneous
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Fossil Shell
Invertebrate fossil (Mollusca)
fossil
Dalmation Stone (Dalmation Jasper)
Peralkaline rock (primarily Feldspar and Quartz with Arfvedsonite spots)
igneous
Likely petrified wood
Silicified wood, chiefly microcrystalline quartz (SiO₂)
fossil
Tumbled brecciated jasper
Silica-rich microcrystalline quartz/chalcedony (SiO₂), with iron-oxide and other mineral inclusions
mineral
Unakite
Unakite (Epidotized Granite)
metamorphic
Diorite
Phaneritic Intermediate Plutonic Rock
igneous
Sandstone
Arenite (primarily composed of SiO2)
sedimentary
Weathered, quartz-rich metamorphic rock (likely schist or gneiss)
Quartz–feldspar–mica schist/gneiss, with surface lichens and iron-oxide staining
metamorphic