Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Category
Not A Rock
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Chert (Iron-stained)
Chert (SiO2)
sedimentary
Fossiliferous Limestone
Limestone with fossil bioclasts (Calcium Carbonate, CaCO3)
sedimentary
Sandstone (Greywacke)
Sandstone (SiO2 enriched with lithic fragments)
sedimentary
Basalt Pebble
Basalt
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral with metamorphic or sedimentary host
Feldspar-Quartz Rock (likely Pegmatite or Granite)
Feldspar-Quartz composite rock (KAlSi3O8 - SiO2)
igneous
Faceted Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
gemstone
Quartz Druse (on Chalcedony/Agate base)
Silicon Dioxide (SiO2)
mineral
River Pebble (Basalt or Gabbro)
Mafic Igneous Rock
igneous
Granodiorite
Granodiorite (containing Quartz, Plagioclase Feldspar, Biotite, and Hornblende)
igneous
Basalt (Purple-tinted scoria/vesicular variety)
Extrusive mafic igneous rock (SiO2 range 45–52%)
igneous
Vesicular Basalt (Scoria)
Basalt (Vesicular)
igneous
Foliated Gneiss
Gneiss (Metamorphic Rock)
metamorphic
River Stone (Sandstone or Siltstone)
Sedimentary Rock (Clastic)
sedimentary
Basalt
Mafic Igneous Rock
igneous
Porphyry
Porphyritic Igneous Rock
igneous
Basalt
Mafic volcanic rock
igneous
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Shale
Argillaceous Sedimentary Rock
sedimentary
Porphyry (likely Porphyritic Andesite or Basalt)
Porphyritic Igneous Rock
igneous
Hag Stone
Perforated Sedimentary Rock
sedimentary
Porphyry
Porphyritic Igneous Rock
igneous
Greenstone
Protolith: Basaltic rock
metamorphic
Slate
Foliated Metamorphic Rock
metamorphic
Granitic Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Foliated Metamorphic Rock
metamorphic
Granite (Weathered)
Granitic intrusive rock
igneous
Conglomerate
Conglomerate Rock (Paraconglomerate)
sedimentary
Fordite
Anthropogenic paint-rock
mineraloid (human-made geological specimen)
Slate
Slate (Metamorphic Rock)
metamorphic
Basalt
Mafic Igneous Rock
igneous
Basalt
Mafic Igneous Rock
igneous
Basalt
Mafic Igneous Rock
igneous
Gneiss
Foliated Metamorphic Rock
metamorphic
Peridotite
Peridotite (Ultramafic Rock)
igneous
Granite Pebble
Felsic Plutonic Rock
igneous
Sandstone (likely Siltstone or fine-grained Sandstone)
Sedimentary Rock (Clastic)
sedimentary
Gabbro
Plutonic mafic rock
igneous
Greenschist
Greenschist facies rock
Metamorphic
Gneiss
Foliated Metamorphic Rock
metamorphic
Wood Stone (Dragon Stone variant)
Argillaceous Sedimentary Rock
sedimentary