Granite
Felsic intrusive igneous rock
igneous
Category
Man Made Rock (Technosol)
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Granodiorite
Granodiorite
igneous
Basalt (Vesicular)
Vesicular Basalt
igneous
Sandstone
Arenite (SiO2 based with quartz grains)
sedimentary
Granite
Intrusive igneous rock
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Pumice
Pumice (volcanic rock)
Igneous
Schist (Oxidized)
Mica Schist with Iron Oxide staining
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone (with potential fossil inclusions)
Calcium Carbonate (CaCO3)
sedimentary
Limestone (Grey and White specimens)
Calcium Carbonate (CaCO3)
sedimentary
Fossil Shell
Phylum Mollusca (Bivalvia or Brachiopoda)
fossil
Tumbled Agate
Silicon Dioxide (Chalcedony variety), SiO2
mineral
Sandstone (Ferruginous)
Arenite (Fe2O3 stained)
sedimentary
Black-and-white gneiss
Gneiss, chiefly quartz–feldspar with dark biotite/amphibole bands
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Porphyritic Igneous Rock / Basalt or Andesite Xenolith in Granite or Quartzite
Silicate rock with contrasting xenolith/inclusion
igneous
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2) with various iron-oxide inclusions
mineral
Shatter Cone
Impactite (Shatter Cone texture)
metamorphic
Granite
Intrusive igneous rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Basalt
Basalt (Extrusive Mafic Igneous)
igneous
Basalt pebble
Basalt (mafic extrusive rock)
igneous
Basalt
Basalt (Extrusive Mafic Igneous)
igneous
Basalt (Road Aggregate Specimen)
Aphanitic mafic volcanic rock
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt with Quartz Vein
Mafic Igneous Rock (SiO2 filling)
igneous
Granite Pebble
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Basalt
Basalt
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt
Mafic volcanic rock (Primarily Plagioclase Feldspar and Pyroxene)
Igneous
Basalt
Mafic Extrusive Igneous Rock
igneous
Basalt
Extrusive mafic igneous rock
igneous
Agate
Silicon Dioxide (SiO2)
mineral
Granite / Gneiss (Felsic Metamorphic or Igneous Rock)
Gneiss (or weathered Granite)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Eclogite
Eclogite (Omphacite-Garnet Metamorphic Rock)
metamorphic
Eclogite
Eclogite (composed primarily of Omphacite and Garnet)
metamorphic
Basalt River Pebble
Extrusive mafic igneous rock
igneous
Limestone
Calcite rock (CaCO3)
sedimentary
Fossil Coral
Rugosa or Tabulata coral fossil (Calcium Carbonate, CaCO3)
fossil
Shale
Argillaceous sedimentary rock
sedimentary