Vesicular Basalt with Oxidation
Scoriaceous Olivine Basalt (Mafic volcanic rock)
igneous
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
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Sandstone
Arenite (SiO2 based with quartz, feldspar, or lithic fragments)
sedimentary
Pumice
Vesicular volcanic glass (primarily SiO2)
igneous
Chert (Iron-stained)
Silicon Dioxide (SiO2)
sedimentary
Basalt
Basalt
igneous
Jasper (Milky/Cream Variety)
Silicon Dioxide (SiO2) - variety of Chalcedony
sedimentary (chemical/biological)
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Conglomerate
Clastic sedimentary rock (Conglomerate)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Basalt
Basalt
igneous
Sandstone Beach Pebble
Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)
sedimentary
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
River Cobble (Basaltic/Andesitic)
Mafic Igneous Porphyritic Rock
igneous
Sandstone (likely Arkosic or Quartzose)
Arenite (SiO2 based with mineral inclusions)
sedimentary
Basalt (Beach Pebble)
Extrusive mafic igneous rock
igneous
Chert (Yellow Jasper)
Silicon Dioxide (SiO2)
sedimentary
Tumbled sodalite (probable)
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Coal (Anthracite or Bituminous)
Lithified plant matter (Carbon)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (with cross-bedding)
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Chert (Jasper/Flint variety)
Silicon dioxide (SiO2)
sedimentary
River Stone (likely Basalt or Greywacke)
Basalt with mineral veining
igneous
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Chert (specifically Novaculite or Porcelainite)
Microcrystalline to Cryptocrystalline Quartz (SiO2)
sedimentary
Copper Ore with Malachite and Chalcocite
Copper-bearing Mineral Assemblage (Cu2CO3(OH)2 + Cu2S)
mineral
Quartzite Pebbles
Quartzite (SiO2)
metamorphic
Sandstone
Arenite (Siliclastic sedimentary rock, primarily SiO2)
sedimentary
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Chert (Banded)
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Chert (Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Greenschist
Greenschist facies rock
Metamorphic
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Chert (Green variety)
Silicon Dioxide (SiO2)
sedimentary
Quartzite River Stone
Quartzite (primarily SiO2)
metamorphic
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Diorite
Phaneritic intermediate plutonic rock
igneous
Blue Topaz
Al2SiO4(F,OH)2
gemstone
Sandstone
Arenite (SiO2 principal component)
sedimentary