Not A Natural Rock (Man Made Composite)

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Chert / Jasper

Microcrystalline Quartz (SiO2)

Zirconia (Ceramic) & Ion-X Glass

Zirconium Dioxide (ZrO2) and Ion-strengthened Aluminosilicate Glass

Vesicular Basalt (or Scoria)

Basalt (Aphanitic-Vesicular Mafic Igneous Rock)

Granite

Granite (Felsic intrusive igneous rock)

Blue Topaz (specifically London Blue shade)

Topaz - Al2SiO4(F,OH)2

Amethyst

Silicon dioxide (SiO2)

Smoky Quartz

Smoky Quartz (SiO2: Silicon Dioxide)

Basalt (River Rock Cobble)

Extrusive mafic volcanic rock (Basalt)

Basalt (River Pebble)

Extrusive mafic igneous rock

Quartz Mineral

Silicon Dioxide (SiO2)

Kambaba Jasper (Crocodile Jasper)

Stromatolite (Fossilized Algae)

Limonite with Hematite

Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)

Granite

Granite (a common rock type, not a single mineral; composed primarily of Quartz, Feldspar (Orthoclase and Plagioclase), and Mica (Biotite and/or Muscovite) and/or Amphibole)

Basalt Pebble

Extrusive Mafic Igneous Rock

Limonite (Iron Ore)

Limonite (an FeO(OH)·nH2O mineraloid, not a true mineral due to variable composition)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Basalt

Basalt (predominantly Plagioclase Feldspar and Pyroxene)

Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)

Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Vesicular Basalt

Basalt with vesicular texture

Basalt with Calcite Veins

Basalt (containing CaCO3 inclusions)

Pink Granite

Phaneritic plutonic igneous rock (Alkali-feldspar granite)

Andesite Porphyry

Andesite (extrusive volcanic rock)

Smoky Quartz and Clear Quartz Geode

Silicon Dioxide (SiO2)

Jasper Agate (specifically Brecciated Jasper)

Silicon Dioxide (SiO2) with iron oxide and clay impurities

Quartz

Silicon dioxide (SiO2)

Basalt River Stone

Basalt

Basalt (with Porphyritic/Vesicular texture)

Extrusive mafic igneous rock

Granodiorite (foreground) and Rose Quartz (background)

Granodiorite / Quartz (SiO2)

Quartzite

Quartzite (primarily SiO2)

Coquina / Fossiliferous Limestone

Calcite-rich Bioclastic Sedimentary Rock (CaCO3)

Granite

Granite (Silicic Plutonic Rock)

Sandstone

Arenite (primarily SiO2)

Basalt Pebble

Basalt

Basalt (Polished River Stone)

Basalt (Extrusive Mafic Volcanic Rock)

Quartz (pebble)

Quartz (SiO₂)

Unakite

Epidotized Granite

Quartz

Quartz (SiO2 - Silicon Dioxide)

Pink Feldspar (Orthoclase)

Orthoclase Feldspar (KAlSi3O8)

Smoky Quartz

Silicon Dioxide (SiO2)

Sandstone (Quartzose Pebble)

Clastic Sedimentary Rock (Litharenite/Quartz arenite)