Man Made Rock (Technosol)

Basalt River Pebble

Basalt (Aphanitic Mafic Volcanic Rock)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Sandstone

Clastic Sedimentary Rock (composed mostly of quartz and/or feldspar)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Quartzite (Milky Quartz pebble)

Silicon Dioxide (SiO2)

Red Quartzite / Metasandstone River Pebble

Quartzite (primarily SiO2 with hematite inclusions)

Iron-stained Quartzite / Chert

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Schist

Schist (primarily mica-schist)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Banded Chert (River Cobble)

Microcrystalline Quartz (SiO2)

Red Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Hypersthene

Hypersthene (formula: (Mg,Fe)SiO3)

Ferruginous Siltstone or Mudstone

Ferruginous Siltstone / Goethitic Sandstone

Quartz (Milky and Smoky variety)

Silicon Dioxide (SiO2)

Scoria

Extrusive Igneous Rock (Basaltic/Andesitic Composition)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Iron-stained)

Silicon Dioxide (SiO2)

Red Jasper (Heliotrope family variant)

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

Quartz Pebble (Geode-like)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Pink Granite

Granite (composed primarily of Quartz, K-Feldspar, and Plagioclase)

Limonite-stained Quartz / Quartzite

Silicon Dioxide (SiO2) with iron hydroxides (FeO(OH)·nH2O)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Travertine (Tufa)

Chemical Sedimentary Limestone (CaCO3)

River Cobble (Quartzite with Iron Staining)

Metamorphic Quartzite (SiO2 with Fe2O3 inclusions)

Tufa

Calcareous Tufa (CaCO3)

Granite (Pink/Red Orthoclase variety)

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)

Granite

Granite (a felsic intrusive igneous rock)

Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Granite

Granite (Felsic intrusive igneous rock)

Porphyritic Basalt (Chinese Writing Stone or Flower Stone)

Porphyritic Basalt / Porphyry

Sandstone (with manganese staining)

Clastic sedimentary rock (primarily SiO2)

Sandstone (Micaceous)

Arenite (composed primarily of SiO2)

Sandstone

Arenite (a specific type of sandstone with less than 15% matrix)

Druzy Quartz on Host Rock

Silicon Dioxide (SiO2)

Diorite

Intrusive Igneous Rock (Intermediate Composition)

Pumice

Pumice (a highly vesicular volcanic rock)

Dalmatian Stone (commonly Dyed)

Dalmatian Jasper (Peralkaline igneous rock)

Gneiss

Gneiss (High-grade metamorphic rock)

Sandstone (specifically Lithic or Quartz Arenite)

Arenite (composed primarily of SiO2)

Sandstone with Foliose Lichen

Arenite (Rock matrix) with Xanthoparmelia or Flavoparmelia (Lichen genus)

Basalt River Cobble

Basalt (Aphanitic Mafic Volcanic Rock)