Man Made Rock Like Material

Lapis Lazuli

Lapis Lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Pyrite, and Calcite)

Pyrite

Iron Sulfide (FeS2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (likely Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Chert

Microcrystalline Quartz (SiO2)

Chert (Holey Stone)

Microcrystalline Quartz (SiO2)

Sandstone (likely Graywacke or Arkose variant)

Clastic Sedimentary Rock (SiO2 based)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Unakite

Epidotized Granite

Limonite (Ironstone)

Limonite (mixture of hydrated iron oxides, primarily Goethite α-FeO(OH))

Sandstone Cobble

Arenite (Secondary classification based on grain size)

Sandstone (likely Arkosic)

Clastic Sedimentary Rock

Sandstone (likely Arkosic or Quartzose)

Sandstone (SiO2 with inclusions)

Pyrite

Iron Disulfide (FeS2)

Orbicular Granite (specifically Mustard or Yellow Tonalite/Granodiorite)

Orbicular Quartz Diorite / Tonalite

Chert (specifically Gray/Blue-Gray Chert)

Chert (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Basalt

Basalt (composition of plagioclase feldspar and pyroxene)

Sandstone

Arenite (composed primarily of SiO2)

Crushed Stone (Likely Granite or Diabase)

Intrusive Igneous Rock (Granitoid/Gabbroid)

Shale

Fissile mudrock (composed of clay-sized particles and detrital grains)

Petrified Wood

Silicified Wood (SiO2)

Chert

Siliceous sedimentary rock (predominantly microcrystalline quartz, SiO2)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (with Feldspathic/Arkose qualities)

Arenite (primarily SiO2 with KAlSi3O8 components)

Sandstone

Arenite (primarily SiO2)

Limestone

Calcium Carbonate (CaCO3)

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Fossiliferous Chert (with Fossil Shells)

Silicon Dioxide (SiO2) with biogenic inclusions

Biotite (Black Mica)

Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2

Quartzite

Quartzite (Primary mineral: Quartz, SiO2)

Rutilated Quartz

Quartz (SiO2) with Rutile (TiO2) inclusions

Quartzite Pebble

Quartzite (SiO2)

BROWN GRANITE (likely 'Tan Brown' or similar)

Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)

Quartz (variety of colors)

SiO2 (Silicon Dioxide)

Petrified Wood

Silicified Wood (SiO2)

Sandstone with Ironstone Concretion

Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))

Sandstone (Stream-rounded Cobble)

Arenite (composed primarily of SiO2, Silica)

Basalt River Stone

Basalt (Aphanitic Mafic Igneous Rock)

Red Jasper

Silicon dioxide (SiO2) with iron oxide (Fe2O3) inclusions