Metamorphic Rock (Specifically A Rock Composed Of Minerals)

Quartz (likely milky/rose quartz variety)

Quartz (SiO2 - Silicon Dioxide)

Limonite Concretion

Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)

African Turquoise (Jasper)

Polychrome African Jasper (often marketed as 'African Turquoise' due to its color, but it is not true turquoise)

Chert (specifically Gray/Tan Bedded Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Quartzite (River Pebble)

Metamorphosed Quartz Sandstone (SiO2)

Iron-stained Quartzite

Quartzite with Limonite/Hematite staining (SiO2 with FeO(OH)·nH2O)

Quartzite Pebble

Recrystallized Quartz (SiO2)

Serpentine

Serpentine Group (primarily Antigorite or Lizardite), Mg3Si2O5(OH)4

Diorite

Diorite (Intermediate intrusive igneous rock)

Quartz (likely a macrocrystalline variety like milky quartz or smoky quartz, given the appearance in the image)

Quartz (SiO₂ - Silicon Dioxide)

Granite

Phaneritic Igneous Rock (composed mostly of Quartz, Alkali Feldspar, and Plagioclase)

Quartzite

Quartzite (primarily SiO2)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)

Chert (specifically tan/pink variety)

Silicon Dioxide (SiO2)

Granite

Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Quartz (Quartzite)

Silicon Dioxide (SiO2)

Epidosite

Epidosite (Metasomatic rock consisting mainly of Epidote and Quartz)

Ferruginous Quartzite (Iron-stained Quartzite)

Quartzite with Iron oxides (FeO(OH) / Fe2O3)

Iron-Stained Quartz (Riverside Cobble)

Silicon Dioxide (SiO2) with Limonite/Hematite inclusions

Quartzite Pebble

Metamorphic Quartz (SiO2)

Quartzite

Quartzite (Primary mineral: SiO2)

Quartzite

Quartzite (primarily SiO2)

Ferruginous Sandstone

Clastic sedimentary rock (primarily Quartz with Iron Oxide cement)

Lapis Lazuli

A metamorphic rock primarily composed of lazurite (Na,Ca)8[(S,SO4,Cl)2|(Al6Si6O24)], calcite (CaCO3), and pyrite (FeS2).

Banded Chalcedony (Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Serpentinite

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

Peach Aventurine

Quartz variety (SiO2 + Hematite/Goethite inclusions)

Green Quartzite (River Stone)

Metamorphic Quartz (SiO2) with inclusions (typically Fuchsite or Chlorite)

Unakite

Unakite (metasomatized granite)

Serpentine (Serpentinite)

Antigorite, Lizardite, or Chrysotile; (Mg,Fe)3Si2O5(OH)4

Unakite

Unakite (Epidotized Granite)

Quartzite

Quartzite (SiO2)

Unakite

Unakite (Episyenite composition: Feldspar, Epidote, and Quartz)

Red Quartzite (Ferruginous Quartz)

Quartzite (SiO2 with Fe2O3 inclusions)

Quartzite (River Pebble)

SiO2 (recrystallized Quartz)

Serpentinite

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

Unakite (Tumbled)

Epidotized Granite

Limonitic Quartzite

Metamorphosed sandstone with Limonite (FeO(OH)·nH2O) staining

Unakite

Epidotized Granite

Granite

Phaneritic Felsic Igneous Rock (Granite)

Quartz / Common Opal Transition

Silicon Dioxide (SiO2)