Metamorphic Rock (Formed From A Fibrous Crocidolite Asbestos)

Quartz with Mica inclusions (likely Schist or Gneiss host)

Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)

Epidote

Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

Schist (Biotite/Mica Schist)

Medium-grade regional metamorphic rock (rich in Phyllosilicates)

Garnetiferous Pegmatite

Pegmatite with Almandine Garnet and Muscovite

Quartzite

Quartzite (primarily SiO2)

Banded Gneiss

Gneiss (typically quartz, feldspar, mica, amphibole composition)

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Garnet (Red Garnet)

Garnet Group. The red varieties seen in jewelry are typically Almandine (Fe3Al2(SiO4)3), Pyrope (Mg3Al2(SiO4)3), or a mix of the two (pyrope-almandine series).

Epidote (Unakite variety)

Epidosite (Metasomatic rock containing Ca2(Al,Fe)3(SiO4)3(OH))

River Pebble (likely Quartzite or Chert)

Silicon Dioxide (SiO2)

Unakite

Epidotized Granite (SiO2 with Ca2(Al, Fe)3(SiO4)3(OH))

Quartz (vein quartz)

SiO2 (Silicon Dioxide)

Malachite

Copper carbonate hydroxide, Cu2CO3(OH)2

Sapphire (Corundum)

Corundum (Al2O3)

Gneiss

Gneiss (High-grade metamorphic rock)

Fossilized Wood (with Coal and Limonite)

Petrified Wood (Silicified or Carbonized Flora)

Quartzite

Quartzite (primarily SiO2)

Unakite

Epidotized Granite

Unakite

Epidotized Granite

Lapis Lazuli

Na8[Al6Si6O24]Sn (Lazurite-rich metamorphic rock)

Quartzite River Rock (with Quartz Vein)

Quartzite (SiO2)

Grey River Stone (Gneiss/Schist mix)

Foliated Metamorphic Rock (variable mineral formula)

Unakite

Epidotized Granite

Lapis Lazuli (Tumbled)

Lazurite-dominated contact metamorphic rock

Quartzite (Iron-stained)

Metamorphosed Quartz-rich Rock (SiO2)

Biotite (Mica)

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

Granitic Gneiss

Gneiss (high-grade metamorphic rock primarily of quartz, feldspar, and mica)

Quartzite

Quartzite

Garnet Schist

Almandine Garnet in Mica Schist (Fe3Al2(SiO4)3)

Quartzite Pebble

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

SiO2 (Silicon Dioxide)

Quartzite

Quartzite (primarily Silicon Dioxide, SiO2)

Unakite (Epidote-Rich Granite)

Unakite (Granite consisting of Orthoclase, Quartz, and Epidote)

Rose Quartz

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

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within metamorphic/igneous matrix

Unakite

Unakite Epidosite (Granite with epidote and orthoclase)

Smoky Quartz and Biotite Schist

Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Quartz

Quartz (SiO₂)

Green Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Garnet (likely Pyrope or Almandine)

Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.