Metamorphic Or Sedimentary Depending On Local Grade

Biotite mica schist

Mica schist dominated by biotite (K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂), with quartz and feldspar

Ferruginous Quartz

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Mica schist

Schist (rich in Muscovite or Biotite mica)

Tumbled honey quartz (likely iron-stained quartz)

Quartz, silicon dioxide (SiO₂), with limonite/goethite inclusions or surface staining

Green Greenstone / Celadonite-bearing Metamorphic Rock

Greenschist / Celadonite / Serpentinitic pebble

Greenstone, possibly serpentine or altered basalt

Serpentinite (Mg₃Si₂O₅(OH)₄) or chlorite-epidote altered basalt; identification is uncertain from the image

Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Greenstone / Serpentinite

Antigorite and Lizardite mixture (Mg3Si2O5(OH)4)

Charoite

Charoite (K(Ca,Na)2Si4O10(OH,F)·H2O)

Epidote in Granite Gneiss

Epidote bearing Orthogneiss (Ca2(Al,Fe)3(SiO4)3(OH))

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Mystic Topaz (Treated Quartz or Topaz)

Aluminum silicate fluoride hydroxide [Al2SiO4(F,OH)2] with thin-film metallic coating

Ruby in Zoisite

Anyolite (combination of Ca2Al3(SiO4)3(OH) and Al2O3:Cr)

Sapphire in a ring

Corundum (Al2O3)

Morganite and Aquamarine (Beryl) Bracelet

Beryllium aluminum silicate, Be3Al2(SiO3)6

Green Slag Glass

Amorphous Silica Glass (Anthropogenic)

Jasper with Epidote

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate (Ca2(Al,Fe)3(SiO4)3(OH))

Weathered gray metamorphic rock, likely phyllite or slate

Micaceous quartz–phyllosilicate rock; commonly quartz + muscovite/illite ± chlorite

Greenstone, likely chlorite-rich schist

Chlorite schist; chiefly chlorite, actinolite/amphibole, feldspar, and quartz

Tumbled carnelian/chalcedony (probable)

Microcrystalline quartz, SiO₂; orange-red variety commonly called carnelian

Greenstone / altered mafic rock

Likely chlorite–actinolite metabasalt (greenschist); exact identification requires testing

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Feldspar-rich Granite (or Gneiss) Pebble

Granite (primarily Orthoclase Feldspar and Quartz)

Dark slate or fine-grained metamorphic rock

Slate; chiefly fine-grained phyllosilicates, quartz, and feldspar

Fossiliferous Kalkstein (Marl/Sandstone)

Fossiliferous calcarenite/siltstone

Almandine Garnet in Schist

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

Pebbles

Polymictic rock fragments

Weathered quartz-rich rock, likely granite or granitic gneiss

Granite–gneiss assemblage; mainly quartz (SiO₂), feldspar, and minor mica/amphibole

Phyllite

Phyllite

Sugilite

KNa2(Fe,Mn,Al)2Li3Si12O30

Iron-stained quartz-bearing rock, possibly weathered granite or gneiss

Quartz–feldspar rock with iron-oxide staining; exact identification requires testing

Banded Iron Formation (BIF) / Tiger Iron

Ferruginous Chert (primarily Quartz [SiO2] and Hematite/Magnetite [Fe2O3/Fe3O4])

Greenstone or Chlorite Schist

Greenschist / Chlorite schist

Quartzite pebble (likely)

Quartzite; predominantly microcrystalline quartz (SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Greenschist / Serpentinite Cobble

Greenschist (composed primarily of chlorite, actinolite, and epidote)

Flint / Chert Arrowhead

Microcrystalline Quartz (SiO2)

Gold Ore in Quartz

Native Gold (Au) in Quartz (SiO2)

Bivalve Fossil (Clam/Mollusk)

Class: Bivalvia (Order: Veneroida), Calcium Carbonate (CaCO3)

Gneiss (likely banded granitic gneiss)

Quartz–feldspar–mica gneiss; commonly containing biotite and hornblende

Aura Quartz Bead

Silicon dioxide (SiO2) with metal coating

Fossilized bivalve or ammonite fragment

Calcareous fossil; likely a mollusk shell preserved as calcite (taxonomic identification uncertain)