Metamorphic Or Igneous (Context Dependent)

Banded Gneiss (with Quartz Vein)

Gneiss (Metamorphic rock of varying mineralogy)

Greenstone

Greenschist / Meta-basalt

Gneiss (Metamorphic Rock)

Gneiss

Likely weathered mica-rich rock fragment

Probable schist, composed mainly of quartz, feldspar, and mica

Serpentine Pebble

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

Aventurine Quartz

Silicon Dioxide (SiO2) with inclusions (typically Fuchsite/Mica)

Greenschist

Greenschist (composed of Chlorite, Actinolite, and Epidote)

Quartz-rich rock fragment, possibly granite or quartzite

Primarily quartz (SiO₂), with possible feldspar and iron-oxide staining

Schist

Mica Schist

Pyrite

Iron Sulfide (FeS2)

Mixed Gemstone Beaded Jewelry

Various minerals (e.g., Quartz varieties like Rose Quartz, Amethyst; Peridot; Garnet; etc.)

Rounded quartz-rich pebble, possibly granite or gneiss

Indeterminate granitoid; likely quartz–feldspar–biotite aggregate

Black Star Diopside (beads)

Diopside (CaMgSi2O6) - a member of the pyroxene group

Greenstone

Metabasalt / Greenschist facies rock

Mica Schist fragment

Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3(AlSi3O10)(OH)2)

Gneiss

Gneiss

Greenstone Pebbles (Basalt/Diabase)

Metamorphosed Mafic Rock (Greenstone)

Greenstone

Chlorite schist / Meta-basalt

Greenstone / Greenschist

Greenschist (metamorphosed mafic rock)

Gneiss

Gneiss

Gneiss

Gneiss

Gneiss (Banded Gneiss)

Gneiss

Greenschist

Greenschist (Chlorite-actinolite schist)

Pink Granite Gneiss

Granitic Gneiss

Banded Gneiss

Gneiss

Healer's Gold (Pyrite and Magnetite in Schist)

Magnetite (Fe3O4) and Pyrite (FeS2) in Mica Schist

Greenstone Pebble

Metabasalt (often containing chlorite, actinolite, or epidote)

Gneiss

Gneiss

Gneiss (Schistose)

Gneiss

Greenstone / Nephrite Jade

Tremolite-actinolite series (Ca2(Mg,Fe)5Si8O22(OH)2)

Greenstone

Metabasalt (composed mainly of chlorite, epidote, and actinolite)

Greenstone (Metabaltic/Greenschist)

Chlorite schist / Meta-basalt

Gneiss

Gneiss

Quartz with Epidote

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

Greenstone (Epidote/Chlorite Schist)

Metabasalt (composed primarily of Epidote Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH) and Chlorite (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)

Weathered quartz-rich pebble

Likely quartz-bearing granite or granitic gneiss; exact identification requires testing

Glacial Cobble (likely Granitic or Gneissic)

Granite/Gneiss Glacial Erratic

Greenstone

Metabasalt / Greenschist

Greenschist / Basalt Beach Pebble

Metabasalt / Chlorite Schist

Gneiss

Gneiss

Fuchsite Schist with Quartz

Chromian Muscovite [K(Al,Cr)2(AlSi3O10)(OH)2] Schist

Gneiss

Gneiss