Metamorphic Or Sedimentary Depending On Local Grade

Chert Arrowhead (Projectile Point)

Chert (Cryptocrystalline Quartz, SiO2)

Garnet Schist

Almandine-Garnet Schist

Ruby

Corundum (Al2O3 with Chromium traces)

Pyrite

Iron Sulfide (FeS2)

Banded chert or siliceous shale

Microcrystalline quartz (SiO₂), possibly interbedded with carbonaceous or clay-rich shale

Chert (Jasper)

Cryptocrystalline Silica (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz Mica Schist

Mica-Quartz Schist (Chemical: SiO2 + KAl2(AlSi3O10)(OH)2)

Mixed Rock Collection (Pebbles and Stones)

Various geological specimens

Granite Gneiss

Gneiss (High-grade Metamorphic Rock)

Slate

Slate (Metamorphic rock)

Gneiss

Gneiss (High-grade metamorphic rock)

Chert (Jasper/Opaline variety)

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Red Jasper

SiO2 (Microcrystalline Quartz)

Gneiss

Gneiss (Metamorphic high-grade)

Granite

Intrusive Igneous Rock

Charoite

(K,Sr,Ba,Na)15-16(Ca,Na)32[Si6O11(O,OH)2]2[Si12O18(O,OH)6]2[Si17O25(O,OH)18]2(OH,F)4 · nH2O

Conglomerate

Conglomerate (clastic sedimentary rock)

Foliated Gneiss

Gneiss (Metamorphic Rock)

Gneiss

Foliated Metamorphic Gneiss

Gneiss

Gneissic Metamorphic Rock

Kyanite in Quartz

Kyanite (Al2SiO5) with Quartz (SiO2)

Serpentine

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

Quartz Boulder

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Riverstone (likely Gray Slate or Siltstone)

Metamorphosed fine-grained sedimentary rock (Argillite/Slate)

Gneiss

Gneiss

Gneiss

Gneiss

Gneiss

Gneiss

Banded Sandstone / Quartzite Pebble

Quartzose Arenite with Iron Oxide Banding

Gneiss

Gneiss (High-grade metamorphic rock)

Mica Schist

Mica Schist (primarily composed of Muscovite/Biotite)

Granitic Gneiss

Gneiss (high-grade metamorphic rock)

Quartz

Silicon Dioxide (SiO2)

Feldspathic Gneiss (Granite Gneiss)

Gneiss (High-grade Regional Metamorphic Rock)

Schist (Kyanite Schist)

Kyanite-Mica Schist (primarily Al2SiO5, KAl2(AlSi3O10)(OH)2, and SiO2)

Green Mica Schist

Mica Schist (Fuchsite or Chlorite variety)

Gneiss

Gneiss

Gneiss

Gneiss

Gneiss

High-grade Metamorphic Gneiss

Gneiss

Foliated Metamorphic Rock