Sedimentary And Metamorphic

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.

Quartz Pebble

Silicon Dioxide (SiO2)

Schist

Schist (Foliated Metamorphic Rock)

Mica Schist

Mica Schist (primarily composed of Muscovite/Biotite)

Quartz (likely a form of massive or vein quartz)

Quartz (SiO₂)

Gneiss

Gneiss (Metamorphic Rock)

Gneiss

Metamorphic rock (Gneiss)

Banded Gneiss

Gneiss (Metamorphic Rock)

Dark metamorphic rock, likely schist or phyllite

Quartz–mica schist/phyllite; chiefly quartz, mica, and feldspar

Banded Gneiss

Gneiss (SiO2 enriched metamorphic rock)

Gneiss

Gneiss (Metamorphic Rock)

Gneiss

Gneissic Metamorphic Rock

Gneiss (Metamorphic Pebble)

Gneissic Metamorphic Rock

Gneiss

Gneissic Metamorphic Rock

Polished banded gneiss or schist pebble

Banded quartz–feldspar–mica gneiss (tentative)

Rounded stream pebbles (likely quartzite and iron-stained sandstone)

Quartzite (SiO₂), with a possible ferruginous sandstone pebble (quartz + iron oxides)

Gneiss

Feldspar–quartz–mica gneiss, locally amphibole-bearing

Epidote

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

Pink Rhodonite

Manganese Silicate (MnSiO3)

Banded gneiss

Gneiss, chiefly quartz–feldspar–mica

Garnet

Garnet (X3Y2(SiO4)3)

Tumbled quartz-rich pebble, likely quartzite or chert

Quartz (SiO₂), possibly quartzite; exact identification is uncertain from the image

Pyrite in Slate

Iron Disulfide (FeS2) in Low-grade Metamorphic Rock

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Calcite

Calcium Carbonate (CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Magnetite (Lodestone)

Magnetite (Fe3O4)

Graphite

Graphite (Native Carbon), Formula: C

Graphite

Graphite (Carbon, C)

Blue Kyanite

Kyanite (Al2SiO5)

Banded marble (probable calcite marble)

Calcite marble, CaCO₃; possibly impure dolomitic marble

Almandine Garnet in Matrix

Almandine, Fe3Al2(SiO4)3

Gneiss

High-grade Metamorphic Gneiss

Mica Schist

Mica Schist (predominantly Muscovite/Biotite Schist)

Sandstone pebble

Sandstone (arenite / quartzarenite)

Magnetite (Octahedral Crystal)

Magnetite (Fe3O4)

Magnetite

Magnetite (Fe3O4)

Magnetite (Lodestone)

Magnetite (Fe3O4)

Almandine Garnet in Matrix

Almandine Garnet (Fe3Al2(SiO4)3) in Schist/Quartz Matrix

Blue Kyanite

Kyanite (Al2SiO5)

Specular Hematite (Specularite)

Iron(III) oxide (Fe2O3)