Metamorphic Or Sedimentary Depending On Local Grade

Weathered mica-rich schist

Muscovite/biotite schist, likely quartz-bearing

Gneiss

Gneiss (Foliated Metamorphic Rock)

Foliated metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica gneiss/schist; exact identification requires petrographic examination

Copper Ore (Malachite/Chrysocolla bearing)

Cupriferous rock containing secondary copper minerals like Cu2CO3(OH)2

Gneiss

Gneiss

Schist

Schist (various mineral compositions)

Conglomerate

Conglomerate (clastic sedimentary rock)

Garnet-bearing schist or gneiss

Garnet-mica schist/gneiss; chiefly quartz, feldspar, mica, and almandine–pyrope garnet

Weathered iron-rich rock, possibly garnet schist or mica schist

Foliated metamorphic rock; likely mica schist with iron oxides and quartz, but exact identification is uncertain from the image

Gneiss

Gneiss

Whetstone

Novaculite

Quartz (Smoky/Milky variety with inclusion)

Silicon Dioxide (SiO2)

Milky Quartz with Matrix

Quartz (Silicon Dioxide, SiO2)

Iron-rich quartzite or ironstone

Ferruginous quartzite, likely quartz (SiO₂) with hematite/goethite (Fe₂O₃/FeO(OH))

Quartz (Smoky/Milky variety with matrix)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Banded metamorphic rock, likely gneiss or metasedimentary slate

Quartz–feldspar–mica gneiss (tentative), possibly containing iron-oxide veins

Likely slate or fine-grained metamorphic rock

Slate; predominantly microcrystalline quartz, mica, and clay minerals

Quartz Pebble with Host Rock / Schist Matrix

Silicon Dioxide (SiO2) with Metamorphic Host Rock

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Banded metamorphic rock, likely mica schist

Mica schist, probably muscovite–biotite schist with quartz and feldspar

Tumbled black stone, likely black tourmaline or obsidian

Schörl tourmaline: NaFe3Al6(BO3)3Si6O18(OH)4, or volcanic glass (obsidian: mainly SiO2)

Likely biotite-rich schist with a quartz/feldspar inclusion

Mica schist; chiefly quartz (SiO₂), feldspar, and biotite mica

Gneiss (with iron staining)

Gneiss

Granite Glacial Erratic

Granite (Phaneritic Quartz-Feldspar Plutonic Rock)

Polished breccia (decorative stone)

Likely carbonate breccia: angular carbonate-rock fragments in a calcite-rich matrix; exact identification requires testing

Foliated metamorphic rock, likely slate or phyllite

Slate–phyllite; primarily quartz, mica, and clay-derived minerals

Blue-gray metamorphic rock, likely slate or phyllite

Fine-grained foliated metapelite; commonly mica- and chlorite-rich

Anthracite Coal

Anthracite

Flint or chert flake/tool

Microcrystalline quartz (chalcedony), SiO₂

Quartz

Silicon Dioxide (SiO2)

Blue Kyanite

Kyanite (Al2SiO5)

Slate

Slate (Foliated Metamorphic Rock)

Crushed Granite and Quartz Gravel

Composite Igneous and Silicate Rock Aggregate

Greenstone or Epidote-rich rock

Epidote or Chlorite schist/greenstone

Pumice

Vesicular volcanic glass

Garnet amphibolite / Metamorphic Rock

Garnet Amphibolite (Hornblende - Almandine schist/gneiss)

Milky Quartz

Silicon Dioxide (SiO2)

Granite

Phaneritic Plutonic Felsic Rock (Granite)

Weathered sandstone fragment

Quartz-rich sandstone, possibly ferruginous sandstone

Fuchsite in Quartz (or Emerald in Fuchsite / Verdite)

Chromian Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Quartz Matrix

Weathered quartz-bearing rock, possibly iron-stained quartzite

Quartzite (mostly SiO₂), tentatively identified