Sedimentary Rock (Metamorphosed)

Polished reddish-brown granite or granitic gneiss slab

Granite, chiefly quartz, feldspar, and mica; possibly foliated as gneiss

Weathered quartz-rich rock, likely sandstone or quartzite

Quartz (SiO₂)-rich sandstone; possibly partially metamorphosed quartzite

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Light-colored granite or granitic gneiss

Granite; typically quartz + feldspar + mica (variable composition)

Likely mica-rich schist

Mica schist, composed mainly of quartz and mica (muscovite and/or biotite)

River Stone (Green Quartzite)

Quartzite (Metamorphosed Sandstone)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartz with Mica Schist

Quartz-Mica Schist / Pegmatitic Quartz

Yellow Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Likely amphibolite

Amphibolite, composed chiefly of hornblende and plagioclase feldspar

Serpentine-bearing schist (likely chlorite–talc schist)

Ultramafic-derived greenschist; serpentine-group minerals, chlorite, talc, and possibly actinolite

Gold-bearing quartz or iron-stained quartzite

Quartz (SiO₂), possibly with pyrite or native-gold flecks

Metamorphosed mafic rock, likely amphibolite

Amphibolite, chiefly hornblende + plagioclase; possibly mafic gneiss or altered basalt

Quartzite (Banded)

Metamorphosed Sandstone (SiO2 with impurities)

Picasso Jasper (also known as Picasso Marble)

Metamorphosed Limestone (Calcium Carbonate with impurities)

Coal (Anthracite)

Anthracite (Metamorphosed Coal)

Anthracite Coal

Anthracite (Metamorphosed Coal)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite (Pink / Peach)

SiO2 (Metamorphosed Quartz Sandstone)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Eclogite

Eclogite (Omphacite-Garnet rock)

Anthracite Coal

Anthracite (Metamorphosed Carbon)

Anthracite Coal

Anthracite (Metamorphosed Carbon)

Weathered quartz-rich rock, likely sandstone or quartzite

Quartz sandstone (possibly weakly metamorphosed quartzite); predominantly SiO₂

Weathered quartz-rich cobble (probable sandstone or quartzite)

Indeterminate; likely quartz arenite sandstone, possibly weakly metamorphosed quartzite

Banded limestone or marble

Calcite-rich carbonate rock; likely veined limestone, possibly low-grade marble (CaCO₃)

Serpentinite

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

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Chalcopyrite-bearing metamorphic rock (possibly bornite/chalcopyrite ore)

Likely quartz–sulfide rock containing chalcopyrite (CuFeS₂); identification from the image is tentative

Quartzite Pebble

Metamorphosed Quartz-rich Sandstone

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Blue Quartzite

Metamorphosed Quartz (SiO2) with inclusions

Quartzite with Quartz Veining

Metamorphosed Sandstone (SiO2 with impurities)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite (River Pebble)

Metamorphosed Quartz Sandstone (SiO2)