Sedimentary Rock (Metamorphosed)

Quartzite with Iron Inclusions

Metamorphosed Sandstone (SiO2 dominated)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Tumbled granite or granitic gneiss pebble

Granite/granitic gneiss, chiefly quartz, feldspar, and dark biotite or amphibole

Dark gray slate (possibly argillite or shale)

Slate, a low-grade metamorphic rock derived mainly from shale; composition commonly quartz, illite/muscovite, chlorite, and clay minerals

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Tumbled yellow jasper or iron-stained quartzite

Microcrystalline quartz (SiO₂), likely jasper/quartzite with iron-oxide staining

Rounded quartz-rich pebble

Likely quartzite or quartz-bearing sandstone; composition mainly SiO₂ with possible feldspar and iron-oxide impurities

Quartzite (River Pebble)

Metamorphosed Quartz Sandstone (SiO2)

Quartzite Beach Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartzite (River Pebble)

Metamorphosed Quartz Sandstone (SiO2)

Quartzite with Quartz Vein

SiO2 (Metamorphosed Quartz Sandstone)

Unidentified gray weathered rock

Possibly weathered granite or granitic gneiss; exact identification requires a fresh surface and tests

Quartzite

Quartzite (Metamorphosed Quartz Sandstone)

Brecciated quartzite (likely iron-stained quartz vein material)

Quartzite; predominantly quartz (SiO₂), with dark iron/manganese-oxide or mica-rich seams

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

Green Quartzite / Aventurine

SiO2 (Metamorphosed Quartz Sandstone)

Quartzite with Vugs

Metamorphosed Quartz Sandstone (SiO2)

Red Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Coarse-grained granite or granitic gneiss

Granite; primarily quartz, potassium feldspar, plagioclase, and biotite/hornblende

Quartz-rich breccia or quartzite with iron-oxide veining

Microcrystalline to granular SiO₂ (quartz), with hematite/goethite and minor feldspar or mica

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Metamorphosed Sandstone (Mainly SiO2)

Quartzite (Tumbled Pebble)

Metamorphosed Quartz Sandstone (SiO2)

Iron-rich quartzite or ironstone

Ferruginous quartzite; predominantly quartz (SiO₂) with hematite/goethite (Fe₂O₃/FeO(OH))

Quartzite (Ferruginous)

Metamorphosed Quartz Sandstone (SiO2)

Gray Slate Pebble

Slate (metamorphosed mudstone/shale)

Weathered quartz-rich rock, likely sandstone or quartzite

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

Weathered greenstone

Metamorphosed mafic rock, commonly chlorite–actinolite schist or altered basalt

Quartzite

Quartzite (Metamorphosed Quartz Sandstone)

Weathered granite or granitic gneiss

Granite: quartz, feldspar, and mica; possibly weakly foliated gneiss

Quartzite with Epidote Vein

Metamorphosed Quartz Sandstone with Hydrothermal Vein

Banded Slate (Lithified Mudstone)

Low-grade Metamorphosed Mudstone / Slate

Quartzite Cobble with Iron Staining

Metamorphosed Quartz Sandstone (SiO2)

Quartzite (River Stone)

Metamorphosed Quartz Sandstone (SiO2)

Greenstone / Basalt with Amygdule

Amygdaloidal Basalt (altered to Greenstone)

Banded iron formation (iron-rich metamorphic rock)

Banded iron formation (BIF), chiefly hematite/magnetite with chert or quartz (Fe₂O₃/Fe₃O₄ and SiO₂)

Feldspar-rich igneous rock, likely granite or gneiss fragment

Granite-like quartz–feldspar rock; exact identification is uncertain from the blurred image

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite (Quartz Pebble)

Quartzite (SiO2 with iron oxide inclusions)