Sedimentary Rock (Metamorphosed)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartz vein in greenstone

Milky quartz (SiO₂) cutting metamorphosed mafic rock, likely greenschist or amphibolite

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Banded Slate (Lithified Mudstone)

Low-grade Metamorphosed Mudstone / Slate

Sandstone or Quartzite Pebble

Arenite or Quartzite

Rounded river pebble, likely quartz-rich sandstone or quartzite

Indeterminate; probable quartz (SiO₂) with feldspar, iron-oxide staining, and minor lithic grains

Calcite

Calcium Carbonate (CaCO3)

Quartzite Cobble

Quartzite (SiO2)

Quartz-veined metamorphic rock

Likely quartz-veined schist or gneiss; exact identification requires closer examination

Weathered iron-rich quartz vein in altered host rock

Goethite–hematite limonite with quartz and iron-oxide alteration

Small rounded quartz-rich pebble

Likely quartz (SiO₂), possibly iron-stained chert or quartzite

Tumbled quartz-rich rock, possibly granite or quartzite

Quartz (SiO₂) with probable feldspar and mica; exact rock identification is uncertain from the image

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Likely weathered brown quartz-bearing rock

Tentatively weathered granite or granitic gneiss; exact identification is uncertain from the photograph

Dark metamorphic rock, possibly amphibolite

Amphibolite (tentative; commonly hornblende and plagioclase)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Green Quartzite (Tumbled)

Metamorphosed Quartz-rich Sandstone

Greenstone (Epidosite)

Epidosite (Metamorphosed Basalt/Diabase)

Quartzite Cobble

Metamorphosed Quartz Sandstone (SiO2)

Quartzite (River Pebble)

Metamorphosed Quartz Sandstone (SiO2)

Tumbled yellow-green pebble, likely serpentine or quartzite

Provisional: serpentine-group rock, chiefly Mg₃Si₂O₅(OH)₄; exact identification requires testing

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Gray Quartzite with Quartz Veining

Metamorphosed Quartz-rich Sandstone

Likely greenstone (serpentinized rock)

Serpentinite, predominantly serpentine-group minerals [Mg₃Si₂O₅(OH)₄]

Quartzite (with Iron Staining)

Metamorphosed Quartz Sandstone (SiO2)

Quartzite Cobble

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Tumbled greenstone/serpentine pebble

Serpentinite, chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), possibly with chlorite or talc

Quartzite (River Pebble)

Metamorphosed Quartz Sandstone (SiO2)

Rounded quartz-rich pebble

Likely microcrystalline quartz (chalcedony), possibly weathered quartzite

Greenschist

Chlorite schist

Tumbled reddish-brown stone, possibly jasper or quartzite

Uncertain; likely microcrystalline quartz (SiO₂), potentially iron-stained jasper

Red granite or granitic gneiss cobble

Quartz–feldspar–mica rock; likely granite, possibly gneiss

Quartzite with Quartz Vein

SiO2 (Metamorphosed Quartz Sandstone)

Weathered amphibolite or mafic metamorphic rock

Amphibolite; chiefly hornblende amphibole and plagioclase feldspar

Weathered sulfide-bearing rock, likely pyrite-rich schist

Pyrite (FeS₂) in mica/quartz-rich schist; exact identification requires testing

Tumbled greenstone, likely serpentinite

Serpentinite (predominantly serpentine-group minerals: Mg₃Si₂O₅(OH)₄)

Quartzite Beach Pebble

Metamorphosed Quartz Sandstone (SiO2)