Sedimentary Rock (Metamorphosed)

Weathered quartz-rich rock, possibly quartzite or granite fragment

Quartzite (SiO₂-dominant) or altered granitoid; uncertain from image

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite (Ferruginous)

SiO2 (Metamorphosed Sandstone)

Yellow Quartzite

Metamorphosed Quartz (SiO2)

Rounded quartz-rich pebble, likely sandstone or quartzite

Quartz sandstone (quartz arenite) or low-grade quartzite; predominantly SiO₂

Serpentine-rich altered rock

Serpentinite, likely with chlorite and magnetite; exact identification requires testing

Quartzite Cobble

Metamorphosed Quartz Sandstone (SiO2)

Weathered quartz-rich river pebble

Likely quartzite or siliceous sandstone; exact identification requires testing

Weathered sandstone or iron-stained quartzite pebble

Likely quartz-rich sandstone (mostly SiO₂), possibly weakly metamorphosed quartzite

Quartzite

Metamorphosed Sandstone (SiO2)

Dark foliated metamorphic rock, likely amphibolite

Amphibolite, typically composed mainly of hornblende and plagioclase feldspar

Dark, coarse-grained rock fragment (possibly amphibolite or gabbro)

Uncertain from the photo; likely amphibolite (hornblende-rich metamorphic rock) or a mafic igneous rock such as gabbro

Galena-bearing metamorphic rock (tentative)

Likely galena (PbS) with quartz and/or carbonate matrix; exact identification requires testing

Greenstone / serpentinite-like metamorphic rock

Probable serpentinite-rich greenschist; commonly dominated by serpentine-group minerals, chlorite, actinolite, and magnetite

Green-speckled pebble, likely epidote-bearing basalt or altered granite

Probable epidote (Ca₂(Al,Fe)₃(SiO₄)₃(OH)) in a mafic or felsic host; exact identification requires testing

River Pebble (likely Quartzite or Diorite)

Metamorphosed Quartz-rich Rock / Intermediate Igneous Rock

Quartzite Cobble

Metamorphosed Quartz Sandstone

Quartz-rich sandstone or quartzite

Quartz (SiO₂)-rich clastic rock; possibly weakly metamorphosed quartzite

Weathered greenstone (metamorphosed mafic rock)

Chlorite- and epidote-bearing metabasalt; exact identification requires examination

Quartzite

Metamorphosed Quartz Sandstone

Likely amphibolite

Amphibolite, composed mainly of hornblende and plagioclase feldspar

Likely amphibolite

Amphibolite, composed mainly of hornblende (amphibole) and plagioclase feldspar

Weathered greenish stone, possibly serpentinite or altered basalt

Tentatively serpentinite (mostly serpentine minerals) or chlorite-rich basalt; exact identification requires testing

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Biotite-rich schist (probable)

Mica schist, likely biotite–quartz–feldspar schist

Weathered greenstone

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

Quartzite River Rock (with iron staining)

Metamorphosed Sandstone (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Graphite-rich metamorphic rock (probable graphite schist)

Graphite schist; predominantly graphite (C) with quartz and mica

Eclogite

Eclogite (Omphacite-Garnet rock)

Quartzite

Metamorphosed Quartz Sandstone

Quartz-veined metamorphic rock, likely greenschist or altered metavolcanic

Chlorite–actinolite–epidote-bearing metavolcanic rock with quartz veins; exact identification requires testing

Serpentine-rich greenstone

Serpentinite, dominated by serpentine-group minerals (antigorite/lizardite/chrysotile), with possible chlorite, magnetite, and talc

Glaucophane Schist (Blueschist)

Glaucophane Schist

Quartzite (River Pebble)

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Likely greenstone (metamorphosed mafic rock)

Greenstone; commonly metamorphosed basalt or dolerite, with chlorite, actinolite, epidote, and albite

Honey Calcite Sphere

Calcium Carbonate (CaCO3)

Likely blue-green schist

Chlorite–epidote schist (tentative visual identification)

Weathered metamorphic pebble, likely greenstone

Probable greenschist or chlorite-rich metabasalt; exact identification requires testing

Rounded granitic gneiss or granitoid boulder

Biotite-bearing orthogneiss; chiefly quartz, feldspar, and biotite

Quartzite (likely Iron-stained)

SiO2 (Metamorphosed Sandstone)