Sedimentary Rock (Metamorphosed)

Mixed rock collection

Labeled specimens appear to include iron-rich rock, schist, basalt, serpentinite, and shale

Weathered quartz-rich rock, likely sandstone or quartzite

Quartz-dominated clastic rock; possibly quartzite (SiO₂-rich)

Red Jasper

Silicon Dioxide (SiO2) mixture

River Stone (Quartzite/Siltstone mixture)

Silicon Dioxide (SiO2) based metamorphosed sandstone

Dark metamorphic pebble, likely serpentinite or foliated amphibolite

Probable serpentinite (serpentine-group minerals) or amphibolite; exact identification requires testing

Pyrite-bearing metamorphic rock (likely pyrite schist or quartz–pyrite ore)

Pyrite (FeS₂) in a quartz–mica-rich matrix; exact host rock is uncertain from the image

Blue Apatite

Fluorapatite / Apatite group (Ca5(PO4)3(F,Cl,OH))

Picasso Jasper (Picasso Stone)

Metamorphosed Calcium Carbonate (Silicified Limestone)

Raw graphite-rich metamorphic rock (probable graphite schist)

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

Graphite-rich schist (likely graphite ore)

Graphite-bearing schist; predominantly graphitic carbon (C) with mica, quartz, and possible feldspar

Quartzite with Iron Inclusions

Metamorphosed Quartz Arenite (SiO2)

Banded calcite (likely marble or calcite-rich limestone)

Calcite, CaCO₃; possibly calcitic marble

Dark metamorphic cobble, likely slate or phyllite

Foliated metamorphic rock, probably carbonaceous slate/phyllite; exact identification requires testing

Likely quartz-rich pebbles

Quartz (SiO₂), possibly milky quartz or quartzite; identification is uncertain from the blurry image

Iron-oxide-stained sulfide-bearing rock, possibly pyrite-bearing schist

Likely quartz–mica schist or massive sulfide rock with pyrite (FeS₂) and limonite/goethite (FeO(OH)·nH₂O)

Garnet Schist

Almandine Garnet in Micaceous Schist

Weathered quartzite

Quartzite; predominantly recrystallized quartz (SiO₂)

Tumbled brown mineral pebble, possibly jasper or weathered quartzite

Indeterminate from the blurred image; likely microcrystalline quartz (SiO₂) if jasper, or quartzite dominated by quartz

Marble

Recrystallized Calcite (CaCO3)

Iron-rich sandstone or ferruginous quartzite

Quartz-rich sandstone cemented by iron oxides; possibly weakly metamorphosed quartzite

Polished fossiliferous limestone

Bioclastic limestone, commonly fossil-rich micrite or wackestone

Tumbled gray quartzite or chert pebble

Quartzite (microcrystalline SiO₂; possibly chert)

Epidote with Quartz/Feldspar

Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) with associated minerals in a host rock

Weathered quartz-rich rock, possibly chert or quartzite

Likely microcrystalline quartz (SiO₂), but exact identification is uncertain from the photograph

Weathered quartz-rich rock, possibly quartzite or iron-stained quartz

Quartzite (mostly SiO₂), with possible iron-oxide staining and minor feldspar/mica

Pyrite-bearing metamorphic rock (probable pyrite schist or sulfide ore)

Pyrite (FeS₂) in a foliated, quartz–mica-rich host rock; exact identification requires testing

Epidote–garnet schist (probable)

Epidote + garnet + quartz/feldspar mica schist; garnet may be almandine–grossular series

Likely weathered sandstone or iron-stained quartzite fragment

Quartz-rich sandstone (predominantly SiO₂; exact identification uncertain from image)

Slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz

Weathered sandstone or quartzite cobble

Quartz-rich sandstone; possibly metamorphosed to quartzite

Weathered granite or granitic gneiss

Granite; chiefly quartz, feldspar, and biotite/hornblende

Graphite-rich schist (probable graphite flake)

Graphite (C) in graphitic schist; commonly with quartz, mica, and feldspar

Tumbled granite or granitic gneiss

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

Weathered red-and-green metamorphic rock

Probable epidote-amphibolite or altered schist; exact identification requires testing

Shale (or Slate / Coal / Jet)

Laminated fine-grained sedimentary rock (predominantly clay minerals)

Banded iron formation (ironstone)

Banded iron formation, chiefly hematite/magnetite with chert (SiO₂)

Rounded river pebbles, likely quartz-rich sandstone or quartzite

Indeterminate quartz–feldspar rock; possible quartzite or arkosic sandstone

Likely quartz-rich metamorphic rock (quartzite or quartz-veined schist)

Quartzite/siliceous schist; chiefly quartz (SiO₂), with probable mica and iron-oxide staining

Weathered gray metamorphic rock, likely slate or phyllite

Foliated metapelite; composition commonly quartz, mica, and chlorite

Iron-rich quartzite or weathered ironstone

Quartzite, predominantly SiO₂, with limonite/goethite (FeO(OH)·nH₂O) staining

Iron-rich metamorphic rock (probable limonite/goethite-bearing schist)

Quartz–mica schist with iron oxyhydroxides, chiefly goethite (FeO(OH)) and limonite (amorphous hydrated iron oxides)

Greenstone / altered basalt pebble

Metamorphosed or hydrothermally altered mafic rock; likely chlorite–actinolite basalt (greenstone)