Sedimentary Rock (Metamorphosed)

Rounded pebble, likely quartzite or chert

Quartzite (microcrystalline quartz, SiO₂), tentative identification

Gold-bearing quartz vein rock (likely pyrite-rich quartzite)

Quartz (SiO₂) with iron sulfides, chiefly pyrite (FeS₂), possibly chalcopyrite (CuFeS₂); gold cannot be confirmed visually

Quartzite Pebble

Metamorphosed Quartz-rich Sandstone (SiO2)

Green-and-gold apatite-bearing rock, possibly epidote skarn

Apatite-group mineral, commonly fluorapatite (Ca₅(PO₄)₃F), with probable epidote and quartz; exact identification requires testing

Weathered granite or granitic gneiss

Granite; primarily quartz, feldspar, and mica

Biotite-rich granite or granitic gneiss

Quartz–feldspar–biotite granitoid; possibly foliated granite/gneiss

Quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂), possibly quartzite if metamorphically recrystallized

Quartz-rich rock fragment, possibly milky quartz or quartzite

Quartz (SiO₂); probable quartzite if recrystallized sandstone

Rounded quartz-rich pebble

Milky quartz or quartzite; predominantly silicon dioxide (SiO₂)

Weathered banded iron formation (iron-rich quartzite)

Banded iron formation (BIF), chiefly hematite/magnetite and microcrystalline quartz (SiO₂)

Zebra Jasper

Tectonized Jasper (Silicon Dioxide, SiO2)

Map Jasper (Grey Picasso Jasper)

Silicon Dioxide (SiO2) with impurities

Weathered quartz-rich rock, possibly quartzite or quartz vein fragment

Quartzite (mostly microcrystalline SiO₂), identification uncertain from image

Quartz-veined metamorphic rock, likely greenschist or altered basalt

Chlorite–actinolite schist or metabasalt with a milky quartz vein

Serpentinized ultramafic rock (serpentinite)

Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and relict olivine/pyroxene

Greenstone pebble

Likely chlorite- or epidote-bearing metamafic rock (metabasalt/greenschist)

Dark gray metamorphic rock, likely slate or phyllite

Slate/phyllite; commonly quartz–mica–chlorite aggregate

Greenstone (likely altered basalt)

Metabasalt/greenschist; chiefly chlorite, actinolite, epidote, albite, and quartz

Tumbled granite or granitic gneiss

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

Granite or granitic gneiss pebble

Quartz–feldspar–mica aggregate; possibly banded gneiss

Rounded granite or granitic gneiss cobble

Granite, chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende

Limonitic Quartzite

Metamorphosed sandstone with Limonite (FeO(OH)·nH2O) staining

Dark gray foliated metamorphic rock, likely slate or phyllite

Slate/phyllite; commonly quartz, muscovite/illite, chlorite, and graphite or carbonaceous matter

Quartz-rich breccia or iron-stained quartzite

Silica-rich rock dominated by quartz (SiO₂), with minor iron oxides and possible feldspar

Granite or granitic gneiss

Quartz–feldspar–mica aggregate; likely weathered granite, possibly foliated gneiss

Blue Quartzite (Dyed)

Metamorphosed Quartz-rich Sandstone (SiO2 with organic dye)

Likely rounded quartzite or quartz-rich cobble

Quartzite; predominantly SiO₂ (identification tentative)

Rounded green-gray stone, likely serpentinite or altered basalt

Serpentinite (antigorite/lizardite-rich), possibly serpentinized ultramafic rock

Likely weathered granite or granitic gneiss

Granite–gneiss, composed mainly of quartz, feldspar, and mica/amphibole

Vuggy quartz-rich rock, possibly quartzite or quartz geode

Microcrystalline to crystalline SiO₂ (quartz), likely quartzite with a small quartz-lined vug

Weathered quartz-rich pebble (likely milky quartz or quartzite)

Quartz, silicon dioxide (SiO₂); possibly quartzite, a metamorphic quartz rock

Weathered slate

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

Weathered quartz-rich rock, probably granite or granitic gneiss

Granite–gneiss assemblage; chiefly quartz (SiO₂), feldspars, and iron-stained mafic minerals

Weathered quartz-rich metamorphic rock

Likely quartzite or quartz-veined metamorphic rock, chiefly SiO₂ with iron-oxide staining

Dark gray rock fragment (tentative basalt or slate)

Indeterminate; possibly fine-grained basalt, or metamorphic slate

Quartz-rich rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica or feldspar impurities

Serpentinite (serpentinized ultramafic rock)

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), with possible magnetite, olivine, pyroxene, and talc

Banded Iron Formation (BIF)

Banded Iron Formation (Taconite/Itabirite)

Gemstone-inlaid bracelet, likely lapis lazuli or dyed howlite

Unconfirmed blue cabochons; lapis lazuli is a rock composed mainly of lazurite, while howlite is Ca₂B₅SiO₉(OH)₅

Slate

Foliated Metamorphic Rock (Slate)

Greenstone / serpentinized ultramafic rock

Serpentinite, chiefly serpentine-group minerals (chrysotile, lizardite, antigorite), commonly with magnetite and minor chlorite or pyroxene

Serpentinized ultramafic rock (likely serpentinite)

Serpentinite; chiefly serpentine-group minerals (lizardite, antigorite, chrysotile), with possible brucite, magnetite, and carbonate