Sedimentary Rock (Altered)

Unidentified orange-brown rock fragment

Likely weathered iron-rich volcanic rock or ochre-bearing material; exact identification is impossible from the blurred image

Dalmatian Jasper

Microgranular quartz with amphibole and tourmaline inclusions

Banded river pebble (likely greenstone)

Likely chlorite- and amphibole-rich greenstone; exact identification requires testing

Weathered quartz-rich rock, possibly quartzite or silicified sandstone

Quartz-dominant aggregate; likely microcrystalline quartz (SiO₂), but exact identification requires testing

Likely foliated metamorphic rock (schist or phyllite)

Undetermined from the image; possibly mica-rich schist or phyllite

Mica-rich schist

Muscovite–quartz schist (tentative; image alone cannot confirm mineral composition)

Turquoise

CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)

Weathered quartz-rich rock, possibly quartzite or altered granite

Quartz-dominant silicate rock; exact identification requires a fresh surface and tests

Greenstone (likely altered basalt)

Greenschist-facies metabasalt; commonly composed of chlorite, actinolite, epidote, and albite

Pebble of weathered basalt or andesite

Fine- to medium-grained mafic volcanic rock; commonly plagioclase ± pyroxene, olivine, and iron oxides

Tumbled banded gneiss or amphibolite

Banded metamorphic rock, likely quartz–feldspar–biotite gneiss with amphibole

Banded metamorphic rock, likely gneiss or metasedimentary slate

Quartz–feldspar–mica gneiss (tentative), possibly containing iron-oxide veins

Weathered rock pebble, possibly quartz-rich sandstone

Uncertain from the image; likely quartz-bearing sandstone with iron-oxide staining

Greenstone (likely chlorite- or epidote-altered basalt)

Metamorphosed mafic volcanic rock; commonly chlorite–epidote–actinolite assemblage

Greenstone (likely chlorite-rich metamorphic rock)

Chlorite-bearing greenschist; exact identification requires testing

Copper Ore / Altered Granodiorite

Cupriferous rock with silicate gangue

Pink feldspar-rich granite or pegmatite

Potassium-feldspar granite; chiefly microcline/orthoclase (KAlSi₃O₈), quartz, and minor mica

Iron-rich rock, possibly weathered basalt or ironstone

Tentatively ferruginous basalt; exact identification requires testing

Fossiliferous sandstone with plant fossils

Likely fossil-bearing siliciclastic sedimentary rock; apparent fragments may be fossil wood or leaf impressions, but species cannot be determined from the image

Dyed Agate

SiO2

Glauconitic sandstone or altered volcanic rock

Glauconite-bearing quartz-rich rock; composition likely quartz (SiO₂), glauconite, feldspar, and iron oxides

Large rounded metamorphic boulder, likely gneiss or granitic gneiss

Gneiss (likely quartz–feldspar–mica gneiss; exact identification requires closer examination)

Quartz with inclusions (likely Chlorite or Hornblende) and country rock

SiO2 (Quartz) with associated ferromagnesian minerals

Jasper and Greenstone

Microcrystalline quartz (SiO2) and altered basalt

Quartz-veined altered rock

Likely quartz-bearing metasediment or altered igneous rock; vein mineral: quartz (SiO₂)

Likely foliated metamorphic rock (slate or phyllite)

Fine-grained, foliated rock; exact identification is uncertain from the photograph

Likely garnet-bearing metamorphic rock

Possibly garnetiferous mica schist; exact identification requires close examination or testing

Quartz-bearing metamorphic rock, possibly quartzite or hornfels

Mostly quartz (SiO₂), with probable iron-oxide and dark silicate minerals

Painted Rock / Geode Specimen

Silicon Dioxide with artificial pigment coating

Dragon Blood Jasper

Epidote-bearing Quartz Microcrystalline Aggregate

Dark weathered metamorphic rock, likely schist or phyllite

Undetermined; probably mica-rich quartz–feldspar schist/phyllite

Unidentified weathered rock fragments

Likely mixed silicate rocks; specific identification requires testing

Iron-stained quartz-bearing rock, possibly weathered granite or gneiss

Quartz–feldspar rock with iron-oxide staining; exact identification requires testing

Tumbled brecciated jasper

Microcrystalline quartz (SiO₂), commonly with iron-oxide and other mineral inclusions

Likely mica-rich schist

Mica schist, probably muscovite/biotite-bearing quartz schist

Weathered iron-rich rock, likely hematite–goethite-bearing basalt or ironstone

Basalt/ironstone matrix with hematite (Fe₂O₃), goethite [FeO(OH)], and possibly limonite

Purple Dyed Dalmatian Stone

Dyed Peralkaline Trachyte

Porphyritic volcanic rock, likely porphyritic andesite

Porphyritic andesite; chiefly plagioclase and pyroxene/amphibole phenocrysts in a fine volcanic groundmass

Weathered brown rock fragment

Indeterminate; possibly iron-stained sandstone or weathered limestone

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Weathered gray metamorphic rock, likely slate or phyllite

Fine-grained foliated metamorphic rock; commonly quartz–mica–chlorite, possibly chlorite phyllite

Rounded dark pebble, possibly weathered basalt

Fine-grained mafic volcanic rock; likely basalt, but identification is uncertain from the photograph