Metamorphic Or Sedimentary Depending On Local Grade

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)

Sandstone (with Arkose characteristics)

Clastic sedimentary rock (SiO2 with KAlSi3O8)

Kyanite in Quartz

Kyanite (Al2SiO5) with Quartz (SiO2) matrix

Foliated slate or phyllite

Fine-grained metamorphosed mudstone; typically quartz, mica, chlorite, and clay-derived minerals

Sandstone (likely Graywacke or Siltstone variety)

Clastic Sedimentary Rock (SiO2 with assorted mineral fragments)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Mixed River Pebbles and Rock Collection

Polymictic lithic conglomerate, sandstone, and quartz pebbles

Black Jasper

Black Jasper (Silicate mineral - SiO2)

Banded gneiss

Gneiss, likely quartz–feldspar–mica gneiss

Lapis Lazuli (in Matrix)

Na8[Al6Si6O24]S2 (Lazurite as the primary component)

Yellow Quartz (Citrinated Quartz)

Silicon Dioxide (SiO2)

Quartzite (Iron-stained)

Quartzite (primarily SiO2)

Quartz-rich gneiss

Foliated quartz–feldspar–mica gneiss, possibly migmatitic

Garnet fragments

Garnet-group silicate, most likely almandine–pyrope or spessartine; composition varies, commonly (Fe,Mg,Mn)₃Al₂Si₃O₁₂

Fossilized Bone

Vertebrate Fossil Fragment (Calcium Phosphate / Hydroxyapatite)

Ferruginous Sandstone

Ferruginous Sandstone (Quartz grains with Iron Oxide cement)

Ferruginous Sandstone (with Laterite)

Ferruginous Arenite (FeO(OH)·nH2O)

Banded Gneiss

Gneiss (typically quartz, feldspar, mica, amphibole composition)

Quartzite

Quartzite (SiO2)

Gray quartz-rich stone (possibly quartzite)

Quartzite, composed primarily of quartz (SiO₂); identification is uncertain from the image

Sandstone

Arenite (primarily SiO2)

Travertine (Tufa)

Chemical Limestone (CaCO3)

Quartz-veined metamorphic cobble

Likely quartzite or quartz-rich metasedimentary rock; veins predominantly quartz (SiO₂)

Rhodonite

Manganese silicate (Mn,Fe,Mg,Ca)SiO3

Weathered metamorphic rock, likely quartz-mica schist

Quartz–mica schist; composition typically quartz + muscovite/biotite ± feldspar

Yellow Jasper

Silicon Dioxide (SiO₂)

Banded gneiss pebble

Gneiss, typically quartz–feldspar–mica assemblage

Quartzite

Quartzite (SiO2)

Fluorite (Blue)

Calcium Fluoride (CaF2)

Gneiss

High-grade metamorphic rock (Gneiss)

Mica Schist (with Muscovite mica)

Mica Schist (KAl2(AlSi3O10)(OH)2)

Banded Gneiss (River Cobble)

Gneiss (a high-grade metamorphic rock)

Weathered iron-rich rock, likely shale or slate

Probably ferruginous shale (iron-oxide-stained mudstone); exact identification requires testing

Dark green amphibolite (likely hornblende schist)

Amphibolite; chiefly hornblende amphibole and plagioclase feldspar, with possible biotite, epidote, and magnetite

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Ferruginous Sandstone

Arenite with limonite/goethite cement

Fragmented Sedimentary Pebble

Clastic Sedimentary Specimen

Glacial Erratic Boulder (Sandstone / Granite)

Glacial Erratic / Sandstone (SiO2 dominated)

Pink Quartzite

Quartzite (primarily SiO2)

Garnet-bearing metamorphic rock, likely garnet schist or amphibolite

Almandine garnet (Fe₃Al₂Si₃O₁₂) in mica- or amphibole-rich matrix

Chert (Yellow or Ochre Jasper variant)

Microcrystalline Quartz (SiO2)

Graphite-rich schist (probable graphite ore)

Graphite schist; chiefly graphitic carbon (C) with quartz, mica, and possibly feldspar