Unknown (Likely Sedimentary Or Metamorphic)

Small pale stone (unidentified)

Undetermined; image detail is insufficient for reliable identification

Water-worn pebble, likely quartz-rich sandstone or quartzite

Quartzite (tentative; a photograph cannot confirm whether the grains are fused or cemented)

Weathered river pebble, likely quartzite

Quartzite (predominantly interlocking quartz, SiO₂); identification is tentative from the photo

Clear quartz crystal

Quartz (SiO₂), likely a small hexagonal prismatic crystal

Quartz-rich stone fragment

Likely quartz (SiO₂), though the image is too dim to identify confidently

Flint (chert), likely a worked stone flake

Microcrystalline quartz (SiO₂); cryptocrystalline variety of quartz

Likely serpentinite

Serpentinite, composed mainly of serpentine-group minerals (e.g., lizardite, antigorite, or chrysotile)

Small rock fragment (unidentified)

Undetermined; the image does not show enough detail for reliable identification

Banded river pebble, likely gneiss

Foliated quartz–feldspar rock, possibly banded gneiss

Small rounded pebble, likely porous volcanic rock

Possibly vesicular basalt or scoria; exact identification is not possible from the image alone

Unidentified dark, coarse-grained rock

Possibly diorite or gabbro; identification is uncertain from the image

Tumbled green stone, likely serpentine

Serpentinite; principally serpentine-group minerals, Mg₃Si₂O₅(OH)₄

Weathered rock fragment (possibly sandstone)

Indeterminate; likely iron-stained, quartz-rich sandstone

Brecciated rock, likely polymict breccia

Polymict breccia; exact lithology cannot be determined from the image

Small dark pebble, possibly basalt or iron-rich stone

Undetermined; image alone cannot confirm composition

Small cylindrical mineral/stone fragment

Undetermined; the image is insufficient for reliable mineral identification

Polished metallic ore/mineral specimen, possibly pyrite-bearing schist

Indeterminate from image; likely pyrite (FeS₂) with quartz and/or mica in a metamorphic matrix

Dark, coarse-grained rock; likely gabbro or diorite

Undetermined mafic-to-intermediate intrusive igneous rock; exact identification requires closer examination

Small tan mineral or rock fragment (undetermined)

Unidentified; the image does not provide enough detail for a reliable identification

Iron-stained quartz-rich rock

Likely quartzite with iron-oxide staining; identification is provisional from the image

Serpentinite (likely)

Serpentine-group minerals, chiefly antigorite/lizardite; commonly with magnetite and relic olivine/pyroxene

Serpentinized ultramafic rock (likely serpentinite)

Serpentinite; chiefly antigorite/lizardite/chrysotile, commonly after peridotite (olivine–pyroxene)

Rounded ironstone concretion

Iron-rich sedimentary concretion, commonly composed of goethite and/or hematite cementing sand or clay

Greenstone (likely serpentinite or altered basalt)

Serpentinite, chiefly serpentine-group minerals; possibly chlorite- or actinolite-bearing greenschist

Likely silver-gray metallic ore fragment

Unidentified metallic mineral; possibly galena (PbS), but the image is insufficient for a confident identification

Small tan stone (undetermined)

Unidentified fine-grained geological material; species cannot be determined from the image

Bituminous coal (likely)

Coal, primarily carbon with macerals and variable mineral matter; commonly represented by approximate composition C-rich organic material

Possible green glassy mineral pebble

Undetermined; possibly green aventurine (quartz) or another green mineral

Rounded greenstone river cobble

Likely serpentinite or chlorite-rich metamorphic rock; exact identification requires testing

Likely serpentinized ultramafic rock (serpentinite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, brucite, and pyroxene

Green cabochon, likely dyed or imitation material

Undetermined; the image is insufficient to identify a mineral species

Undetermined Due to Blur (Possible Flesh-Tone Mineral)

Unknown (Insufficient Visual Clarity)

Likely botryoidal calcite or aragonite specimen

Calcite (CaCO₃), possibly aragonite (CaCO₃)

Green copper-bearing rock, possibly chrysocolla-bearing matrix

Undetermined copper-mineralized rock; green areas may include chrysocolla, malachite, or chlorite

Ironstone concretion (likely limonite/goethite-rich)

Iron-oxide/oxyhydroxide-rich concretion, chiefly goethite (FeO(OH)) and limonite; identification from the photo is provisional

Indeterminate metallic mineral fragments

Possibly pyrite, chalcopyrite, or metallic sulfide-bearing rock

Small fossil shell (possibly a brachiopod or clam)

Unidentified fossilized bivalve or brachiopod; species cannot be determined from the image

Small water-worn pebble, likely quartz-rich stone

Unidentified quartz-rich lithic pebble; precise identification is not possible from the image

Cream-colored tumbled stone, possibly calcite

Unidentified; appearance alone is insufficient to distinguish calcite from other pale minerals or stone

Tumbled banded stone, likely serpentine or chlorite-rich rock

Probable serpentinite (serpentine-group minerals: Mg₃Si₂O₅(OH)₄), possibly greenstone

Serpentinite (likely serpentinized ultramafic rock)

Serpentine-group minerals, chiefly lizardite, chrysotile, and/or antigorite; commonly derived from peridotite

Small rough mineral/rock specimen (not confidently identifiable)

Undetermined; image detail is insufficient for a reliable identification