Uncertain

Uncertain small stone; possibly weathered quartz-bearing rock

Indeterminate from image; candidate materials include quartz-rich pebble or altered silicate rock

Uncertain greenish stone, possibly serpentine or altered basalt

Serpentine-group minerals, commonly Mg₃Si₂O₅(OH)₄; identification is provisional from the photograph

Uncertain pale granitoid or weathered feldspathic rock

Likely granite or granodiorite; chiefly quartz, feldspar, and minor mica, but the photograph is insufficient for precise identification.

Uncertain coarse-grained igneous fragment

Likely granite or granitic pegmatite; quartz–feldspar–mica assemblage

Uncertain small mineral specimen, possibly fluorite or quartz-bearing rock

Indeterminate; pale green/purple material may include fluorite (CaF₂) or quartz (SiO₂)

Tumbled quartz or chalcedony (uncertain)

Quartz, SiO₂; possibly cryptocrystalline chalcedony

Uncertain dark metallic mineral specimen, possibly specular hematite or magnetite

Likely hematite (Fe₂O₃) or magnetite (Fe₃O₄); image alone is insufficient for firm identification

Uncertain light-colored stone on polished granite

Likely granite background; small specimen not confidently identifiable

Uncertain rounded gray stone

Possibly granite, gneiss, or a glacially transported granitoid

Uncertain small metallic-looking mineral/rock fragment

Indeterminate; possibly galena-bearing rock or metallic slag

Tiny metallic mineral grain (possibly native silver or a metallic sulfide)

Undetermined from the photograph; native silver (Ag) is one possibility, but identification requires examination or testing

Uncertain pale mineral/rock fragment

Indeterminate; possibly calcite-rich material or a light-colored carbonate rock

Possibly tumbled black stone (uncertain; may be black glass or obsidian)

Undetermined; possible obsidian (natural volcanic glass, predominantly SiO₂)

Uncertain dark, weathered rock fragment

Possibly basalt or a dark mafic volcanic rock; identification is limited by blur and lighting

Uncertain small tan mineral/rock fragment

Indeterminate from image; possibly feldspar-rich rock or calcite

Orbicular jasper (likely ocean jasper)

Silicified volcanic rock composed chiefly of microcrystalline quartz/chalcedony (SiO₂), with iron-oxide and other mineral inclusions

Unidentifiable embedded dark fragment

Indeterminate; possibly a dark silicate mineral or lithic inclusion

Polished black-and-white tourmaline

Schorl tourmaline, complex borosilicate; commonly black schorl with quartz or feldspar inclusions

Red grossular garnet-bearing skarn

Grossular garnet (Ca₃Al₂Si₃O₁₂), likely with epidote and quartz/calcite

Weathered volcanic rock, likely andesite or basaltic-andesite

Fine-grained plagioclase–pyroxene volcanic rock; possible altered andesite (exact identification requires testing)

Tumbled red jasper (probable)

Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides

Polished black stone, possibly basalt or black obsidian

Likely fine-grained basalt (plagioclase and pyroxene) or volcanic glass (obsidian; rhyolitic composition)

Fossil bivalve shell

Fossilized mollusk (Bivalvia), likely oyster or related species; exact genus requires locality and preparation

Polished ocean jasper

Silicified rhyolite/chalcedony aggregate (primarily microcrystalline SiO₂)

Rounded dark pebble, likely basalt

Basalt (probable; identification is uncertain from the photo)

Dark, water-worn stone (possibly basalt)

Basalt; identification is uncertain from the image alone

Dark, fine-grained rock pebble (likely basalt)

Basalt; exact identification is uncertain from the photograph

Dark, weathered igneous rock (likely basalt)

Basalt; exact identification is uncertain from the photograph

Tumbled cream-colored stone, likely calcite

Likely calcite (CaCO₃); visual identification is uncertain

Possibly citrine (yellow quartz)

Quartz, SiO₂; variety uncertain from the image

Possible yellow calcite fragment

Calcite (CaCO₃), identification uncertain from the image

Rounded, foliated metamorphic pebble (likely schist)

Mica schist, composition uncertain from the image

Likely milky quartz, possibly quartz-rich vein rock

Quartz (SiO₂); identification from the image is uncertain

Small quartz-rich stone, possibly milky quartz or quartz-bearing rock

Quartz (SiO₂), identification uncertain from image

Polished black stone, likely basalt or fine-grained mafic rock

Basalt (probable; identification uncertain from photograph)

Unidentified translucent crystal/mineral fragment

Likely quartz (SiO₂), but visual identification is uncertain

Likely raw metallic sulfide mineral, possibly galena or sphalerite

Uncertain; galena (PbS) or sphalerite (ZnS) are plausible

Likely weathered quartz or feldspar grain

Uncertain; possibly quartz (SiO₂) or a feldspar mineral

Tumbled gray stone, likely quartz-rich pebble

Uncertain; possibly microcrystalline quartz (chalcedony) or quartzite

Likely quartz-rich igneous pebble

Uncertain; possibly granite or quartz-bearing pegmatite

Likely quartz (possibly milky quartz) in a dark host rock

Quartz, SiO₂; the dark host is not identifiable from this image

Conglomerate (pebble-rich rock)

Clastic sedimentary rock composed of rounded pebble- to gravel-sized clasts cemented in a finer matrix