Uncertain

Weathered mafic rock, likely basalt

Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine

Tumbled pink quartz, likely rose quartz

Rose quartz; predominantly silicon dioxide (SiO₂), commonly colored by trace iron, titanium, or manganese

Quartz vein rock, likely iron-stained quartzite or hydrothermal quartz

Mostly quartz (SiO₂), with iron oxides and minor feldspar or mica

Quartz-veined altered rock

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

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly quartz (SiO₂), with minor feldspar, mica, and iron-oxide staining

Likely labradorite-bearing rocks

Labradorite, a plagioclase feldspar (approximately NaAlSi₃O₈–CaAl₂Si₂O₈), possibly in mafic host rock

Weathered granite (likely with accessory quartz)

Granite; chiefly quartz, K-feldspar, plagioclase, and biotite/hornblende

Rough turquoise-bearing rock (probable turquoise matrix)

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O, likely in a host-rock matrix

Coarse-grained mica-bearing metamorphic rock, likely schist

Mica schist, probably muscovite–biotite schist with quartz and feldspar

Gabbro or coarse-grained dioritic rock

Plutonic mafic/intermediate rock; typically plagioclase feldspar + pyroxene ± amphibole/biotite

Likely milky quartz with a blue-gray band

Quartz (silicon dioxide, SiO₂)

Porous limestone

Calcite-rich limestone (predominantly CaCO₃)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Polished carnelian agate

Microcrystalline quartz (SiO₂), chalcedony variety; orange-red color commonly from iron oxides

Tumbled brown agate

Microcrystalline quartz (chalcedony), SiO₂; likely iron-oxide colored

Quartz pebble

Quartz, SiO₂; likely a rounded vein-quartz clast

Polished orange agate (likely carnelian)

Chalcedony, microcrystalline quartz (SiO₂); orange-red variety commonly called carnelian

Polished black stone, likely obsidian

Volcanic glass; chiefly amorphous SiO₂

Weathered flint or chert fragment

Microcrystalline quartz (SiO₂), commonly called chert or flint

Green beryl (probable emerald-like beryl) in matrix

Beryl, Be₃Al₂Si₆O₁₈; green color from chromium/vanadium (emerald when gem-quality)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Concretion or weathered iron-rich nodule

Likely an ironstone/siderite–goethite concretion; exact identification requires testing

Blue-gray tumbled stone, likely labradorite or blue-gray feldspar

Plagioclase feldspar, possibly labradorite (NaAlSi₃O₈–CaAl₂Si₂O₈)

Iron-rich volcanic rock fragment (likely basalt or weathered scoria)

Basaltic rock; primarily plagioclase feldspar, pyroxene, and iron oxides

Layered dark metamorphic rock, likely slate or phyllite

Slate/phyllite; predominantly fine-grained quartz, mica, and chlorite

Likely tumbled carnelian or orange chalcedony

Microcrystalline quartz, SiO₂ (chalcedony variety)

Likely tumbled pink-and-gray granite or gneiss

Granite: quartz, feldspar, and mica; possibly banded gneiss with similar minerals

Likely weathered quartz or quartz-rich pebble

Quartz, silicon dioxide (SiO₂)

Quartz crystal

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Weathered iron-rich rock, likely laterite or ironstone

Ferruginous laterite/ironstone, composed mainly of goethite (FeO(OH)), hematite (Fe₂O₃), and clay minerals

Likely weathered basalt or basaltic rock

Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine

Iron-rich conglomerate or breccia (tentative)

Poorly sorted lithic conglomerate/breccia, with iron-oxide staining; exact composition cannot be determined from the photo

Greenstone (likely chlorite-rich metamorphic rock)

Chlorite-bearing greenschist; exact identification requires testing

Likely slate

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

Tumbled yellow jasper or silicified rock fragment

Microcrystalline quartz (chalcedony), SiO₂, likely iron-oxide colored

Likely pink granite pebble

Granite, a coarse-grained felsic intrusive rock (typically quartz, feldspar, and mica)

Ruby (rough corundum)

Corundum, aluminum oxide (Al₂O₃), chromium-bearing variety

Granite pebble

Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica

Unidentified small green-brown mineral fragment

Indeterminate from the photograph; possibly olivine, but identification is uncertain

Likely rough quartz crystal

Quartz (SiO₂); exact variety is uncertain from the photo

Tumbled pale chalcedony pebble

Chalcedony (microcrystalline quartz, SiO₂); exact variety uncertain

Dark-colored rough stone, possibly flint or chert

Microcrystalline quartz (SiO₂); identification is uncertain from the image