Uncertain

White quartz in dark matrix (likely quartz-bearing breccia or polished composite specimen)

Quartz, SiO₂, in an unidentified dark silicate matrix

Iron-stained jasper (likely rough jasper)

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored by iron oxides

Tumbled magnetite (likely)

Magnetite, Fe₃O₄

Tumbled quartz (likely milky or included quartz)

Quartz, silicon dioxide (SiO₂)

Probable tumbled garnet

Garnet-group silicate, commonly almandine (Fe₃Al₂Si₃O₁₂)

Smoky quartz (likely faceted cabochon or rough fragment)

Quartz, silicon dioxide (SiO₂), smoky variety colored by irradiation-related defects

Polished dendritic agate or jasper cabochon

Microcrystalline quartz, SiO₂, likely chalcedony with iron/manganese oxide inclusions

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

Polished brown calcite (likely honey calcite)

Calcite, calcium carbonate (CaCO₃)

Mixed gemstone specimens

Likely pink sapphire or tourmaline, red garnet, blue sapphire, precious opal, and green tourmaline/emerald; exact identities cannot be confirmed from the collage

Likely iron-rich river cobble (weathered basalt or ironstone)

Indeterminate; possibly weathered basalt, with hematite/goethite staining

Vesicular basalt (likely scoria)

Basaltic volcanic rock; primarily plagioclase, clinopyroxene, olivine, and volcanic glass

Tumbled quartzite (probable)

Quartzite, predominantly crystalline SiO₂

Iron-rich flint or chert fragment

Microcrystalline quartz (SiO₂), likely ferruginous chert

Polished star-shaped gemstone, likely black obsidian

Obsidian (volcanic glass), predominantly SiO₂

Tumbled basalt pebble

Basalt, a fine-grained mafic volcanic rock

Yellow jasper or iron-stained chert

Microcrystalline quartz (SiO₂), commonly colored by goethite/limonite and other iron oxides

Aquamarine with feldspar and black tourmaline

Beryl (Be₃Al₂Si₆O₁₈), likely with feldspar and schorl (black tourmaline)

Biotite mica

Biotite, a potassium–iron–magnesium phyllosilicate mica; approximate formula K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂

Raw yellow quartz crystal, likely citrine

Quartz (SiO₂), iron-colored variety commonly sold as citrine

Botryoidal chalcedony (likely druzy quartz)

Microcrystalline quartz, SiO₂; chalcedony with a druzy quartz coating

Metallic sulfide-bearing pebble, likely pyrite in quartz or host rock

Probable pyrite (FeS₂), possibly with chalcopyrite (CuFeS₂) in a quartz-rich matrix

Polished serpentine (likely greenstone)

Serpentine-group minerals, chiefly antigorite/lizardite: Mg₃Si₂O₅(OH)₄

Tumbled golden-brown crystal, possibly citrine or quartz

Quartz (SiO₂), tentatively iron-stained or heat-treated citrine

Quartz-rich hydrothermal specimen, likely milky quartz with calcite

Quartz (SiO₂), with probable calcite (CaCO₃) and iron-oxide staining

Possible chalcopyrite-bearing sulfide fragment

Likely chalcopyrite (CuFeS₂), possibly with pyrite or bornite

Porphyritic basalt with quartz or feldspar phenocrysts

Basaltic rock; likely vesicular/porphyritic basalt, with pale mineral inclusions possibly quartz, feldspar, or calcite

Weathered granite-like rock fragments

Granite or granodiorite; chiefly quartz, feldspar, and biotite/hornblende

Blue calcite (likely)

Calcite, calcium carbonate (CaCO₃)

Iron-rich weathered rock, possibly limonite/goethite-bearing breccia

Limonite (FeO(OH)·nH₂O), goethite (α-FeO(OH)), and iron oxides; host uncertain

Blue-green copper mineral specimen, likely chrysocolla or turquoise

Probable chrysocolla, hydrated copper phyllosilicate (Cu₂H₂Si₂O₅(OH)₄·nH₂O); turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O, is an alternative

Vesicular volcanic rock, likely scoria

Scoria; predominantly basaltic composition (plagioclase, pyroxene, olivine, and volcanic glass)

Fluorescent glassy mineral specimen, possibly hyalite opal

Hyalite (hydrated amorphous silica, SiO₂·nH₂O), tentative