Uncertain

Faceted colorless gemstone, likely quartz or glass imitation

Most likely quartz (SiO₂), though the strong glare and visible facet pattern could indicate cubic zirconia or lead glass

Clear quartz crystal/chunk

Quartz (silicon dioxide, SiO₂)

Small quartz fragment

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Tumbled pegmatitic rock, likely amazonite-bearing granite

Granite/pegmatite composed mainly of quartz, feldspar, and mica; blue-green area may be microcline (amazonite)

Weathered granite or granitic rock

Granite; chiefly quartz, feldspar, and mica

Weathered granite or granitic rock

Granite; primarily quartz, feldspar, and mica

Likely weathered basalt

Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase and pyroxene, often with olivine

Mixed tumbled gemstone collection

Varied minerals, likely including amethyst, sodalite/lapis lazuli, quartzite or aventurine, jasper, and agate/chalcedony

Blue sodalite-bearing rock, likely sodalite in nepheline syenite

Sodalite (Na₈Al₆Si₆O₂₄Cl₂), possibly in nepheline syenite

Polished orbicular jasper (likely ocean jasper)

Silicified volcanic rock; chiefly microcrystalline quartz (SiO₂), with feldspar and iron-rich alteration minerals

Rough amber-like brown mineral specimen

Uncertain from photograph; possibly iron-stained quartz, common opal, or resinous amber

Tumbled blue-green stone, likely turquoise or chrysocolla

Turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O; chrysocolla: hydrated copper aluminosilicate

Serpentine (likely antigorite-rich serpentinite fragment)

Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄

Iron meteorite candidate

Fe–Ni metallic meteorite, possibly an ordinary octahedrite

Polished amethyst-bearing quartz

Quartz, SiO₂; purple coloration from irradiation and trace iron

Quartz-rich vein rock, likely milky quartz in weathered host rock

Milky quartz (SiO₂), probably with weathered feldspar and iron-oxide staining

Likely weathered sandstone or iron-rich chert fragment

Indeterminate; probable quartz-rich sandstone (SiO₂) with iron-oxide cement, possibly chert

Iron-rich chert or jasper pebble

Microcrystalline quartz (SiO₂), colored by iron oxides

Fossiliferous limestone, possibly containing a brachiopod or bivalve fossil

Calcite-rich limestone (CaCO₃), with an apparent shell impression or shell fragment

Orange chromium diopside (likely tumbled)

Diopside, CaMgSi₂O₆; orange color may reflect iron-rich composition or surface treatment/inclusion

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

Botryoidal chalcedony (likely common opal)

Silica, SiO₂; chalcedony is microcrystalline quartz, while opal is hydrated amorphous silica (SiO₂·nH₂O)

Iron-rich laterite (hematitic limonite)

Laterite composed mainly of hematite (Fe₂O₃), goethite (FeO(OH)), and hydrated iron oxides

Chrysoprase-bearing serpentine (probable)

Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄, with possible nickel-bearing chrysoprase/opal and iron oxides

Likely iron-stained quartz/chalcedony fragment

Quartz (SiO₂), possibly brecciated or partly chalcedonic, with iron-oxide staining

Likely weathered granite or granitic gneiss fragment

Granite; mainly quartz (SiO₂), feldspar, and mica/amphibole

Probable metallic meteorite fragment

Unclassified iron meteorite candidate, chiefly kamacite (α-Fe–Ni alloy)

Tumbled pale green aventurine or common green quartzite

Quartz, SiO₂, likely with fuchsite or chlorite inclusions

Tumbled green aventurine (likely)

Quartz, SiO₂, with possible fuchsite or other mica inclusions

Dark igneous rock fragment, likely basalt

Basalt; commonly composed of plagioclase, pyroxene, and minor olivine or magnetite

Weathered quartz-rich mineral nodule

Likely quartz (SiO₂) with iron-oxide staining and possibly feldspar/mica; exact identification requires testing

Serpentinized ultramafic rock (likely serpentinite)

Serpentinite; chiefly lizardite, antigorite, and/or chrysotile, commonly with magnetite, chromite, and residual olivine/pyroxene

Mixed rock and mineral collection

Mixed lithologies; likely quartz, feldspar, basalt, granite, chert, sandstone, and metamorphic rocks