Mineraloid (Impact Glass)

Cullet Glass (Strawberry Glass)

Amorphous Silicon Dioxide (SiO2) with metallic dopants

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various additives

Green Sea Glass

Amorphous Silica (man-made glass), SiO2 + additive metal oxides

Goldstone (Synthetic Aventurescence Glass)

Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)

Precious Coral

Corallium rubrum (Calcium carbonate with trace carotene)

Sea Glass (specifically Frosted White)

Amorphous Silica (substance: Sodium-calcium silicate glass)

Aventurine (likely Green Aventurine)

Silicon Dioxide (SiO2) with mineral inclusions

Breccia (likely volcanic or impact breccia)

Polymictic breccia; clasts in a fine-grained silicate matrix, exact mineralogy indeterminate from image

Breccia (likely quartz-cemented polymict breccia)

Clastic breccia; chiefly angular quartz/feldspar or carbonate clasts in a silica- or carbonate-rich matrix

Sand Grain (Quartz)

Silicon Dioxide (SiO2)

Potassium feldspar

Orthoclase or microcline; KAlSi₃O₈

Quartzite Pebble

Quartzite (SiO2)

Carbonado (Black Diamond)

Carbonado (Polycrystalline Diamond)

Blue topaz (likely treated)

Topaz, Al₂SiO₄(F,OH)₂

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions

Reddish-brown crystalline rock, possibly weathered granite or garnet-bearing schist

Indeterminate; likely quartz–feldspar–mica rock with iron oxides, potentially garnet-bearing

Possible iron meteorite

Iron meteorite, likely an ataxite or coarse octahedrite; composition mainly Fe–Ni alloy

Iron meteorite (probable)

Fe–Ni metal, commonly kamacite and taenite

Metallic iron meteorite fragments (probable)

Iron meteorite, chiefly kamacite (α-(Fe,Ni)) with possible taenite

Iron meteorite (likely etched or weathered iron meteorite)

Fe–Ni alloy, predominantly kamacite and taenite; possible ataxite/hexahedrite or coarse octahedrite

Breccia

Polymictic volcanic breccia (likely basaltic-andesitic matrix)

Scoria (vesicular volcanic rock)

Basaltic to andesitic scoria; chiefly plagioclase, pyroxene, and volcanic glass

Unidentified purple mineral fragment

Possibly amethyst (quartz), but the image is insufficient for confident identification

Likely metallic meteorite fragment

Undetermined; possibly an iron meteorite or stony-iron meteorite

Polished boulder opal

Precious opal, hydrated amorphous silica (SiO₂·nH₂O), likely matrix/boulder opal

Rounded gravel / river pebbles

Polymictic alluvial gravel, commonly quartz-, feldspar-, and lithic-rich clasts

Raw pink chalcedony (likely pink agate/jasper)

Microcrystalline quartz, SiO₂ (chalcedony); impurities may include iron oxides and other silicates

Weathered quartz-rich pebble

Likely granitic or feldspathic clast; chiefly quartz (SiO₂) and feldspar

Quartz (River Pebble)

Quartz (Silicon Dioxide - SiO2)

Muscovite

KAl2(AlSi3O10)(OH)2

Dark mafic rock, likely basalt

Basalt; primarily plagioclase feldspar and pyroxene, commonly with olivine and iron oxides

Moon (lunar surface depiction)

Lunar rock; chiefly anorthosite, basalt, and breccia (plagioclase-rich CaAl2Si2O8)

Mahogany Obsidian

Obsidian (SiO2 + Fe2O3)

Quartz Pebble

Silicon Dioxide (SiO2)

Tumbled green aventurine (probable)

Quartz, SiO₂, with fuchsite mica inclusions

Possible iron meteorite

Iron meteorite, likely kamacite–taenite alloy

Weathered iron-rich sandstone or ferruginous pebble

Quartz-rich sandstone with iron-oxide cement; exact identification requires testing

Fire Opal (in matrix)

Hydrated Silica (SiO2·nH2O)

Iron meteorite (probable, possibly industrial iron slag)

Fe–Ni metallic alloy, commonly kamacite and taenite

Rhodonite

Rhodonite (MnSiO3)

Precious Opal

Hydrated Silica (SiO2·nH2O)

Green fluorite crystal

Fluorite (calcium fluoride, CaF₂)