Not A Geological Specimen

Amygdaloidal Basalt

Vesicular basalt with mineral infillings

Chert

Microcrystalline quartz (SiO2)

Flint

Silicon dioxide (SiO2)

Argillite

Argillite (compact, clay-rich sedimentary rock)

Chert / Flint

Microcrystalline quartz (SiO2)

Popcorn

Zea mays everta (P. Wilson) (Botanical name for the corn variety)

Quartzite Pebble

Quartzite (SiO2)

Likely opal-inlay cross pendant

Opal (hydrated amorphous silica, SiO₂·nH₂O); central red stone is unidentified

Fired Clay Brick (Anthropic Rock substitute)

Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)

Polished orbicular granite

Orbicular granite, commonly quartz–feldspar–biotite granite with orbicules

Gem-set gold ring

Gold alloy setting with a colorless faceted gemstone, possibly quartz or glass; the stone cannot be identified reliably from the image

Gem-set gold ring

Likely a faceted diamond (carbon, C) set in a gold-alloy ring; the surrounding stones are not identifiable from the image.

Rounded greenstone pebble

Likely serpentinite or chlorite-rich metamorphic rock; exact identification requires testing

Sandstone

Arenite (principally SiO2)

Brick veneer, likely manufactured from clay-rich shale

Fired clay brick; chiefly aluminosilicate minerals, commonly mullite and glassy silicate phases after firing

Possibly a metallic iron-rich meteorite

Undetermined iron meteorite; composition cannot be confirmed from the image

Banded agate bangle

Agate (microcrystalline quartz, SiO₂), likely gray-blue chalcedony with parallel banding

Banded agate tower (likely onyx/chalcedony)

Microcrystalline quartz, SiO₂; commonly called banded agate or black-and-white onyx

Rounded light-colored pebble, likely quartz-rich sandstone or quartzite

Unidentified quartz-rich rock; exact identification requires close examination or testing

Man-made Ceramic / Clay Figurine

Aluminosilicate Ceramic (Processed Clay)

Anthracite

Anthracite Coal

Unknown Organic Object (likely a berry or fruit)

Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.

Ruby (set in a ring; possibly synthetic or imitation)

Corundum, Al₂O₃; red color is typically caused by chromium

Polished amber-like agate or jasper carving

Likely chalcedony (microcrystalline SiO₂), possibly iron-stained carnelian/jasper; exact identification requires testing

Turquoise-colored stone bead necklace

Likely turquoise (CuAl₆(PO₄)₄(OH)₈·4H₂O), but the bead may be dyed or another blue-green stone

Red bead-and-chain costume jewelry, likely glass or plastic

No geological identification; the red beads appear manufactured and cannot be identified as mineral from the image

Chert

Microcrystalline quartz (SiO2)

Vein Quartz in Basalt or Mafic Rock

Silicon Dioxide (Quartz veins in volcanic host rock)

Colorless faceted gemstone (most likely synthetic cubic zirconia)

Cubic zirconia, ZrO₂ (likely synthetic); natural alternatives include quartz or diamond

Man-made earbud charging case (Not a rock or mineral)

Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components

Mixed river-worn landscaping stones, mostly likely quartzite and other silicate rocks

Indeterminate mixed lithologies; the pale gray pieces may be quartzite (quartz-rich rock, SiO₂)

Pearl

Pearl; primarily aragonite (CaCO₃) with conchiolin

Polished septarian nodule

Septarian concretion; calcite/aragonite and barite-filled fractures in a carbonate-rich mudstone, commonly with pyrite

Engraved polished dark stone (likely slate or basalt)

Probable fine-grained slate (microcrystalline phyllosilicates), possibly basalt; exact identification requires testing

Polished white-and-gold stone, likely marble

Calcite marble (primarily CaCO₃); exact identification requires testing

Quartz in Greenstone

Metamorphic rock with quartz vein (SiO2 / mixed silicates)

Gemstone ring (stone not identifiable)

Unknown; the small central stone may be a colorless gemstone or glass, and the surrounding metal is gold-colored alloy

Likely smoky quartz cabochon ring

Quartz, silicon dioxide (SiO₂), brown variety colored by irradiation and trace aluminum

Violet faceted gemstone, likely synthetic or simulant

Indeterminate from the image; possible violet sapphire (corundum, Al₂O₃), amethyst (quartz, SiO₂), or glass/another simulant

Tumbled greenstone (likely serpentine-rich)

Greenstone; commonly metamorphosed mafic rock composed of actinolite/chlorite with epidote and albite

Sandstone with Iron Concretion

Quartz arenite with limonite-hematite concretion

Mixed tumbled stone collection

Assorted minerals, likely including quartz, jasper, agate, and possibly obsidian or hematite