Mineraloid (Human Made Geological Specimen)

Polished white chalcedony or milky quartz pebble

Chalcedony, microcrystalline quartz (SiO₂), possibly with iron-oxide staining or a minor mineral inclusion

Carved jasper bear figurine

Jasper, microcrystalline quartz (SiO₂), likely brecciated or orbicular jasper

Granite (weathered pebble)

Granite (plutonic igneous rock)

Limonite (Iron Ore/Sandstone mixture)

Limonite (FeO(OH)·nH2O) often mixed with Goethite and sedimentary matrix

Polished agate bracelet (likely gray chalcedony)

Microcrystalline quartz, SiO₂; chalcedony/agate variety

Blue Goldstone

Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)

Tumbled yellow chalcedony (likely silicified material)

Microcrystalline quartz, SiO₂; possibly iron-stained chalcedony or fossilized/silicified limestone

Diamond-set gold ring

Diamond (carbon, C; cubic crystal structure), set in a gold alloy

Polished blue calcite sphere (tentative identification)

Calcite, CaCO₃; blue color generally results from trace impurities or inclusions

Tumbled brown jasper (probable)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide impurities

Granite countertop

Commercial granite; likely a light-colored, quartz–feldspar-rich granite or granitoid

Likely tumbled red mineral or glass imitation

Indeterminate; possibilities include red jasper (microcrystalline quartz, SiO₂) or dyed chalcedony

Blue calcite sphere

Calcite (CaCO₃), commonly blue-calcite variety

Granite

Granite (a plutonic rock)

Ring with an Orange Inlay

N/A (Man-made object)

Green glass cabochon or tumbled stone

Indeterminate; likely man-made glass, possibly aventurine glass rather than a natural mineral

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chalcedony (likely agate)

Microcrystalline quartz, SiO₂; agate is banded chalcedony

Chert (Arrowhead Shard)

Microcrystalline silica (SiO2)

Stamped concrete made to resemble flagstone

Portland-cement concrete with decorative stone-textured finish

Likely weathered metallic mineral or slag fragment

Indeterminate; possibly iron-rich sulfide/oxide material or industrial slag

Obsidian

Volcanic glass

Titanium-coated Metal Cube (Man-made Fidget Toy)

Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)

Carved Stone Turtle

Carved Soapstone and Quartz

Tumbled cream-colored mineral, likely calcite or quartz

Calcite (CaCO₃) or milky quartz (SiO₂); exact identification requires testing

Goldstone (aventurine glass)

Man-made copper-bearing glass; not a natural mineral (commonly sold as blue/brown goldstone)

Tumbled yellow-brown chalcedony (likely agate)

Microcrystalline quartz, SiO₂; chalcedony, possibly iron-stained agate

Colorless faceted gemstone, likely quartz

Quartz (SiO₂), probably rock crystal; exact identification is uncertain from the strongly backlit image

Tumbled blue chalcedony (possibly blue agate)

Microcrystalline quartz, SiO₂; chalcedony variety

Inlaid stone ring (likely jasper or agate)

Likely microcrystalline quartz (chalcedony, SiO₂), possibly jasper, with decorative mineral inlays

Asphalt (Road Aggregate)

Asphalt concrete / Bituminous mixture

Mica (likely biotite-rich mica aggregate)

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

Mounted faceted gemstone ring

Likely diamond (carbon, C), though the image is insufficient for definitive identification

Inscribed limestone fragment

Calcitic limestone (primarily CaCO₃), possibly marble if recrystallized

Blue faceted gemstone ring, likely synthetic sapphire or blue topaz

Uncertain from image; possible corundum (Al₂O₃) or topaz (Al₂SiO₄(F,OH)₂)

Polished septarian nodule

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

Concrete Rubble with Aggregate

Hardened Portland Cement Paste with Coarse Aggregate

Green aventurine cabochon

Quartzite dominated by quartz (SiO₂), colored green by fuchsite mica or chlorite

Mixed rock and mineral collection

Multiple specimens; visible pieces may include quartz, calcite, agate/chalcedony, jasper, and dyed or coated materials

Note: Item is not a geological specimen

Guitar Components (Steel, Nickel, Plastic, Wood)

Small pebble, likely limestone

Unidentified carbonate pebble, possibly micritic limestone (calcite, CaCO₃)

Fulgarite

Fulgurite (Lechatelierite / Vitrified Sand)