Mineraloid (Man Made)

Fossilized Shark Tooth (Fragment)

Elasmobranchii gen. et sp. indet. (Calcium Phosphate / Apatite fossil)

Bituminous Coal (with Anthracite or Vitrinite inclusion)

Organic-rich Sedimentary Rock (Carboniferous classification)

Dark rounded pebble, likely basalt or slag

Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag

Sandstone (with iron staining)

Quartz Arenite / Ferruginous Sandstone

Sandstone

Clastic Sedimentary Rock

Sandstone

Sandstone (Quartz-rich Arenite / SiO2)

Quartzite

Metamorphosed Quartz Sandstone

Rough Diamond

Diamond (pure Carbon, C)

Likely obsidian (rough fragment)

Volcanic glass, predominantly silica-rich rhyolitic composition (SiO₂-rich, noncrystalline)

Pink Granite

Phaneritic Felsic Igneous Rock

Chert (and Jasper/Chalcedony mixture)

Microcrystalline Quartz (SiO2)

Mounted faceted gemstone ring

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

Tree Agate

Chalcedony (SiO2)

Diamond (in jewelry setting)

Carbon (C)

Pearl

Aragonite (CaCO3) with Conchiolin

Pink Marble

Recrystallized Limestone (Calcium Carbonate, CaCO3)

Limestone

Calcareous sedimentary rock (CaCO3)

Sandstone (likely Quartzose Sandstone)

Arenite

Likely iron-rich meteorite fragment

Undetermined stony-iron or iron meteorite; mineralogy may include Fe–Ni metal, troilite, and silicates

Obsidian

Volcanic glass (silica-rich rhyolitic melt; primarily SiO₂)

Unidentified gray metallic object

Not determinable from the image; likely a metal screw or manufactured fastener rather than geological material

Quartzite

Silica (SiO2) quartzite

Sandstone

Arenite

Chalk

Micrite (primarily Calcium Carbonate, CaCO3)

Pumice

Vesicular volcanic glass, typically rhyolitic to dacitic; mainly silica-rich volcanic glass with feldspar and minor quartz or pyroxene

Blue faceted gemstone ring, likely synthetic sapphire or blue topaz

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

Polished stromatolite (likely fossilized microbial mat)

Fossil stromatolite; chiefly microcrystalline quartz (SiO₂), commonly replacing carbonate

Chert

Microcrystalline Quartz (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Polished black stone sphere (likely black basalt or black tourmaline)

Most likely fine-grained basalt (plagioclase–pyroxene); mineral identification is uncertain from the image alone

Polished greenstone pebble

Likely nephrite jade (tremolite–actinolite), though serpentine or greenstone is possible from appearance alone

Carved jasper bear figurine

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

Polished purple chalcedony (likely lavender agate)

Microcrystalline quartz, SiO₂; chalcedony variety, possibly naturally iron- or manganese-colored

Polished orbicular jasper

Jasper, microcrystalline quartz (SiO₂), with iron oxides and other inclusions

Black-and-white agate geode pendant

Agate (microcrystalline quartz, SiO₂), likely a hollow geode slice with chalcedony and drusy quartz

Amber

Succinite

Amber

Succinite (fossilized tree resin)

Small metallic-gold mineral fragment, possibly pyrite

Pyrite (FeS₂), if confirmed

Gabbro

Gabbro (composed mainly of calcium-rich plagioclase feldspar and pyroxene)

Polished green serpentine

Serpentinite, chiefly antigorite/lizardite Mg₃Si₂O₅(OH)₄

Sandstone

Sedimentary Rock (Quartz Sandstone)

Multicolored beryl gemstone bracelet

Beryl, Be₃Al₂Si₆O₁₈; likely mixed aquamarine, morganite, heliodor, and green beryl beads