Anthropogenic (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

Rough Diamond

Diamond (pure Carbon, C)

Sandstone

Sandstone (Quartz-rich Arenite / SiO2)

Quartzite

Metamorphosed Quartz Sandstone

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

Limestone

Calcareous sedimentary rock (CaCO3)

Pink Marble

Recrystallized Limestone (Calcium Carbonate, CaCO3)

Sandstone (likely Quartzose Sandstone)

Arenite

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 (Flint)

Silicon Dioxide (SiO2)

Chert

Microcrystalline Quartz (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 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

Small metallic-gold mineral fragment, possibly pyrite

Pyrite (FeS₂), if confirmed

Sandstone

Sedimentary Rock (Quartz Sandstone)

Multicolored beryl gemstone bracelet

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

Granite (Pegmatitic)

Phaneritic Felsic Igneous Rock

Chert (specifically White Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Green iridescent glass cabochon or synthetic gemstone

Likely synthetic glass; possibly coated synthetic quartz or lab-created green gemstone

Native silver fragment (probable)

Silver, Ag; possibly silver-bearing sulfide or plated metal

Iron-rich vesicular rock, possibly weathered scoria or ironstone

Likely oxidized basaltic scoria (Fe-oxide-bearing volcanic rock); exact identification requires testing

Pallasite Meteorite

Pallasite (Stony-Iron Meteorite)

Diamond

Carbon (C)

Dumortierite in Quartz

Dumortierite (Al6O3(BO3)(SiO4)3) with Quartz (SiO2)

Flint

Silicon dioxide (SiO2)