Antropogenic (Man Made)

Quartzite

Metamorphosed Quartz Sandstone

Chert (and Jasper/Chalcedony mixture)

Microcrystalline Quartz (SiO2)

Diamond (in jewelry setting)

Carbon (C)

Pearl

Aragonite (CaCO3) with Conchiolin

Pink Marble

Recrystallized Limestone (Calcium Carbonate, CaCO3)

Unidentified gray metallic object

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

Chert (Flint)

Silicon Dioxide (SiO2)

Blue faceted gemstone ring, likely synthetic sapphire or blue topaz

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

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

Sandstone (likely Quartzose Sandstone)

Arenite

Quartzite

Silica (SiO2) quartzite

Sandstone

Arenite

Chalk

Micrite (primarily Calcium Carbonate, CaCO3)

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 stromatolite (likely fossilized microbial mat)

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

Chert

Microcrystalline Quartz (SiO2)

Chert (flint)

Microcrystalline quartz (SiO₂), commonly called chert; brown varieties may be termed brown flint

Small metallic-gold mineral fragment, possibly pyrite

Pyrite (FeS₂), if confirmed

Native silver fragment (probable)

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

Green iridescent glass cabochon or synthetic gemstone

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

Chert (specifically White Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Multicolored beryl gemstone bracelet

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

Granite (Pegmatitic)

Phaneritic Felsic Igneous Rock

Pallasite Meteorite

Pallasite (Stony-Iron Meteorite)

Iron-rich vesicular rock, possibly weathered scoria or ironstone

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

Black-and-white agate geode pendant

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

Polished orbicular jasper

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

Sandstone

Sedimentary Rock (Quartz Sandstone)

Diamond

Carbon (C)

Pearl (with Peridot)

Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4

Likely gold-colored metal ring with a possible gemstone

Uncertain; possibly gold alloy (Au) with a small quartz or glass-like setting

Diamond

Carbon (C)

Dumortierite in Quartz

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

Flint

Silicon dioxide (SiO2)

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Quartzite

Quartzite (SiO2)

Greenstone / serpentinite carving

Serpentinite, chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile); exact identification requires testing

Chert (varieties: Flint or Jasper)

Silicon dioxide (SiO2) / Microcrystalline Quartz

Diamond (Faceted)

Carbon (C)

Raw Diamond

Carbon (C)

Diamond (in jewelry setting)

Adamantine Carbon (C)