Man Made Composite

Rough Diamond

Diamond (pure Carbon, C)

Unidentified gray metallic object

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

Sandstone

Sandstone (Quartz-rich Arenite / SiO2)

Quartzite

Metamorphosed Quartz Sandstone

Chert (Flint)

Silicon Dioxide (SiO2)

Limestone

Calcite-rich limestone (primarily CaCO₃)

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

Diamond (in jewelry setting)

Carbon (C)

Pearl

Aragonite (CaCO3) with Conchiolin

Chert (and Jasper/Chalcedony mixture)

Microcrystalline Quartz (SiO2)

Pink Marble

Recrystallized Limestone (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

Small metallic-gold mineral fragment, possibly pyrite

Pyrite (FeS₂), if confirmed

Diamond-set gold ring or ring component

Diamond (crystalline carbon, C); gold alloy setting (Au)

Diamond ring

Diamond, crystalline carbon (C), set in a gold-colored metal ring

Quartzite

Silica (SiO2) quartzite

Sandstone

Arenite

Sandstone (likely Quartzose Sandstone)

Arenite

Polished stromatolite (likely fossilized microbial mat)

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

Native silver fragment (probable)

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

Diamond (in jewelry setting)

Diamond (C - Carbon)

Green iridescent glass cabochon or synthetic gemstone

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

Chert (flint)

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

Polished green stone bead, likely dyed howlite or magnesite

Possibly dyed Ca₂B₅SiO₉(OH)₅ (howlite) or MgCO₃ (magnesite); identification is uncertain from the photo

Chert

Microcrystalline Quartz (SiO2)

Chert (specifically White Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Black-and-white agate geode pendant

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

Pallasite Meteorite

Pallasite (Stony-Iron Meteorite)

Multicolored beryl gemstone bracelet

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

Granite (Pegmatitic)

Phaneritic Felsic Igneous Rock

Red sandstone

Quartz-rich sandstone, commonly composed of quartz grains cemented by iron oxides

Iron-rich vesicular rock, possibly weathered scoria or ironstone

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

Polished orbicular jasper

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

Polished turquoise matrix beads

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O, with host-rock matrix; exact identification is uncertain from the image

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

Turquoise ring (likely stabilized or imitation turquoise)

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; exact material is uncertain from the image

Greenstone / serpentinite carving

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

Limestone

Sedimentary Calcium Carbonate (CaCO3)