Man Made (Synthetic Rock)

Tumbled brown chalcedony (likely jasper or agate)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide staining

Sandstone (likely Quartzose)

Clastic sedimentary rock (SiO2 primary)

Sandstone

Arenite (primarily SiO2)

Amber (and Cubic Zirconia)

Fossilized Tree Resin

Sandstone

Arenite (variable SiO2 composition)

Sandstone

Sedimentary Clastic Rock (Quartzose Sandstone)

Basalt

Basalt

Banded calcite (likely polished limestone/marble fragment)

Calcite, CaCO₃; probable banded calcitic marble

Sandstone (Quartz Arenite)

Sandstone (dominated by SiO2 quartz grains)

Red gemstone ring, possibly synthetic ruby or red glass

Unidentified red stone; ruby is corundum (Al₂O₃), but the image cannot confirm its identity

Sandstone

Sedimentary Rock (Quartz arenite)

Smoky Quartz

Silicon Dioxide (SiO2)

Ruby

Corundum (Al2O3) with Chromium traces

Colorless faceted gemstone, likely glass or cubic zirconia

Uncertain; possible cubic zirconia (zirconium dioxide, ZrO₂) or synthetic glass

Chert (Flint)

SiO2 (Microcrystalline Quartz)

White pebbles (rock material not identifiable from the image)

Undetermined; the smooth, pale pieces could be quartz, quartzite, or another light-colored rock

Granite Pebble

Felsic intrusive igneous rock

Smoky Quartz

Silicon Dioxide (SiO2)

Small blue cut gemstone, possibly synthetic spinel or glass; species cannot be determined from the photo

Undetermined; blue synthetic spinel (MgAl₂O₄) is one possibility

Diamond (Heart Cut)

Carbon (C)

Amethyst quartz cluster

Quartz, SiO₂; purple variety amethyst

Colorless faceted gemstone, likely cubic zirconia

Synthetic cubic zirconia (ZrO₂), tentative; possibly diamond or synthetic moissanite

Faceted purple-blue beads, likely synthetic glass or treated gemstone

Indeterminate; possible synthetic corundum, synthetic spinel, or dyed quartz (SiO₂)

Red gemstone ring; likely synthetic ruby or red glass

Undetermined from the image; ruby is corundum (Al₂O₃), while red glass is amorphous silicate

Blue gemstone ring, likely blue topaz or synthetic blue spinel

Likely topaz (Al₂SiO₄(F,OH)₂) or synthetic spinel (MgAl₂O₄); identification is uncertain from the image

Quartzite

Metamorphic Quartzite (SiO2)

Bivalve Fossil (Shell Fragment)

Class Bivalvia (Calcium Carbonate - CaCO3)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Blue Sapphire

Corundum (Al2O3)

Likely slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz

Granite

Felsic intrusive igneous rock

Black-and-white agate geode pendant

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

Chert Arrowhead

Cryptocrystalline Quartz (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Sandstone (composed predominantly of Quartz, SiO2, with Feldspar and Clay minerals)

Native Silver

Silver (elemental Ag)

Granite

Phaneritic Felsic Intrusive Igneous Rock

Diamond (or Diamond Simulant)

C (Carbon) or synthetic equivalent

Chert (often called Flint)

Chert (Microcrystalline or cryptocrystalline Silica, SiO2)

Nickel coin (U.S. currency)

Cupronickel (75% Copper, 25% Nickel alloy)

Limestone

Calcareous sedimentary rock (CaCO3)

Coquina

Bioclastic Limestone (composed primarily of CaCO3)