Man Made

Malachite

Malachite, Cu₂CO₃(OH)₂; a banded botryoidal copper carbonate specimen

Quartz Pebble (Beach Chalcedony)

Silicon Dioxide (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Chalk

Micrite (primarily Calcium Carbonate or CaCO3)

Diabase (Greenstone)

Diabase (also known as Dolerite)

Quartzite

Metamorphic Quartzite (SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Limpets Shell / Fossil Specimen

Patellogastropoda (Class)

Quartzite

Metamorphic Quartzite (primarily SiO2)

Quartzite

Metamorphic Quartzite (primarily SiO2)

Chert (specifically Tan/Gray Chert)

Microcrystalline quartz (SiO2)

Chert (varietal: Flint/Jasper)

Silicon Dioxide (SiO2)

Red-orange sunstone (likely aventurine feldspar) bead bracelet

Feldspar, commonly oligoclase or labradorite with copper inclusions; composition varies by source

Bivalve shell fossil or modern shell

Calcareous bivalve shell, composed mainly of calcium carbonate (typically aragonite and/or calcite); species cannot be determined from this view

Quartzite pebble

Quartzite (SiO2)

Brown chert (flint)

Microcrystalline quartz (SiO₂), varieties called chert or flint

Yellow faceted gemstone, likely citrine or yellow sapphire

Uncertain; probable quartz (SiO₂) or corundum (Al₂O₃)

Fossilized gastropod (likely nerite or related sea snail)

Gastropoda; shell composed originally of aragonite/calcite, commonly replaced or infilled by calcite

Yooperlite (fluorescent syenite)

Syenite containing fluorescent sodalite, chiefly Na₈(Al₆Si₆O₂₄)Cl₂

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Granite

Intrusive Igneous Rock (Granitic)

Sandstone

Arenite (with iron oxide cement)

Brick veneer, likely manufactured from clay-rich shale

Fired clay brick; chiefly aluminosilicate minerals, commonly mullite and glassy silicate phases after firing

Likely beach-worn glass and a pebble

The brown piece appears to be weathered glass (amorphous SiO₂-rich material); the pale piece is likely a small quartz-rich stone, possibly milky quartz.

Faceted clear gemstone in a gold-tone ring, likely colorless glass or cubic zirconia

Undetermined; possible cubic zirconia (ZrO₂) or glass (amorphous SiO₂)

Fossil Coral

Scleractinia (Stony Coral) fossil

Likely blue glass or synthetic gemstone jewelry

Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass

Blue tumbled glass or dyed stone (uncertain)

Unidentified; appearance is consistent with blue glass, but a blue mineral such as dyed quartz cannot be ruled out from the photo

Quartzite

Metamorphic Quartz Rock (SiO2)

Chalcedony (possibly agate)

Microcrystalline quartz, SiO₂; agate is banded chalcedony

Red jasper (likely)

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored by iron oxides

Diamond

Carbon (C)

Quartzite

Metamorphic Quartz Rock (SiO2)

Greenstone

Metabasalt / Metavolcanic rock

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

Tumbled chalcedony (likely moss or dendritic agate)

Microcrystalline quartz, SiO₂, with iron-oxide inclusions

Quartzite

Metamorphic Quartzite

Green Quartzite

Metamorphic Quartz Sandstone (SiO2)