Man Made

Not a rock, mineral, or geological specimen

Opalite

Synthetic glass / Opaque silicious glass

Blue crystal pendant (likely blue glass or synthetic crystal)

Not identifiable from the image; possibly synthetic quartz or glass, rather than a natural mineral

Terrazzo (Man-made Composite)

Cementitious or Resin-bound Lithic Composite

Tumbled quartz pebble

Quartz, silicon dioxide (SiO₂), likely milky quartz

Small greenish crystal/mineral fragment

Indeterminate; possibly olivine, quartz, or a green gemstone fragment

Dalmatian jasper

Porphyritic microcrystalline quartz-rich rock, commonly sold as Dalmatian jasper; spots are chiefly arfvedsonite/amphibole minerals, sometimes altered feldspar

Pyrite in Quartz (Drill Core)

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions

Vesicular basalt (probable iron-rich volcanic rock)

Basalt; chiefly plagioclase, clinopyroxene, olivine, and Fe-Ti oxides

Polished milky quartz (likely quartz worry stone or wand)

Quartz, silicon dioxide (SiO₂)

White quartz pebble

Quartz (SiO₂), likely milky quartz

Concrete / Conglomerate (Man-made)

Artificial Conglomerate (Cementitious Composite)

Sea Glass

Silicon dioxide (mostly)

Polished white calcite sphere (identification tentative)

Calcite, CaCO₃

Concrete Fragment

Artificial Conglomerate (Cement and Aggregate)

Chert (Arrowheads)

Microcrystalline Quartz (SiO2)

Opalite (Man-made Glass)

Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)

Magnetic Hematite (Man-made)

Iron Oxide (Fe2O3) with Barium-Strontium Ferrite

Black glassy fragment, likely obsidian or industrial glass

Volcanic glass (obsidian), chiefly amorphous SiO₂; identification uncertain from image

Small pebble, likely limestone

Unidentified carbonate pebble, possibly micritic limestone (calcite, CaCO₃)

Cubic Zirconia (Man-made)

Cubic Zirconia (ZrO2) with Enamel and Metal Alloy

Polished black stone, likely black obsidian

Volcanic glass; predominantly rhyolitic silica glass (SiO₂-rich)

Opalite (Man-made Glass)

Fused glass (typically made of dolomite and metal opacifiers)

Opalite (Man-made Glass)

Synthetic Opalised Glass

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)

Likely blue-green glassy slag or a weathered mineral fragment

Unidentified; the image does not show diagnostic features sufficient for a mineral identification

Red-orange cabochon, likely carnelian or glass imitation

Carnelian: chalcedony (microcrystalline SiO₂), commonly iron-colored

Bismuth

Bismuth (Bi)

Polished labradorite sphere

Labradorite, calcic plagioclase feldspar ((Ca,Na)(Al,Si)₄O₈)

Polished labradorite pendant

Labradorite, a calcium-rich plagioclase feldspar (approximately NaAlSi₃O₈–CaAl₂Si₂O₈)

Citrine Quartz

Citrine (Silicon Dioxide, SiO2)

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Hematite

Iron(III) oxide (Fe2O3)

Blue Goldstone

Man-made glass infused with copper crystals

Cobalt Blue Glass / Cullet Glass

Silicon dioxide (Amorphous man-made glass)

Sea Glass

Man-made vitreous material / Silicon dioxide

Tumbled clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Stainless Steel (Polished)

Ferrous Alloy containing Iron (Fe), Chromium (Cr), and Carbon (C)

Obsidian

Volcanic Glass

Blue Obsidian

Volcanic Glass (Amorphous)

Opalite

Synthetic Opalite Glass / Opalized Glass

Asphalt Concrete

Bituminous conglomerate