Man Made Rock Like Material

Chert (Flint)

Silicon Dioxide (SiO2)

Possible obsidian or slag glass

Volcanic glass, primarily SiO₂; alternatively industrial iron-rich glassy slag

Mystic Topaz

Aluminum Silicate Fluoride Hydroxide (Al2SiO4(F,OH)2) with metallic film coating

Tumbled opalite (likely man-made glass)

Opalite glass; a synthetic opalescent glass, not a natural mineral species

Cubic Zirconia (Man-made)

Cubic Zirconia (ZrO2) with Enamel and Metal Alloy

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass

Quartzite (Engineered Stone)

Silicon Dioxide (SiO2) based synthetic composite

Rock crystal quartz fragments

Quartz (silicon dioxide, SiO₂)

Blue glass-like bead or gemstone keychain ornament

Indeterminate; likely cobalt-blue glass or synthetic blue spinel, not identifiable as a natural mineral from the image

Sandstone

Arenite

Green glass-like mineral specimen, likely fluorite

Fluorite (calcium fluoride, CaF₂), if natural; appearance may also indicate colored glass

Opalite (Man-made Glass)

Synthetic Opalised Glass

Slag

Anthropogenic glassy silicate

Tumbled milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Black glassy fragment, likely obsidian or industrial glass

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

Chert Nodule

Microcrystalline Quartz (SiO2)

Polished dendritic agate or jasper

Microcrystalline quartz (SiO₂), likely chalcedony with iron/manganese dendrites

Sea Glass

Man-made silicate glass (Amorphous silicon dioxide)

Faceted clear gemstone, likely quartz or glass imitation

Most likely quartz (SiO₂); exact identification requires refractive-index and hardness tests

Opalite

Man-made opalescent glass (SiO2 + metal oxides)

Rounded graywacke or sandstone cobble

Lithified clastic sandstone; likely quartz–feldspar–lithic grain aggregate in a silica or calcite matrix

Blue Glass or Slag Glass

Amorphous Silica (Anthropogenic Glass)

Man-made Jewelry (Metal and Glass/Plastic)

Synthetic Alloy and Amorphous Solid (SiO2/Polymer)

Opalite

Synthetic Fluorescent Glass (SiO2 + impurities)

Vesicular basalt (probable iron-rich volcanic rock)

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

Diamond

Carbon (C)

Ferrochrome Slag

Anthropogenic slag (Fe-Cr alloy waste)

Opalite

Synthetic Opalite (Man-made glass)

Green Sea Glass

Man-made silicate glass (weathered)

Diamond (or Cubic Zirconia)

Carbon (C) or Zirconium Dioxide (ZrO2)

Strawberry Quartz

Silicon Dioxide (SiO2) with Hematite/Goethite inclusions

Sandstone

Arenite (with iron oxide cement)

Fossilized Coral (Coquina/Limestone)

Cnidaria Anthozoa (Fossilized)

Dyed Crackle Quartz (Green)

Quenching-treated Quartz (Silicon Dioxide, SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Polished black pebble, possibly obsidian

Volcanic glass (obsidian), likely; identification is tentative from the image

Terrazzo (with Marble and Granite fragments)

Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates

Sandstone

Sedimentary Rock (Quartz Sandstone)

Carved Stone Turtle

Carved Soapstone and Quartz

Chert (and Agate/Chalcedony)

Microcrystalline Quartz (SiO2)

Unidentified gray stone/concrete-like fragment

Indeterminate; likely a fine-grained carbonate or cementitious geological fragment

Blue Cracked Quartz (Dyed Fire Crackle Quartz)

Silicon Dioxide (SiO2) with synthetic dye