Anthropogenic (Man Made Material Processed By Nature)

Tumbled opalite (likely man-made glass)

Opalite, a trade name for opalescent glass; not natural opal

Tumbled opalite (likely synthetic glass)

Opalite; typically man-made opalescent soda-lime glass, not a recognized mineral species

Chert Arrowhead (Projectile Point)

Microcrystalline Quartz (SiO2)

Possible obsidian or slag glass

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

Strawberry Quartz

Silicon Dioxide (SiO2) with Hematite/Goethite inclusions

Milky quartz (rough quartz fragment)

Quartz, silicon dioxide (SiO₂)

Chert Concretion

Chert (Microcrystalline Quartz, SiO2)

Opalite

Synthetic Opalized Glass

Red coral beads (likely dyed or treated coral)

Corallium spp. (precious coral; calcium-carbonate skeleton, chiefly calcite)

Diamond (in a gold ring)

Diamond (pure carbon, C)

Boxwork or Septarian Concretion

Septarian nodule / Boxwork weathering

Quartz Pebble

Silicon Dioxide (SiO2)

Polished blue calcite sphere (tentative identification)

Calcite, CaCO₃; blue color generally results from trace impurities or inclusions

Clear quartz sphere

Quartz (silicon dioxide, SiO₂)

Slag (Industrial Glass)

Anthropogenic Amorphous Vitreous Silicate

Granite

Granite (Felsic Plutonic Rock)

Green Slag Glass

Amorphous Silica Glass (Anthropogenic)

Diamond

Carbon (C)

Quartz pebble in concrete

Quartz (SiO₂), embedded in Portland-cement concrete

Coquina

Coquina (Bioclastic Limestone)

Crushed Granite and Quartz Gravel

Composite Igneous and Silicate Rock Aggregate

Red Slag Glass (Cullet)

Amorphous Silicon Dioxide (SiO2) with metallic dopants

Pink Quartz / Sea Glass

Silicon Dioxide (SiO2)

Clear quartz crystal (likely)

Quartz, silicon dioxide (SiO₂)

Tumbled lavender quartz (likely lepidolite-bearing quartz or dyed quartz)

Quartz, SiO₂; possible lepidolite mica inclusions

Dyed, polished stone beads (likely assorted agate or jasper)

Microcrystalline quartz, SiO₂ (chalcedony; exact stones cannot be determined from the image)

White sea glass (naturally frosted glass fragment)

Man-made silicate glass, typically soda-lime glass; not a mineral or rock

Green sea glass or tumbled green quartz (uncertain)

Likely quartz (SiO₂) if natural; alternatively man-made soda-lime glass

Likely marble (calcite-rich metamorphic rock)

Calcite marble, composed mainly of calcite (CaCO₃); identification is provisional from the image

Citrine Quartz / Yellow Quartz Pebbles

Silicon Dioxide (SiO2)

Crushed Limestone

Calcium Carbonate (CaCO3)

Concrete aggregate surface

Human-made cementitious composite; primarily calcium-silicate-hydrate cement with mixed silicate aggregate

Clear quartz crystal (likely)

Quartz, silicon dioxide (SiO₂)

Polished dendritic agate or jasper

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

Opalite (a synthetic glass, often confused with Opal)

Silicon dioxide glass (SiO2nH2O, for natural opal)

Rock crystal quartz fragments

Quartz (silicon dioxide, SiO₂)

Dyed Howlite (simulating Lavender/Purple Jade or Charoite)

Howlite: Ca2B5SiO9(OH)5 (when natural)

Colorless faceted gemstone, likely glass or cubic zirconia

Uncertain; possible cubic zirconia (ZrO₂) or quartz (SiO₂), but the image may show a man-made simulant

Yellow cabochon gemstone, likely citrine or yellow glass imitation

Quartz (SiO₂), if natural citrine; visual evidence is insufficient to exclude man-made glass or resin

Cubic Zirconia (CZ)

Cubic Zirconium Dioxide (ZrO2)

Lava Rock (Dyed)

Basalt / Volcanic scoria

Polished gemstone tower assortment

Primarily quartz varieties and simulants; apparent amethyst (SiO₂), rose quartz (SiO₂), clear quartz (SiO₂), fluorite (CaF₂), sodalite, malachite, and possibly dyed or composite stones