Mineraloid (Man Made)

Basalt

Basalt

Tumbled green aventurine (probable)

Quartzite dominated by quartz (SiO₂), with green mica/fuchsite or chlorite inclusions

Diamond

Diamond (pure Carbon, C)

Basalt

Basalt (Mafic volcanic rock)

Diamond

Carbon (C)

Diamond

C (Pure Carbon)

Quartzite

Quartzite (Metamorphosed Sandstone)

Quartzite

Metamorphic Quartzite (SiO2)

Basalt

Basalt (containing plagioclase, pyroxene, and olivine)

Unidentified gray stone/concrete-like fragment

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

Asphalt aggregate (crushed stone in bitumen)

Artificial composite; predominantly crushed granite, basalt, limestone, and/or recycled aggregate bound by bitumen

Sandstone

Clastic sedimentary rock (primarily SiO2)

Diamond

Carbon (C)

Likely tumbled epidote-bearing rock or green jasper

Epidote-group silicate, possibly in a jasper or serpentinite matrix

Chert (Siltstone / Flint)

SiO2 (Cryptocrystalline Quartz)

Tumbled chalcedony or quartz pebble

Microcrystalline quartz, SiO₂ (likely chalcedony); exact identification is uncertain from the image

Turquoise-style beaded bracelet

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; possibly dyed or composite beads

Botryoidal chalcedony with iron-oxide staining

Microcrystalline quartz (SiO₂), likely iron-oxide-bearing chalcedony

Limestone

Sedimentary Rock (Primarily CaCO3)

Snowflake Obsidian

Volcanic Glass (spherulitic Obsidian) - SiO2 (with Cristobalite inclusions)

Sandstone (Pebble)

Sandstone (SiO2 with matrix/cement)

Red Quartzite

Quartzite (Metamorphic quartz sandstone)

Aragonite

Aragonite (Calcium Carbonate - CaCO3)

Diamond

Carbon (C)

Weathered chert or chalcedony nodule

Microcrystalline quartz (SiO₂), possibly silicified limestone or agate-like chalcedony

Fossilized Coral (Coquina/Limestone)

Cnidaria Anthozoa (Fossilized)

Metallic sulfide-bearing metamorphic rock

Likely graphitic schist or sulfide-rich schist, with possible pyrite/arsenopyrite and mica

Weathered sandstone boulder

Sandstone, chiefly quartz (SiO₂) with feldspar and iron-oxide cement

Quartzite

Metamorphic Quartzite (SiO2)

Sandstone

Arenite (variable SiO2 composition)

Polished green jasper cabochon (likely serpentine or nephrite imitation)

Jasper: microcrystalline quartz (SiO₂); green coloration may reflect chlorite, epidote, or iron minerals

Diamond

Carbon (C)

Diamond

Carbon (C)

Obsidian (volcanic glass), likely black obsidian

Rhyolitic volcanic glass; predominantly amorphous SiO₂

Tumbled black stone, likely black obsidian

Obsidian — natural volcanic glass, primarily SiO₂

Weathered sedimentary rock, possibly sandstone

Indeterminate clastic sediment; probable quartz-rich sandstone

Pearl

Aragonite (CaCO3 with conchiolin)

Goldstone (aventurine glass)

Synthetic copper-bearing soda-lime glass; commonly sold as red goldstone

Smoky Quartz Cluster

Smoky Quartz (Silicon Dioxide - SiO2)

Chalk

Calcium Carbonate (CaCO3)

Diamond (faceted)

Diamond (Pure Carbon, C)

Quartzite

Metamorphic quartz rock (SiO2)