Man Made Rock (Sedimentary Analogue)

Tumbled brown chalcedony or agate

Microcrystalline quartz (SiO₂), likely chalcedony; possibly iron-stained jasper or agate

Granite

Phaneritic Felsic Igneous Rock

Polished brown chalcedony (likely carnelian or jasper)

Microcrystalline quartz, SiO₂; iron oxides produce the brown coloration

Tumbled yellow jasper or chalcedony

Microcrystalline quartz, SiO₂; likely iron-oxide-bearing jasper/chalcedony

Tumbled aqua glassy mineral specimen, likely chrysocolla or turquoise imitation

Uncertain from image; possible chrysocolla (hydrated copper aluminosilicate, variable composition) or dyed/man-made glass

Granite

Granite (Plutonic Igneous Rock)

Slate

Slate (Foliated Metamorphic Rock)

Granite

Granite (Felsic Plutonic Rock)

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2)

Natural freshwater pearls

Pearl (nacreous calcium carbonate; chiefly aragonite, CaCO₃)

Inlaid stone ring (likely jasper or agate)

Likely microcrystalline quartz (chalcedony, SiO₂), possibly jasper, with decorative mineral inlays

Granite

Phaneritic Igneous Rock (primarily SiO2, Al2O3, K2O, Na2O)

Fossilized gastropod (likely nerite or related sea snail)

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

Blue glassy cabochon, likely blue quartz or synthetic glass

Possibly dyed blue chalcedony/quartz (SiO₂); visual identification is inconclusive

Chert (Flint)

Silicon Dioxide (SiO2)

Botryoidal chalcedony with iron-oxide staining

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

Granite

Granitoid (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8 + SiO2)

Chalcedony (Agate / Jasper Specimen)

Silicon Dioxide (SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Mother of Pearl (Nacre)

Calcium Carbonate (primarily aragonite, with conchiolin)

Limestone

Calcium Carbonate (CaCO3)

Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)

Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)

Unidentified gray metallic object

Not determinable from the image; likely a metal screw or manufactured fastener rather than geological material

Granite

Phaneritic Felsic Intrusive Igneous Rock

Diorite (River Pebble)

Intermediate Phaneritic Igneous Rock

Turquoise

Turquoise, CuAl6(PO4)4(OH)8·4H2O

Granite

Phaneritic Plutonic Felsic Rock

Fossil Sea Urchin (Echinoid)

Echinoidea fossil (often replaced by silica or calcite)

Basalt

Basalt

Sandstone

Arenite

Likely slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz

Quartz

Silicon dioxide (SiO₂)

Goldstone and pink quartz bead strands

Goldstone is aventurescent copper-bearing glass; pink beads are likely rose quartz (SiO₂), though dyed or glass imitations are possible

Goldstone (likely blue-free synthetic goldstone pendant)

Synthetic aventurine glass; silica glass with dispersed metallic copper crystals

Gypsum (Satin Spar / Alabaster variety)

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Chert (Flint)

Silicon Dioxide (SiO2)

Aura Quartz (Anomalously Coated Quartz)

Silicon Dioxide (SiO2) treated with vaporized metals

Malaysian 50 Sen Coin

Coinage (specific alloy unknown without metallurgical analysis, but typically brass or bronze for this denomination and era)

Likely clear quartz crystal (possibly cut/polished quartz or glass imitation)

Quartz, silicon dioxide (SiO₂)

Chert (varietal: Flint/Jasper)

Silicon Dioxide (SiO2)

Coquina

Bioclastic Limestone

Coquina

Bioclastic Limestone