Synthetic Material (Not A Rock Or Mineral)

Clay (as a rock-forming material)

Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)

Sandstone

Arenite (primarily SiO2)

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Chrysocolla on Matrix

Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)

Diamond (or Diamond Simulant)

Carbon (C)

Red faceted gemstone jewelry setting

Likely synthetic ruby or red spinel centerpiece with colorless accent stones; exact identification requires gemological testing

Sandstone (with Iron Staining)

Arenite (Siliclastic sedimentary rock)

Sandstone (Quartzose)

Arenite (composed mainly of SiO2)

Sandstone

Arenite (SiO2 based)

Sandstone (Weathered)

Arenite (typically SiO2 as quartz grains)

Sandstone (Weathered Pebble)

Arenite (SiO2 primarily)

Fossil Shark Tooth

Selachii (fossilized dentition)

Fossilized Shark Tooth

Chondrichthyes (Class) fossilized tooth

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Diorite (River Cobble)

Intermediate phaneritic igneous rock

Milky quartz

Quartz (SiO₂), commonly massive or vein quartz

Sandstone

Arenite (primarily Quartz-based Sandstone)

Felsic Tuff

Pyroclastic volcanic rock (Tuff)

Amethyst Quartz

Silicon Dioxide (SiO2)

Granite

Granite (Phaneritic intrusive igneous rock)

Sandstone

Arenite (SiO2 based)

Schist

Schist (Crystalline metamorphic rock)

Quartz

Silicon Dioxide (SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Fe2O3 staining)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Amygdaloidal Basalt with Epidote

Vesicular Basalt with secondary Epidote/Quartz mineral infill

Sandstone

Quartzose Sandstone / Lithic Sandstone

Sandstone

Arenite

Sandstone

Clastic sedimentary rock (primarily SiO2)

Fossilized Coprolite

Coprolite (fossilized feces)

Travertine (Tufa)

Chemical Sedimentary Rock (CaCO3)

Weathered iron-rich rock, likely laterite or ironstone

Ferruginous laterite/ironstone, composed mainly of goethite (FeO(OH)), hematite (Fe₂O₃), and clay minerals

Orange cabochon gemstone, likely amber or amber-like resin

Natural amber: fossilized plant resin (organic mineraloid), commonly succinite; exact identification requires testing

Unidentified gray stone

Likely quartz-rich stone; exact identification is not possible from the image

Granite

Phaneritic Felsic Igneous Rock (composed of SiO2, KAlSi3O8, NaAlSi3O8)

Sandstone

Arenite

Sandstone

Arenite (SiO2 primarily)

Biotite Schist

Biotite Schist (Rich in K(Mg,Fe)3AlSi3O10(OH)2)