Man Made Glass (Not A Natural Rock Or Mineral)

Opalite (likely man-made opalescent glass)

Opalite; not a true mineral, typically synthetic opalescent glass (silica-based)

Polished milky quartz (likely quartz worry stone or wand)

Quartz, silicon dioxide (SiO₂)

White quartz pebble

Quartz (SiO₂), likely milky quartz

Green glass cabochon or tumbled stone

Indeterminate; likely man-made glass, possibly aventurine glass rather than a natural mineral

Opalite

Synthetic Opalized Glass

Goldstone

Aventurine glass

Tumbled Clear Quartz/Rock Crystal

Silicon Dioxide (SiO2)

Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)

Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)

Sandstone (with Liesegang rings or joints)

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)

Pink Quartz / Sea Glass

Silicon Dioxide (SiO2)

Concrete Fragment

Hardened Portland Cement Composite

Clear Quartz Sphere (Rock Crystal)

Silicon Dioxide (SiO2)

Painted River Rock

Artificially Coated Sedimentary Rock

Aura Quartz (Titanium-coated Quartz)

Silicon Dioxide (SiO2) with metallic vapor coating

Opalite

Synthetic Opalised Glass

Granite with Cupules / Bedrock Mortars

Granite (felsic intrusive plutonic rock)

Slag

Metallurgical Slag

Tumbled quartz pebble

Quartz, silicon dioxide (SiO₂), likely milky quartz

Concrete / Anthropogenic Conglomerate

Man-made composite material (Portland cement, aggregate, and water)

Synthetic Resin Charm (Seal Shape)

Polymer Resin with plastic glitter / Polyethylene terephthalate glitters

Aura Quartz (Titanium Quartz)

Titanium-coated Silicon Dioxide (SiO2 + Ti)

Goldstone

Avventurina (Man-made Glass with Copper inclusions)

Titanium Aura Quartz

Titanium bonded Silicon Dioxide (SiO2 + Ti)

Diamond (or Simulant)

Carbon (C)

Quartz (likely milky quartz or quartz glass-like fragment)

Quartz, silicon dioxide (SiO₂)

Goldstone (Red)

Aventurine Glass (Cupriferous glass)

Green glass-like mineral specimen, likely fluorite

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

Concrete

Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)

Blue Slag Glass

Man-made Silicon Dioxide (Amorphous)

Concrete fragment with Aggregate

Anthropogenic Concrete with Calcarious and Siliceous Aggregate

Opalite

Synthetic Glass (Amorphized Silicon Dioxide)

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Strawberry Quartz

Silicon Dioxide (SiO2) with Hematite or Goethite inclusions

Baked-clay ceramic fragment (likely brick or pottery)

Fired clay, primarily aluminosilicate minerals; not a natural rock

Opalite-style pendant (likely synthetic glass, not natural opal)

Opalescent glass; commonly sold as “opalite” (not a recognized mineral species)

Likely clear quartz pebble or glassy quartz fragment

Quartz (silicon dioxide, SiO₂)

Opalite

Man-made opalescent glass (SiO2 + metal oxides)

Quartzite (Engineered Stone)

Silicon Dioxide (SiO2) based synthetic composite

Goldstone (blue/black aventurine glass)

Man-made aventurine glass; silica glass containing metallic copper or other glittering inclusions

Opalite (Synthetic Moonstone/Sea Opal)

Silicon Dioxide (SiO2) glass with metallic inclusions

Opalite

Man-made Glass (Synthetic Opalized Glass)

Black glassy fragment, likely obsidian or industrial glass

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