Man Made Glass (Often Grouped With Minerals In Lapidary)

Dzi Bead (Etched Chalcedony)

Cryptocrystalline Quartz (SiO2) with chemical etching

Green Aventurine

Quartz (SiO2) with Fuchsite inclusions

Concrete Fragment

Hardened Portland Cement Composite

Chert / Green Jasper

Silicon Dioxide (SiO2)

Polymictic conglomerate or breccia (possibly concrete-like aggregate)

Lithified polymictic gravel; clasts may include basalt, granite, quartzite, and other silicates

Botryoidal chalcedony with quartz vug

Microcrystalline quartz, SiO₂ (chalcedony), with a drusy quartz-lined cavity

Pet Rock (Man-made Quartzite or Granite Cobble)

Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica

Chert

Silicon dioxide (SiO2)

Green Agate

Silicon dioxide (SiO₂)

Titanium-coated Metal Cube (Man-made Fidget Toy)

Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)

Chert (Nodule/Pebble)

Chert (Silicon Dioxide, SiO2)

Man-made earbud charging case (Not a rock or mineral)

Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components

Green glass cabochon or tumbled stone

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

Hematite Beads

Hematite (Fe2O3)

Carnelian (red chalcedony), possibly red agate or jasper

Chalcedony, a microcrystalline variety of quartz; silicon dioxide (SiO₂), commonly colored red-orange by iron oxides. The specimen may include opaque jasper or agate zones.

Tumbled black stone, likely black obsidian

Obsidian; volcanic glass, typically rhyolitic composition (SiO₂-rich)

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

Concrete

Hydrated Portland Cement Aggregate Composite

Snowflake Obsidian

Volcanic glass with Cristobalite inclusions (70–75% SiO2)

Diorite

Diorite (Intermediate intrusive igneous rock)

Black-and-white agate geode pendant

Agate (microcrystalline quartz, SiO₂), likely a hollow geode slice with chalcedony and drusy quartz

Chert or Jasper

Microcrystalline Quartz (SiO2)

Bismuth Crystal

Bismuth (Bi)

Aura Rose Quartz

SiO2 (Silicon Dioxide with Titanium/Gold coating)

Carborundum (Silicon Carbide)

Silicon Carbide (SiC)

Blue Goldstone

Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)

Green Banded Chert (Agate/Jasper)

Silicon Dioxide (SiO2) with trace impurities of Chlorite or Glauconite

Jasper or Agate with Chlorite Inclusions

Silicon Dioxide (SiO2) with Chlorite group minerals

White quartz pebbles

Quartz (silicon dioxide, SiO₂), likely milky quartz

Man-made Synthetic Material (Costume Faux Fur)

Synthetic Polymer (Polyester/Acrylic)

Chert (Jasper/Flint variant)

Silicon Dioxide (SiO2)

Pink Cubic Zirconia (CZ)

Zirconium Dioxide (ZrO2)

Brick

Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)

Green Calcite

Calcite (CaCO3)

Obsidian

Volcanic Glass (Amorphous SiO2)

Red-orange jasper pebble (tentative)

Microcrystalline quartz, SiO₂, colored mainly by iron oxides

Chert (with Limestone matrix)

Silicon dioxide (SiO2)

Fossiliferous limestone with colonial coral

Calcite (CaCO₃) limestone containing fossil tabulate or rugose coral colonies

Feldspar

Potassium Feldspar (KAlSi3O8)

Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Feldspar

KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8

Carborundum (Silicon Carbide)

Silicon carbide (SiC)