Not A Natural Rock

Granite

Granite (a phaneritic intrusive igneous rock consisting mainly of quartz, alkali feldspar, and plagioclase)

Rough Diamond

Diamond (C)

Diamond

Native Carbon (C)

Yellow Ocher / Limonite

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)

Diamond

C (Carbon)

Diamond

Carbon (C)

Granite

Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Clear Quartz (Rock Crystal Fragments)

Silicon Dioxide (SiO2)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Concrete with Exposed Aggregate

Anthropogenic conglomerate (Concrete)

Rose Quartz

Silicon Dioxide (SiO2)

Snakeskin Agate

Agate (Cryptocrystalline Quartz, SiO2)

Coquina

Biogenic Limestone (Calcite/Aragonite base, CaCO3)

Synthetic Marbled Aggregate (Footwear Component)

Ethylene-vinyl acetate (Croslite™)

Dyed Imperial Jasper (Sea Sediment Jasper)

Silicon Dioxide (SiO2) - Impure Quartz/Chalcedony

Granite

Phaneritic high-silica plutonic rock (composed primarily of Quartz, Feldspar, and Mica)

Iron-stained Quartz

Silicon Dioxide with Iron Oxide (SiO2 with Limonite/Hematite impurities)

Coquina / Fossiliferous Limestone

Coquina (composed primarily of Calcium Carbonate / CaCO3)

Porphyry

Porphyritic Andesite/Basalt

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3/FeO(OH) cementing agents)

Tiger Iron

Tiger Iron (composite of Tiger's Eye, Red Jasper, and Hematite)

Rough Diamond

Diamond (pure Carbon, C)

Quartzite

Quartzite (primarily SiO2)

Note on Image Identification: Textile

N/A (Anthropogenic material)

Raw Citrine

Citrine (Silicon Dioxide, SiO2)

Citrine (Yellow Quartz)

Silicon Dioxide (SiO2)

Smoky Quartz

Smoky Quartz (SiO ₂)

Agate (Moss or Banded Agate variety)

Agate (Silicon Dioxide - SiO2)

Asphalt (Bituminous Concrete)

Bituminous mix containing aggregates and petroleum-based binder (CnH2n+2)

Scoria (Red Lava Rock)

Scoria (Vesicular Basalt/Andesite)

Citrine (likely Heat-Treated)

Quartz (Silicon Dioxide, SiO2)

Opalite

Synthetic Glass (SiO2 + impurities)

Native Copper with Malachite and Chrysocolla

Native Copper (Cu) with Malachite [Cu2CO3(OH)2] and Chrysocolla [(Cu,Al)2H2Si2O5(OH)4·nH2O]

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide with Iron and Titanium impurities)

Clear Quartz Sphere

Silicon Dioxide (SiO2)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Bioclastic Inclusions

Obsidian

Obsidian (volcanic glass, amorphous silica rich rock)

Turquoise

Turquoise (Hydrated phosphate of copper and aluminium) - CuAl6(PO4)4(OH)8·4H2O

Rainbow Hematite (Man-made/Treated)

Tumbled Hematite with Titanium/Anodized coating (Iron(III) oxide, Fe2O3)

Biological Bone (Patella/Knee)

Patella (part of the Human Skeletal System)

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Diamond

Diamond (pure Carbon, C)