Organic (If Resin) Or Synthetic (If Glass); Simulating Sedimentary Or Metamorphic (For Natural Stones)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) with impurities

Almandine Garnet in Schist Matrix

Almandine - Fe3Al2(SiO4)3

Anthracite Coal

Anthracite

Bamboo Leaf Jasper

Silicified Siltstone or Jasper (SiO2)

Chert (Hagstone/Adder Stone)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Tahitian Pearl

Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3

River Pebble (Likely Quartzite or Chert)

Quartzite (primarily SiO2)

Quartz (Milky Quartz Pebble)

Silicon Dioxide (SiO2)

Red Jasper (possibly)

Jasper (a variety of Chalcedony, SiO2)

Black Diamond / Black Sapphire

Carbon (C) or Corundum (Al2O3)

Tiger's Eye (dark/grey variant)

Pseudomorph of Quartz after Crocidolite (SiO2)

Graphite

Graphite (Native Carbon), Formula: C

Metamorphic

Shale (with minor calcite veining)

Clastic sedimentary rock (primarily clay minerals and quartz)

Moonstone

Orthoclase Feldspar (specifically showing adularescence)

Blue Tiger's Eye

Riebeckite (crocidolite variety)

Blue Quartzite (Dyed)

Silicon Dioxide (SiO2) with inclusions

Graphite

Graphite (Carbon, C)

sedimentary (secondary mineral) within igneous

Jasper in Basalt Matrix

Silicon Dioxide (SiO2) with impurities; Chalcedony

Pyrite in Shale

Iron Disulfide (FeS2) in Sedimentary Shale

Quartzite

Quartzite (SiO2)

Magnetite

Iron(II,III) oxide (Fe3O4)

Magnetite / Iron Ore

Magnetite (Fe3O4)

Ruby

Corundum (mineral species), variety: Ruby (Al2O3 with Cr3+ as the chromophore)

Coal (Bituminous or Anthracite)

Carbonaceous sedimentary rock (primarily Carbon, C)

White Moonstone (Scolicite or White Feldspar var. )

Lattice-structure Silicate (KAlSi3O8)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Fossiliferous Limestone (Coral Fossil)

Scleractinian Coral in Calcium Carbonate (CaCO3)

Zircon

Zircon (ZrSiO4)

Moonstone (Tumbled)

Orthoclase Feldspar (KAlSi3O8) with inclusions of Albite

Garnet (likely Almandine or a blend)

Garnet group: X3Y2(SiO4)3, where X can be Ca, Mg, Fe2+, Mn2+ and Y can be Al, Fe3+, Cr3+. Given the dark, somewhat reddish-brown appearance in the image, it's likely Almandine (Fe3Al2(SiO4)3) or a mix with other iron-rich garnets.

Banded Agate (River Stone)

Agate (Silicon Dioxide - SiO2)

Almandine Garnet

Almandite (Fe3Al2(SiO4)3)

Pumice

Pumicite (fine-grained pumice), Scoria (similar origin but denser and darker, usually basaltic)

Igneous

Shale

Fissile mudrock (composed primarily of clay minerals and quartz)

Fossil Crab

Decapoda (likely Avitelmessus or Raninidae family)

Chert (variant of Flint)

Chert (SiO2)

Sedimentary

Agate (specifically, multi-colored or pastel-dyed agate)

Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).