Mineral (Specifically A Gemstone Variety)

Pink Granite

Granite (Phaneritic intrusive igneous rock dominated by Quartz and K-Feldspar)

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Pink Granite

Phaneritic Felsic Igneous Rock

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Tiger's Eye

Tiger's Eye (a variety of Chalcedony, which is a microcrystalline quartz with fibrous inclusions of oxidized crocidolite)

Anthracite Coal

Anthracite

Epidote

Epidote Group (e.g., Clinozoisite, Epidote, Piemontite), Epidote formula: Ca2(Al,Fe)3(SiO4)3(OH)

Garnet (Almandine or Spessartine likely)

Garnet Group Minerals (e.g., Almandine Fe3Al2(SiO4)3, Pyrope Mg3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3)

Pyrite

Iron Sulfide (FeS2)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Ammolite

Ammolite (Biogenic Aragonite with trace elements; fossils of Placenticeras meeki and Placenticeras intercalare)

Hypersthene

Hypersthene ((Mg,Fe)SiO3)

Rutilated Quartz

Quartz (SiO2) with Rutile (TiO2) inclusions

Mineral (Variety of Quartz)

Yellow Aventurine

Silicon Dioxide (SiO2) with inclusion of Mica

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Mineral (Variety of Quartz)

Quartz

Quartz (SiO₂)

Dalmatian Stone

Dalmatian Jasper (Aplitic Perthite)

Satin Spar (Selenite)

Gypsum (CaSO4·2H2O)

Man-made glass (often grouped with minerals in lapidary)

Blue Goldstone

Aventurine Glass

Chert (Green variety)

Microcrystalline Opaline/Quartz (SiO2)

Jasper

Silicon dioxide (SiO2) with iron impurities

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Sandstone (specifically Red Sandstone)

Arenite (primarily Quartz, SiO2)

Quartz (likely a clear or rock crystal variety)

Quartz (SiO2 - Silicon Dioxide)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Pink Granite

Granite (composed primarily of Quartz, K-Feldspar, and Plagioclase)

Gneiss (specifically a granitic gneiss cobble)

Gneiss (high-grade regional metamorphic rock)

Gneiss (specifically Biotite Gneiss)

Gneiss (high-grade metamorphic rock primarily composed of Silicates)

Garnet (likely Pyrope or Almandine)

Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.