Metamorphic Or Igneous With Mineral Inclusion

Green Calcite

Calcium Carbonate (CaCO3)

Quartz (Milky/Iron-stained)

Silicon Dioxide (SiO2)

Chert (specifically Red Chert or Jasper)

Microcrystalline Quartz (SiO2)

Gold Sheen Obsidian

Volcanic Glass (SiO2 + Fe3O4 / Gas Inclusions)

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Garnet

Almandine formula: Fe3Al2(SiO4)3

Almandine Garnet

Iron aluminum silicate (Fe3Al2(SiO4)3)

Mixed Gemstone Bracelet

Mixed natural minerals and rocks (e.g., Rhodonite, Malachite, Sodalite, Rose Quartz, Black Tourmaline, Quartz/Chalcedony variants)

Quartz (likely) or a Quartzite Pebble

Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)

Sand (Construction Grade)

Unconsolidated siliciclastic sediment (primarily SiO2)

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal

Quartz Pebble (often referred to as 'Sea Glass' or 'River Stone' when worn smooth)

Silicon Dioxide (SiO2)

Quartz (Milky/Rose variety)

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz Fragment

Quartz (Silicon Dioxide, SiO2)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Quartz

Silicon dioxide (SiO2)

Corundum (Ruby Variety)

Corundum (Al2O3)

Red Garnet (Pyrope or Almandine)

Magnesium aluminum silicate (Mg3Al2(SiO4)3) or Iron aluminum silicate (Fe3Al2(SiO4)3)

Green Quartzite (Aventurine-like)

Quartzite (primarily SiO2 with trace Fuchsite mica inclusions)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Green Aventurine

Silicon Dioxide (Quartz) with inclusions of Fuchsite (K(Al,Cr)2AlSi3O10(OH)2)

Basalt

Basalt (Mafic volcanic rock)

Obsidian

Volcanic glass (high silica volcanic rock)

Mica Schist

Muscovite/Biotite Schist

Green Aventurine

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

Orthoclase Feldspar

KAlSi3O8 (Potassium aluminum silicate)

Quartzite with Chert inclusions

Metamorphosed Quartz-rich Rock (SiO2)

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Granite

Intrusive Phaneritic Felsic Igneous Rock

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.

Citrine (Heat-treated Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Citrine

Quartz (Silicon Dioxide - SiO2)

Quartz (Clear / Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Quartz (Iron-Stained Quartz Pebble)

Silicon Dioxide (SiO2)

Mahogany Obsidian

Volcanic Glass (Silicate: SiO2 + Fe2O3)

Basalt

Vesicular Basalt (Mafic volcanic rock)

Greenschist

Greenschist (composed of Chlorite, Actinolite, and Epidote)