Igneous Rock (Volcanic Glass)

Quartz (Milky/Iron-stained)

Silicon Dioxide (SiO2)

K2 Jasper (Beads)

Granodiorite with Azurite and Malachite

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Rainbow Obsidian

Volcanic glass (SiO2 - approximately 70% or more silicon dioxide)

Smoky Quartz

SiO2 (Silicon Dioxide)

Pink Granite (Alkali Feldspar Granite)

Phaneritic Felsic Igneous Rock (composed primarily of KAlSi3O8, SiO2, and NaAlSi3O8)

Bull Quartz (Milky Quartz)

Quartz (Silicon Dioxide - SiO2)

Granite

Granite (Mainly Quartz, Feldspar, and Mica/Amphibole)

Basalt with inclusion

Basalt (Aphanitic-Porphyritic texture)

Fire Opal (in Matrix)

Hydrated Silica (SiO2·nH2O)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Granite Pebble

Igneous Intrusive Rock (Quartz-Feldspar-Mica Phenocrysts)

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Quartz with Mica Schist (Pegmatite Specimen)

SiO2 (Silicon Dioxide) and Phyllosilicates (Biotite/Muscovite)

Gneiss

High-grade regional metamorphic rock (Foliated)

Granite Pebble

Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica/amphibole)

Granite

Granite (Phaneritic Quartz-Feldspar Plutonic Rock)

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Granite

Phaneritic plutonic felsic rock (primarily Quartz, Feldspar, and Mica)

Dalmation Stone (often called Dalmatian Jasper)

Peralkaline Rock (Microgranite/Aplite), SiO2 with inclusions of Arfvedsonite

Milky Quartz with Iron Inclusions

Quartz (Silicon Dioxide, SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Granite

Phaneritic Plutonic Igneous Rock (primarily composed of quartz, alkali feldspar, and plagioclase)

Pink Granite

Granite (Phaneritic igneous rock composed mainly of quartz, alkali feldspar, and plagioclase)

Quartz (Pebble)

Quartz (SiO₂)

Ocean Jasper

Spherulitic Chalcedony (SiO2)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Amethyst (Faceted Gemstone)

Silicon Dioxide (SiO2) with iron impurities

Amethyst

Amethyst (Silicon Dioxide - SiO2 with iron impurities)

Basalt with Garnet inclusions

Basalt containing Nesosilicate (Garnet Group, likely Almandine Fe3Al2Si3O12)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Garnet (likely Almandine or Pyrope)

Garnet Group (e.g., Almandine: Fe3Al2(SiO4)3; Pyrope: Mg3Al2(SiO4)3)

Ocean Jasper

Silicon Dioxide (SiO2) with various inclusions

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Quartz (Clear / Rock Crystal)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Amethyst

SiO2 (Silicon Dioxide)

Muscovite Mica

Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2

Garnetiferous Pegmatite

Pegmatite with Almandine Garnet and Muscovite

Green Glass Cullet / Recycled Glass

Amorphous Silicon Dioxide (SiO2) with various metal oxides

Quartz Crystal Cluster

Silicon Dioxide (SiO2)