Mineral Like (Natural Glass)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Smoky Quartz (Chlorite Inclusions)

Silicon Dioxide (SiO2) with trace Aluminum and Natural Irradiation

Sandstone

Arenite

Rough Sapphire

Corundum (Al2O3)

Jadeite and Mixed Gemstones (Ruby, Sapphire, Emerald)

Jadeite (NaAlSi2O6), Corundum (Al2O3), Beryl (Be3Al2(Si6O18))

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Chert (Flint)

Microcrystalline Quartz (SiO2)

Sapphire

Corundum (Al2O3)

Banded Chert / Flint

Silicon dioxide (SiO2)

Asphalt (Road Aggregate)

Bituminous Conglomerate / Asphalt Concrete

Blue Sapphire

Corundum (Al2O3)

Amethyst with Quartz Vein

SiO2 (Silicon Dioxide)

Halite (Himalayan Pink Salt)

Halite - NaCl (Sodium Chloride)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sandstone Pebble

Arenite (primarily SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Clear Quartz (Crystal Quartz)

Silicon Dioxide (SiO2)

Mystic Topaz

Aluminum Silicate Fluoride Hydroxide (Al2SiO4(F,OH)2) with metallic film coating

Corundum (Sapphire variant)

Aluminium oxide (Al2O3)

Granite (Dioritic variant)

Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

Pumice

Pumice (Amorphous volcanic glass)

Citrine (likely Heat-Treated)

Quartz (Silicon Dioxide, SiO2)

Prasiolite

Silicon Dioxide (SiO2)

Smoky Quartz (Tumbled)

Smoky Quartz (SiO2 - Silicon Dioxide)

Amethyst

Silicon Dioxide (SiO2) with trace Iron impurities

Dyed Agate (Tumbled)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Carved Mottled Greenish-Yellow Crystal/Glass Object

Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.

Clear Quartz

Silicon Dioxide (SiO2)

Citrine

Citrine (Silicon Dioxide - SiO2)

Obsidian

Volcanic glass

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

Massive Quartz (Yellow/Citrine variety)

Silicon Dioxide (SiO2)

Blue Agate (Tumbled and Dyed)

Silicon Dioxide (SiO2) with likely organic dyes

Peach Moonstone (Orange/Peach Feldspar)

Potassium aluminum silicate (KAlSi3O8)

Hag Stone

Porous sedimentary rock (typically Flint, Chert, or Sandstone) with naturally occurring holes

Clear Quartz (Rock Crystal Fragments)

Silicon Dioxide (SiO2)

Aventurine

Quartz containing inclusions of Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Diamond (in jewelry)

Cubic Carbon (C)

Quartz Pebble (Sea Glass-like Quartz)

Quartz (Silicon Dioxide - SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone

Arenite (composed primarily of SiO2)