Synthetic Glass

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Flint or Chert

Microcrystalline Quartz (SiO2)

Clear Quartz (Tumbled)

Silicon Dioxide (SiO2)

Pumice

Pumice (Vesicular Felsic Igneous Rock)

Snowflake Obsidian

Volcanic glass containing Spherulite inclusions (primarily Cristobalite, SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Clear)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Pumice

Pumice

Mixed Tumbled Quartz and Chlorite Quartz

Silicon Dioxide (SiO2) with inclusions

Snowflake Obsidian

Volcanic Glass (felsic volcanic glass with cristobalite inclusions)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Milky Quartz Pebble with Matrix

Quartz (SiO2)

Quartz (Clear or Smoky)

Silicon Dioxide (SiO2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Quartz / Common Opal

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (often called Flint)

Microcrystalline quartz (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Chert (Flint)

Microcrystalline Quartz or Cryptocrystalline Silica (SiO2)

Lemon Quartz (Orizaba/Citrinated Quartz)

Silicon Dioxide (SiO2) with iron impurities/treatment

Quartz (Smoky/Grey variety)

Silicon Dioxide (SiO2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Green Aventurine

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

Snowflake Obsidian

Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)

Smoky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz with Feldspar

Silicon Dioxide (SiO2) with Potassium Feldspar (KAlSi3O8)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Drusy on Matrix

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Obsidian

Volcanic Glass (70-75% SiO2)

Quartz (specifically Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

Quartz in Matrix (possibly with Biotite or Hornblende)

Quartz (Silicon Dioxide, SiO2) in Granitic Matrix

Muscovite Mica

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

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2 + K(Al,Cr)2AlSi3O10(OH)2

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Pumice

Pumice (Volcanic glass / Felsic igneous rock)