Manufactured Glass

Green Aventurine

Aventurine Quartz (SiO2) with Fuchsite inclusions

metamorphic

Chert / Flint

Chert (Microcrystalline Quartz, SiO2)

Quartz (Milky or Citrine-tinted)

Silicon Dioxide (SiO2)

Quartz Crystal with Inclusions

Silicon Dioxide (SiO2)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Muscovite (Mica) in Quartz Matrix

Muscovite (KAl2(AlSi3O10)(OH)2) and Quartz (SiO2)

Citrine

Citrine (Silicon Dioxide - SiO2)

Quartz (specifically Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

Quartz (Smoky/Grey variety)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Green Aventurine

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

Obsidian

Volcanic Glass (70-75% SiO2)

Amethyst (Rose-tinted variation)

Silicon Dioxide (SiO2) with trace iron impurities

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Chert (variations include Flint or Jasper)

Silicon Dioxide (SiO2)

Quartz (Milky/Smoky variety on matrix)

Silicon Dioxide (SiO2)

Amethyst (Chevron Amethyst/Dream Amethyst)

Silicon Dioxide (SiO2) with trace Iron impurities

Snowflake Obsidian

Volcanic glass containing Spherulite inclusions (primarily Cristobalite, SiO2)

Chert / Red Jasper

Microcrystalline Quartz (SiO2)

Quartz

Silicon Dioxide (SiO2)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Pyrite

Iron Sulfide (FeS2)

Pyrite (on host rock)

Iron Sulfide (FeS2)

Green Fluorite

Calcium Fluoride (CaF2)

Fluorite

Calcium Fluoride (CaF2)

Pyrite

Iron Disulfide (FeS2)

Basalt

Vesicular Basalt (Mafic volcanic rock)

Igneous

Muscovite Mica

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

Milky Quartz with Limonite

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Selenite (Gypsum Variety)

Hydrous Calcium Sulfate (CaSO4·2H2O)

Pyrite

Iron Disulfide (FeS2)

Basalt

Basalt (Mafic volcanic rock)

Orange Calcite

Calcium Carbonate (CaCO3)

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide)

Igneous

Milky Quartz/Clear Quartz Cluster

Silicon Dioxide (SiO2)

Muscovite Mica (Granitic Pegmatite)

Muscovite - KAl2(AlSi3O10)(OH)2

Snowflake Obsidian

Spherulitic Volcanic Glass (primarily SiO2)

Smoky Quartz (Vein Quartz)

Quartz (Silicon Dioxide, SiO2)