Quartz Pebble (Milky and Gray)
Quartz (Silicon Dioxide, SiO2)
mineral
Category
Synthetic Glass
Browse synthetic glass specimens identified by the Rock Identifier community.
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Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Snowflake Obsidian
Volcanic Glass with Cristobalite inclusions
igneous
Black Obsidian
Obsidian / Amorphous volcanic glass (SiO2)
igneous
Chert (Flint)
Chert (Cryptocrystalline Silicon Dioxide, SiO2)
sedimentary
Quartzite or Quartz Vein Material
SiO2
metamorphic
Fulgurite
Fulgurite (Lechatelierite)
metamorphic
Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Quartz (Gray or Smoky variety)
Silicon Dioxide (SiO2)
mineral
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurity)
igneous
Green Sea Glass
Man-made silicate glass (weathered)
sedimentary
Clear Quartz (Crystal Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper variety)
Silicon dioxide (SiO2)
sedimentary
Clear Quartz Sphere
Silicon Dioxide (SiO2)
mineral
Chert (Red Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically Jasper or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Blue Slag Glass
Anthropogenic Amorphous Silicon Dioxide
mineral
Rose Quartz
Silicon Dioxide with trace inclusions (SiO2)
mineral
Likely quartz cluster with iron staining
Quartz (SiO₂), possibly with calcite or feldspar inclusions
mineral
Milk Quartz (Sea Glass appearance)
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Metasedimentary or Igneous Matrix
metamorphic
Libyan Desert Glass
Impactite (High-silica tektite)
mineral
Snowflake Obsidian
Spherulitic Obsidian (contains Cristobalite inclusions)
igneous
Quartz Heart or Arrowhead Shape
Silicon Dioxide (SiO2)
mineral
Slag (Anthropogenic Glass/Iron byproduct)
Ferro-silicate Slag
Anthropogenic (Man-made)
Quartzite Pebble
Metamorphic Rock (mainly Silicon Dioxide, SiO2)
metamorphic
Muscovite Mica
Muscovite (Potassium Aluminum Silicate Hydroxide), KAl2(AlSi3O10)(OH)2
mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
metamorphic
Snowflake Obsidian
Volcanic glass with Phenocrysts (SiO2)
igneous
Yellow Quartz (or Citrine Quartz)
Silicon Dioxide (SiO2)
mineral
Agate Slices and Clear Quartz Points
Agate (SiO2 Chalcedony) and Clear Quartz (SiO2 Crystalline)
mineral
Chalcedony (Grey/White Agate)
Silicon Dioxide (SiO₂)
mineral
Goldstone (blue-goldstone–style glass) beads
Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral
mineral
Green Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Quartz (Rose or Milky variety fragment)
Silicon Dioxide (SiO2)
mineral
Mahogany Obsidian
Volcanic glass (high silica) with inclusions of Magnetite or Hematite
igneous
Obsidian
Extrusive igneous volcanic glass (rich in SiO2)
igneous
Quartzite Pebble (River Rock)
Quartzite (SiO2)
metamorphic
Basalt
Basalt (Aphanitic Igneous Rock)
igneous
Quartzite
Quartzite
metamorphic