Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Category
Glass
Browse glass specimens identified by the Rock Identifier community.
Learn about Glass in the encyclopedia
View all →
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
Sandstone
Arenite (SiO2 primarily)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Blue Slag Glass
Anthropogenic Amorphous Silicon Dioxide
mineral
Fulgurite
Fulgurite (Lechatelierite)
metamorphic
Snowflake Obsidian
Hydrated Volcanic Glass (primarily SiO2) with Cristobalite inclusions
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Quartzite Pebble (River Rock)
Quartzite (SiO2)
metamorphic
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
metamorphic
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurity)
igneous
Yellow Quartz (or Citrine Quartz)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Crystal Quartz)
Silicon Dioxide (SiO2)
mineral
Green Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Quartz (Rose or Milky variety fragment)
Silicon Dioxide (SiO2)
mineral
Man-made Jewelry (Metal and Glass/Plastic)
Synthetic Alloy and Amorphous Solid (SiO2/Polymer)
not a rock
Black Onyx
Chalcedony (Silicon Dioxide, SiO2)
mineral
Libyan Desert Glass
Impactite (High-silica tektite)
mineral
Quartz Heart or Arrowhead Shape
Silicon Dioxide (SiO2)
mineral
Red Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Chert / Flint Nodule
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Red Jasper
Jasper (Silicate Mineral), SiO2 with Fe2O3 inclusions
sedimentary
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Pumice
Pumice (Vesicular volcanic glass)
igneous
Snowflake Obsidian
Volcanic glass containing Spherulites (SiO2)
igneous
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Obsidian
Amorphous volcanic glass (SiO2)
igneous
Mahogany Obsidian
Volcanic glass (high silica) with inclusions of Magnetite or Hematite
igneous
Obsidian
Extrusive igneous volcanic glass (rich in SiO2)
igneous
Pumice
Pumice (Vesicular volcanic glass)
igneous
Opalite (Man-made Glass)
Fused glass (typically made of dolomite and metal opacifiers)
Man-made Material / Glass
Clear Quartz (Carved Dragon)
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite
sedimentary
Sandstone Cobble
Arenite (primarily SiO2)
sedimentary
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite
sedimentary