Limestone
CaCO3 (Limestone)
sedimentary
Category
Synthetic Glass
Browse synthetic glass specimens identified by the Rock Identifier community.
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Quartzite
Quartzite (primarily SiO2)
metamorphic
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Quartzite
Silica (SiO2)
metamorphic
Tumbled Aventurine
Silicon Dioxide with inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite Pebble
Metamorphic Rock (composed mainly of SiO2)
metamorphic
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Green Aventurine
Silicon dioxide (SiO2) with inclusions of Fuchsite
mineral
Quartzite with Quartz Veins
Quartzite (chiefly SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Red Quartzite
Metamorphic Quartzite (predominantly SiO2 with iron oxide impurities)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Green Quartzite
Quartzite (primarily SiO2 with trace impurities)
metamorphic
Green Aventurine
SiO2 (Quartz with Fuchsite inclusions)
mineral
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Apache Tear
Obsidian (Natural volcanic glass)
igneous
Obsidian (in jewelry setting)
Volcanic Glass (Amorphous Silica)
igneous
Obsidian
Volcanic glass (SiO2 + impurities)
igneous
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)
igneous
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Snow)
Silicon Dioxide (SiO2)
mineral
Obsidian Arrowhead
Volcanic Glass (predominantly SiO2)
igneous
Tumbled Quartz
Silicon Dioxide (SiO2)
mineral
Red Jasper and Green Aventurine
Silicon dioxide (SiO2)
mineral
Quartz
Silicon dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
Sedimentary/Mineral
Jasper Pendant
Chalcedony (Quartz) - SiO2
Mineral/Sedimentary
Quartz River Pebble
Silicon Dioxide (SiO2)
mineral
Black Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Pumice
Pumice (Volcanic Glass Foam)
igneous
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions
igneous
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Fulgurite
Lechatelierite (Silica glass tubes)
mineral