Chert (Jasper/Agate variety)
Microcrystalline quartz (SiO2)
sedimentary
Category
Synthetic (Man Made Glass)
Browse synthetic (man made glass) specimens identified by the Rock Identifier community.
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Quartzite Pebble
Quartzite (SiO2)
metamorphic
Green Aventurine Quartz
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Mica-rich Schist fragment
Mica Schist
metamorphic
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Yellow/Citrine variety)
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Obsidian
Volcanic Glass (SiO2 rich)
igneous
Libyan Desert Glass
Impactite (vitreous silica), SiO2
mineral
Fluorite (left), Sodalite (middle), Dumortierite/Tumbled Quartzite (right)
Calcium Fluoride (CaF2), Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2), Aluminum Borosilicate (Al7(BO3)(SiO4)3O3)
mineral
Leopard Skin Jasper
Silicified Rhyolite or Orbicular Jasper (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Geode fragment, likely quartz-lined basalt or chalcedony nodule
Microcrystalline quartz (SiO₂), possibly with iron-oxide staining in a basaltic host
mineral
Tumbled brown stone, likely smoky quartz or brown jasper
Probable smoky quartz (SiO₂) or iron-rich jasper (microcrystalline SiO₂); image alone is insufficient for certainty
mineral
Tumbled white quartz or quartzite pebble
Quartz (SiO₂), possibly massive quartzite
mineral
Translucent agate/chalcedony
Microcrystalline quartz (SiO₂), likely chalcedony with agate-like banding
mineral
Tumbled blue stone, likely blue aventurine or dyed quartzite
Quartz (SiO₂), likely with inclusions or artificial dye; exact identification requires testing
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Possible tektite or iron-rich slag-like natural specimen
Uncertain; possibly natural glass (tektite) or magnetite-rich rock
mineral
Pumice
Pumice
igneous
Pumice
Pumice (Glassy Volcanic Rock)
igneous
Pumice
Pumice (Volcanic Rock / Glass Froth)
igneous
Blue Cat's Eye Quartz (Heated/Dyed)
Silicon Dioxide (SiO2) with fibrous inclusions
mineral
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
Ferrous Slag
Fused calcium-iron silicates (Industrial Slag)
Anthropogenic/Industrial byproduct
Snowflake Obsidian
Obsidian with Cristobalite inclusions (SiO2)
igneous
Fulgurite
Fulgurite (Lechatelierite)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
mineral
Polished green aventurine
Quartzite or quartz-rich rock containing fuchsite mica; mainly SiO₂
mineral
Milky Quartz Pebble with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with inclusions of Dumortierite or similar minerals
mineral
Quartz-rich rock, possibly milky quartz or quartzite
Quartz (SiO₂), potentially quartzite if the grainy texture is rock-wide
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Fulgurite
Lechatelierite (vitreous silica / silica glass)
mineral