Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Category
Synthetic Glass
Browse synthetic glass specimens identified by the Rock Identifier community.
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Quartz Crystal (Amethyst)
Silicon Dioxide (SiO2)
mineral
Quartzite river pebble
Quartzite (SiO2)
metamorphic
Pumice
Pumice
igneous
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Snowflake Obsidian
Spherulitic Volcanic Glass (SiO2 + impurities)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Porcelain (Stoneware Ceramic)
Mullite / Silica-glass composite (Al6Si2O13)
metamorphic (man-made)
Quartzite
Quartzite (principally SiO2)
metamorphic
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Likely tumbled amber or orange chalcedony
Uncertain from image; possibly amber (fossilized resin, chiefly C10H16O) or carnelian (microcrystalline quartz, SiO₂)
gemstone
Milky quartz-rich rock
Quartz (SiO₂), likely massive milky quartz with minor iron-stained gangue
mineral
Weathered quartz-rich pebble (probable quartzite or quartz vein fragment)
Quartzite, predominantly silicon dioxide (SiO₂); exact identification is uncertain from the photograph
metamorphic
Tumbled brown quartzite or jasper
Quartzite (mostly SiO₂), possibly iron-rich jasper (microcrystalline quartz)
metamorphic
Milky quartz (likely quartzite or massive quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Milky quartz (likely quartz-rich rock)
Quartz, silicon dioxide (SiO₂)
mineral
Veined basalt (likely basalt with quartz/calcite vein)
Basalt, aphanitic mafic volcanic rock; vein minerals likely quartz (SiO₂) or calcite (CaCO₃)
igneous
Blue Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Green Aventurine
Quartz (SiO2) with fuchsite inclusions
mineral
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Unidentified Dark Mineral or Rock
Indeterminate (Likely Silicon Dioxide or Carbon-based)
mineral
Chert (Flinty variety)
Microcrystalline Quartz (SiO2)
sedimentary
Pegmatite (with Muscovite Mica and Quartz)
Granitic Pegmatite (chiefly KAlSi3O8, SiO2, and KAl2(AlSi3O10)(OH)2)
igneous
Quartzite
Recrystallized Silicon Dioxide (SiO2)
metamorphic
Green Aventurine
Quartz with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
gemstone
Red Aventurine
Quartz containing Hematite or Goethite (SiO2)
mineral
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Green Aventurine
SiO2 (Silicon Dioxide) with Fuchsite inclusions
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
mineral
Quartzite with Quartz Veining
Metamorphosed Sandstone (primarily SiO2)
metamorphic
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Green Aventurine
Aventurine Quartz (SiO2 + Cr-bearing Mica inclusions)
metamorphic