Amber (and Citrine Quartz)
Succinite (Amber) and Silicon Dioxide (SiO2)
Organic Mineraloid and Mineral
Category
Man Made Glass
Browse man made glass specimens identified by the Rock Identifier community.
Learn about Man Made Glass in the encyclopedia
View all →
Red Coral (Precious Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
sedimentary
Flesh-colored Quartzite
Quartzite (SiO2)
metamorphic
Porphyritic Basalt or Diabase with Plagioclase Phenocrysts
Porphyritic Basalt or Diabase; Mineral: Plagioclase Feldspar
Igneous
Quartz Vein in Matrix
Silicon Dioxide (SiO2) within Rhyolitic or Granitic Matrix
igneous
Tumbled Amethyst
Quartz (SiO2) with trace amounts of Iron (Fe)
mineral
Slag
Ferrous slag (by-product of iron smelting)
Mineraloid / Anthropogenic
Serpentinite
Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)
Metamorphic Rock
Granite fragment
Granite
igneous
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
Mineral
Chert (or Carnelian Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (chalcedony variety) or Limestone with Quartz Veins
SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)
Mineral or Sedimentary Rock (with mineral inclusions)
Chert (and Cherty Limestone)
Silicon Dioxide (SiO2) with impurities
sedimentary
Ferruginous Quartz
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with ferric iron impurities
mineral
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Flint
Chert (a form of cryptocrystalline quartz, chemical formula SiO₂)
Mineral
Pink Granite
Phaneritic Igneous Rock (Quartz-Feldspar-Mica)
igneous
Snowflake Obsidian
Vitreous Volcanic Glass (Siliceous Obsidian with Cristobalite inclusions)
igneous
Serpentine Schist with Quartz Vein
Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).
Metamorphic
Citrine
Silicon dioxide (SiO2)
mineral
Rhinestone
Artificial Glass/Crystal
gemstone
Granite
Granite (a felsic intrusive igneous rock)
Igneous Rock
Mahogany Obsidian
Obsidian (Volcanic Glass) with Hematite/Magnetite inclusions
igneous
Rhinestone (or glass crystal)
Silicon dioxide (if glass) / Various
Mineral/gemstone imitation
Quartz Vein on Matrix
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony and Picture Jasper Beads
Blue Chalcedony (SiO2), Picture Jasper (SiO2)
Mineral
Granite
Granite (composed primarily of silica-rich minerals like quartz and feldspar)
igneous
Fluorite
Fluorite (Calcium Fluoride, CaF2)
Mineral
Slag Glass
Silicon dioxide with impurities
mineral
Snowflake Obsidian
Volcanic Glass (spherulitic Obsidian) - SiO2 (with Cristobalite inclusions)
igneous
Chalcedony (Banded/Mottled Variety)
Chalcedony (a cryptocrystalline variety of Quartz, SiO2)
Mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Granite
Plutonic felsic igneous rock
igneous
Basalt (Lava Rock) and Dyed Glass/Quartz
Scoria (Vesicular Basalt)
igneous
Banded Iron Formation
Banded Iron Formation (BIF)
Metamorphic Rock
Clear Quartz (Faceted) or Cubic Zirconia / Glass imitation
SiO2 (if Quartz), ZrO2 (if Cubic Zirconia)
mineral
Granite River Cobble
Phaneritic Felsic Igneous Rock (Granite)
igneous
Granite
Felsic Plutonic Rock
igneous
Granite
Felsic Intrusive Igneous Rock
igneous
Granite
Granite (Phaneritic Igneous Rock)
igneous
Granite Pebble
Igneous Intrusive Rock (Quartz-Feldspar-Mica Phenocrysts)
igneous