Pegmatite (Quartz with Tourmaline/Biotite inclusions)
Igneous Pegmatite
igneous
Category
Crystal
Browse crystal specimens identified by the Rock Identifier community.
Pegmatite
Granitic Pegmatite
igneous
Quartz Geode with Agate
Silicon Dioxide (SiO2)
mineral
Amethyst crystal (likely quartz)
Quartz, crystalline silica (SiO₂), purple variety amethyst
gemstone
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz (Clear / Rock Crystal)
Silicon Dioxide (SiO2)
Mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
mineral
Red glass-like crystal, likely synthetic ruby or red glass
Uncertain from image; possible corundum (ruby), Al₂O₃, or synthetic glass
gemstone
Amethyst (purple quartz)
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Amethyst/Smoky Quartz Cluster
Silicon Dioxide (SiO2) with iron and aluminum impurities
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Amethyst (Geode Fragment)
Silicon Dioxide (SiO2 with iron impurities)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Clear Quartz / Rock Crystal
Silicon Dioxide (SiO2)
mineral
Likely quartz crystal fragment
Quartz (silicon dioxide, SiO₂)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Volcanic glass (SiO2) with Cristobalite (SiO2) inclusions
igneous
Smoky quartz crystal/rough fragment
Quartz (SiO₂), likely smoky quartz
mineral
Likely black tourmaline (schorl) crystal
Schorl, a black iron-rich tourmaline; approximate formula NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Ferruginous Quartz
Quartz (Silicon Dioxide, SiO2) with Iron Oxide Inclusions
mineral
Snowflake Obsidian
Spherulitic Obsidian (Volcanic glass containing Cristobalite)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace Titanium, Manganese, or Iron
mineral
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Yellow quartz crystal (likely citrine)
Quartz, silicon dioxide (SiO₂), iron-colored variety commonly called citrine
mineral
Quartz Druzy (Quartz Druse)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Desert Rose
Gypsum (Selenite) Barite, CaSO4·2H2O
mineral
Snowflake Obsidian
Volcanic Glass with Spherulite inclusions (Amorphous SiO2 + Cristobalite)
igneous