Granite
Phaneritic plutonic rock (SiO2 typically >69%)
igneous
Category
Crystal
Browse crystal specimens identified by the Rock Identifier community.
Gabbro
Gabbro
igneous
Amazonite
Microcline (KAlSi3O8 variant)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Angelite
Anhydrite (CaSO4)
mineral
Super Seven (Melody Stone)
Quartz with inclusions (Amethyst, Cacoxenite, Goethite, Lepidocrosite, Rutile, Smoky Quartz, and Clear Quartz)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace rutile/dumortierite
mineral
Carnelian
Carnelian Agate (SiO2)
mineral
Coarse-grained Granite (Quartz and Feldspar dominated)
Granitoid (KAlSi3O8 – NaAlSi3O3 – CaAl2Si2O8 – SiO2)
Igneous
Garnet Schist
Almandine Garnet in Schist (X3Al2(SiO4)3)
metamorphic
Yellow Quartz / Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Brown Antique Granite
Anorthosite (Technically a plutonic rock composed mainly of plagioclase feldspar)
igneous
Amethyst in Matrix
Silicon Dioxide with Iron Impurities (SiO2)
mineral
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Yellow Quartz (Citrine/Yellow Jasper Pebble)
Silicon Dioxide (SiO2)
sedimentary
Man-made Glass (Tumbled/Shaped)
Amorphous Silicon Dioxide (SiO2) with metal oxide colorants
Mineraloid (synthetic)
Geode or Concretion
Silica-rich Concretion or Unopened Geode (SiO2)
sedimentary
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Garnet (specifically Almandine or Pyrope)
Almandine: Fe3Al2(SiO4)3 or Pyrope: Mg3Al2(SiO4)3
mineral
Porphyritic Basalt
Porphyritic Basalt (with plagioclase phenocrysts)
igneous
Goldstone (Red)
Aventurine Glass (SiO2 + Cu)
Synthetic Glass (Often categorized as a simulated mineral)
Quartz Druzy on Matrix (likely Agate or Jasper)
Silicon Dioxide (SiO2) with various mineral inclusions
mineral
Almandine Garnet
Almandine (Fe3Al2Si3O12)
mineral
Basalt with Quartz/Zeolite Inclusions
Porphyritic Basalt (SiO2 with Aluminosilicates)
igneous
Pyrite (on host rock/ore)
Iron Sulfide (FeS2)
mineral
Amethyst/Smoky Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Almandine Garnet in Schist
Almandine, Fe3Al2(SiO4)3
metamorphic
Quartz Druzy on Matrix (with Copper Mineralization)
Silicon Dioxide (SiO2) with Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Honey Calcite Geode Segment
Calcite (Calcium Carbonate, CaCO3)
mineral
Porphyritic Basalt (Chinese Writing Stone)
Porphyritic Basalt with Feldspar Phenocrysts
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz with Pyrite inclusions
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions
mineral
Rose Quartz
Silicon Dioxide with traces of titanium, iron, or manganese (SiO2)
mineral
Granite Pegmatite
Coarse-grained Granite (SiO2 - Aluminum and Alkalies)
igneous
Pyrite in Matrix
Iron Sulfide (FeS2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Quartz Geode
Crystalline Silver Oxide (SiO2) in Calcareous Host
mineral
Galena in Quartz Matrix
Lead Sulfide (PbS) in Silicon Dioxide (SiO2)
mineral
Strawberry Quartz (Aventurine)
Silicon Dioxide with Hematite/Lepidocrocite inclusions (SiO2)
mineral