Yellow Aventurine
Silicon Dioxide (Quartz) with inclusions (SiO2)
Metamorphic rock
Category
Granite
Browse granite specimens identified by the Rock Identifier community.
Chert (Novaculite Variety)
Microcrystalline Quartz (SiO2)
sedimentary
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
mineral
Obsidian
Volcanic Glass (SiO2)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Banded Agate
Microcrystalline Quartz (SiO2) with impurities
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Shungite
Non-crystalline carbon (Fullerenes)
metamorphic
Chert (Chert / Flint)
Silicon Dioxide (SiO2)
sedimentary
Red Beryl
Bixbite (Be3Al2Si6O18 with Mn3+ ions)
mineral
Anthracite Coal
Anthracite (Carbon-rich Sedimentary Rock)
sedimentary
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Tiger's Eye
Tiger's Eye (SiO2 with crocidolite inclusions)
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Ironstone Concretion
Siderite or Ferruginous Concretion (FeCO3 or Iron Oxides)
sedimentary
Gold Mineral
Native Gold (Au)
mineral
Blue Tiger's Eye (Hawks Eye)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Purple Chalcedony (likely dyed Agate)
Silicon Dioxide (SiO2)
mineral
Concretion (Sandstone)
Sandstone Concretion
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Placer Gold Nugget
Native Gold (Au)
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (Gravel pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Basalt
Extrusive mafic igneous rock
igneous
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz (Pebble)
Silicon Dioxide (SiO2)
mineral
River Stone (Basalt)
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Limonite (Ironstone)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Amethyst (Variety of Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Chevron Amethyst
Silicon Dioxide (SiO2) with trace Iron (Fe4+)
mineral