Obsidian
Volcanic Glass (SiO2)
Category
Browse not a rock (animated character) specimens identified by the Rock Identifier community.
Obsidian
Volcanic Glass (SiO2)
Moss Agate
Chalcedony (Silicon Dioxide - SiO2) with inclusions
Limonite pseudo-concretion (Ironstone)
Limonite (FeO(OH)·nH2O) / Goethite
Limonite (Iron Ore)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
Dyed Agate
Chalcedony (SiO2)
Diorite (Dalmatian Stone)
Phaneritic Plutonic Diorite
Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH,F,O)4)
Amethyst
SiO2 (Silicon Dioxide with iron impurities)
Dyed Blue Agate Slice
Silicon Dioxide (SiO2)
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Aventurine Quartz
Silicon Dioxide (SiO2) with inclusions (typically Fuchsite/Mica)
Common Opal
Hydrated silica (SiO2 "n"H2O)
Tumbled green aventurine (probable)
Quartz, SiO₂, with fuchsite or other green mica inclusions
Limonite (Iron Ore)
Limonite (Hydrated iron oxide - FeO(OH)·nH2O)
Limonite (Iron Ore)
Goethite and related iron hydroxides (FeO(OH)·nH2O)
Epidote-bearing Rock / Epidote Inclusion
Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) in host rock
Carnelian
Carnelian (Silicate mineral, SiO2)
Blue Moss Agate
Silicon Dioxide (SiO2) with mineral inclusions
Amethyst (Tumbled)
Quartz (Silicon Dioxide, SiO2) with iron impurities
Limonite
FeO(OH)·nH2O
Limonite / Goethite (Ironstone Nodule)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
Serpentinite (Commonly known as Serpentine)
Antigorite, Lizardite, or Chrysotile [(Mg,Fe)3Si2O5(OH)4]
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Amethyst
SiO2 (Silicon Dioxide with iron impurities)
Peach Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
Limonite / Ironstone Nodule
Limonite (Hydrated iron(III) oxide-hydroxide), FeO(OH)·nH2O
Banded Agate (specifically Lace Agate type)
Silicon Dioxide (SiO2)
Pyrite
Iron Sulfide (FeS2)
African Turquoise
African Turquoise (a trade name for Jasper, a variety of Chalcedony: SiO2)
Amethyst Quartz
Silicon Dioxide (SiO2) with iron impurities
Carnelian (Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Amethyst
Quartz (Silicon Dioxide with iron impurities), SiO2
Amethyst
SiO2 (Silicon Dioxide with Iron impurities and irradiation)
New Jade (Serpentine)
Antigorite / Serpentine group (Mg3Si2O5(OH)4)
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
Bauxite (Laterite)
Hydrated aluminum oxides (Al2O3·nH2O)
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
Yellow Jasper (Chalcedony)
Silicon Dioxide with Iron inclusions (SiO2)
Quartz Geode
Silicon Dioxide (SiO2)
Hematite
Hematite (Fe2O3)
Fluorite on Host Rock
Calcium Fluoride (CaF2)