Jadeite and Mixed Gemstones (Ruby, Sapphire, Emerald)
Jadeite (NaAlSi2O6), Corundum (Al2O3), Beryl (Be3Al2(Si6O18))
mineral
Category
Man Made Object (Ring)
Browse man made object (ring) specimens identified by the Rock Identifier community.
Corundum (Ruby variety)
Aluminium oxide (Al2O3)
mineral
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Slate
Foliated Metamorphic Rock (Mainly composed of Quartz, Illite, Chlorite)
metamorphic
Jasper and Aquamarine (likely)
Jasper (Cryptocrystalline Quartz (SiO2)), Aquamarine (Beryl (Be3Al2Si6O18))
Sedimentary (Jasper), Mineral (Aquamarine)
Green Aura Quartz
Silicon Dioxide (SiO2) bonded with metallic vapors (typically Gold, Chromium, or Titanium)
mineral
Fossiliferous Limestone
Limestone (composed primarily of calcite with included fossils CaCO3)
Sedimentary
Amethyst Geode (Carved)
Amethyst (Violet Crystalline Quartz - SiO2)
mineral
Corundum (Sapphire/Ruby in Matrix)
Corundum (Al2O3)
mineral
Rough Diamond
Native Carbon (C)
mineral
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2 (Silicon Dioxide)
mineral
Peridot and Citrine Gemstones (in a ring setting)
Peridot (Olivine: (Mg,Fe)2SiO4), Citrine (Quartz: SiO2)
mineral
Synthetic Faux Fur Fursuit
Polyacrylonitrile / Polyester (Synthetic Textile)
not a rock (synthetic material/costume)
Serpentinite
Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)
Metamorphic Rock
Note on Image Identification: Textile
N/A (Anthropogenic material)
not a rock
Chert (Jasper Variant likely)
Silicon Dioxide (SiO2)
Sedimentary Rock or Mineral (depending on origin and purity)
Digital Multimeter (Synthetic Object)
Digital Multimeter (DMM)
not a rock
Chert (Flint/Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Agate
Agate (a variety of Chalcedony, SiO2)
Mineral
Sandstone (with differential weathering)
Arenite / Quartz Sandstone (SiO2)
sedimentary
Jade (Nephrite or Jadeite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)
Metamorphic Rock / Mineral
Imperial Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz with Mineral Inclusions
Sedimentary
Synthetic Convention Badge (Plastic/PVC)
Polyvinyl Chloride (PVC) / Polycarbonate
mineraloid (synthetic)
Smoky Quartz
Smoky Quartz (SiO2)
Mineral
Rough Sapphire (Corundum)
Corundum (Al2O3)
mineral
Pumice
Pumice (Vitreous volcanic rock)
igneous
Chert (specifically Flint Arrowhead)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Obsidian
Obsidian (volcanic glass)
Igneous
Diamond (Cut jewelry specimen)
Diamond (pure Carbon, C)
mineral
Ruby in Matrix
Corundum (Al2O3)
mineral
Blue Lace Agate
Chalcedony (a form of Quartz) - SiO2
Mineral
Turquoise (Dyed Howlite or Magnesite imitation)
Hydrated phosphate of copper and aluminum / CuAl6(PO4)4(OH)8·4H2O
mineral
Banded Agate (likely Carnelian Agate or Sardonyx)
Agate is a common name for a microcrystalline variety of Quartz (SiO₂), specifically a form of Chalcedony.
Sedimentary Rock (technically a variety of Chalcedony)
Liesegang Banded Sandstone (Wonderstone)
Ferruginous Sandstone with Liesegang Rings
sedimentary
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Sandstone (Ferruginous)
Arenite (Fe2O3 dominant staining)
sedimentary
Obsidian
Volcanic Glass (70% or more SiO2)
igneous
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Coral (Precious Coral)
Corallium rubrum (Red Coral), Paracorallium japonicum (Momo Coral), Pleurocorallium elatius (Sardinian Coral), various other species within the Corallidae family. Chemically, it's primarily Calcium Carbonate (CaCO 3 ).
Mineral, Organic Gemstone
Sandstone Concretion
Sedimentary concretion
Sedimentary
Blue Lace Agate
Chalcedony (SiO2) with trace inclusions
mineral
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary