Septarian Nodule (Yellow Jasper variety)
Septarian Nodule (comprising Calcite, Aragonite, and Limestone/Bentonite)
sedimentary
Category
Mineral (Man Made Glass, Not Natural)
Browse mineral (man made glass, not natural) specimens identified by the Rock Identifier community.
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)
Mineral
Natural Gemstone Cabochons (Ruby, Moonstone, Emerald, Citrine)
Ruby (Al2O3:Cr), Moonstone (KAlSi3O8), Emerald (Be3Al2(SiO3)6:Cr), Citrine (SiO2)
mineral
Snowflake Obsidian
Volcanic glass with Cristobalite inclusions (70–75% SiO2)
Igneous
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with impurities)
igneous
Marble
Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.
Metamorphic Rock
Rutilated Quartz (likely Citrine or Smoky Quartz with Rutile inclusions)
SiO2 with TiO2 inclusions (Quartz with Rutile)
Mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrous phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O
mineral
Diamond
Diamond (C)
Mineral
Turquoise
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
mineral
Green Tourmaline (Verdelite)
Elbaite (Complex Borosilicate: Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)
mineral
Ruby
Corundum (Al2O3:Cr)
mineral
Dyed Agate Slice
Silicon Dioxide (SiO2) with artificial colorants
Mineral (variety of Chalcedony)
Jasper (Multi-colored) / Sea Glass Slag
Silicon Dioxide (SiO2) with impurities of Iron Oxide
Sedimentary (if natural Jasper) or Artificial (if Slag)
Quartz Pebble (Chert/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Volcanic glass containing Spherulite inclusions (primarily Cristobalite, SiO2)
igneous
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium) CuAl6(PO4)4(OH)8·4H2O
mineral
Diamond
Diamond (Carbon, C)
Mineral
Borosilicate Glass (Manufactured)
SiO2 + B2O3 (Silicon dioxide and Boron trioxide)
Synthetic/Amorphous Solid
Diamond
Diamond (C)
Mineral
Peridot (Olivine)
Olivine, (Mg,Fe)2SiO4
Mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium fluoride (CaF2)
mineral
Ruby (set in a gold pendant)
Ruby (Variety of Corundum, Al2O3)
mineral
Obsidian
Extrusive igneous volcanic glass (rich in SiO2)
igneous
Pebble
Clast (specifically a granule or small pebble)
Sedimentary
Pink Feldspar (Orthoclase)
Orthoclase Feldspar (KAlSi3O8)
mineral
Gold Nugget
Native Gold (Au)
mineral
Amber
Succinite (specifically for Baltic amber; general formula C10H16O)
Mineraloid (Organic)
Shale
Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)
sedimentary
Pebble (likely Quartzite or Chert)
Clastic Sediment, potentially composed of SiO₂ (Quartz)
Mineral, Sediment
Sandstone
Arenite or Sandstone
Sedimentary Rock
Obsidian
Volcanic glass
igneous
Gold Nugget (Placer Gold)
Native Gold (Au)
mineral
Diamond
Diamond (C)
Mineral
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Carnelian and White Quartz Bracelet
Silicon Dioxide (SiO2) - specifically Carnelian (Chalcedony) and Rock Crystal/Snow Quartz
mineral
Bi-Color Tourmaline (or Watermelon Tourmaline)
Tourmaline (complex borosilicate mineral group with general formula AD3G6(BO3)3T6O18(OH,O)4)
Mineral
Amethyst
SiO2 (Silicon Dioxide with Iron impurities and natural radiation influence)
mineral
Nephrite Jade
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)
Mineral
Turquoise
Hydrous phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)
mineral