Dendritic Quartz
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Category
Man Made Byproduct (Often Mistaken For Obsidian Or Emerald)
Browse man made byproduct (often mistaken for obsidian or emerald) specimens identified by the Rock Identifier community.
Pyrite (on Quartz matrix)
Iron Disulfide (FeS2)
mineral
Hypersthene (or Enstatite/Ferrosilite)
Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)
Mineral
Peridot
Olivine (specific variety: gem-quality forsterite), (Mg,Fe)2SiO4
Mineral
Amethyst
Silicon dioxide (SiO2) containing traces of iron and manganese
mineral
Raw Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Diopside (likely Chromian Diopside)
Diopside, part of Clinopyroxene family of inosilicates. Chemical formula: CaMgSi2O6. The green variety is often Chromian Diopside due to chromium impurities.
mineral
Emerald in Matrix
Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Chert (often called Flint for darker varieties)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineraloid
Obsidian
Amorphous volcanic glass (primarily SiO2)
igneous
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Raw Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium)
mineral
Opalite (Synthetic Moonstone/Opal)
Synthetic Silica Glass
mineraloid (synthetic)
Obsidian
Obsidian (Volcanic Glass)
Igneous
Peridot
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
mineral
Obsidian
Obsidian (Volcanic Glass)
igneous
Concrete with Aggregate
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Polymer Clay (Mock Mineral)
Polyvinyl chloride (PVC) with plasticizers and pigment
Synthetic material (Not a natural rock/mineral)
Raw Emerald
Beryl (Be3Al2(SiO3)6) with Cr/V impurities
mineral
Alexandrite
Chrysoberyl (BeAl2O4)
mineral
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with impurities)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Diamond
Diamond (pure carbon C)
mineral
Granite
Granite (felsic intrusive igneous rock)
igneous
Diamond
Native Carbon (C)
mineral
Beryl (likely Emerald or Aquamarine in matrix)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Obsidian
Obsidian (Volcanic Glass), primarily SiO2
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Man-made earbud charging case (Not a rock or mineral)
Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components
Synthetic/Man-made object
Chalcopyrite
Chalcopyrite (CuFeS2)
mineral
Sandstone
Arenite (variable SiO2 composition)
sedimentary
Rough Emerald
Beryl (Be3Al2(SiO3)6 with Chromium/Vanadium impurities)
mineral
Obsidian
Obsidian (Volcanic Glass)
igneous
Jade (Nephrite or Jadeite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)
Metamorphic Rock / Mineral
Lava Rock with Fabric Impression
Scoria or Basalt with anthropogenic impressions
igneous
Obsidian
Obsidian (volcanic glass; primarily SiO2)
igneous
Opalite
Synthetic Glass (Amorphized Silicon Dioxide)
mineraloid
Sandstone
Arenite (primarily SiO2)
sedimentary
Obsidian (Apache Tear)
Amorphous Volcanic Glass (SiO2 + impurities)
igneous
Quartz
SiO₂ (Silicon Dioxide)
Mineral