Sapphire
Corundum (Al2O3)
mineral
Category
Mineraloid Like Synthetic Material
Browse mineraloid like synthetic material specimens identified by the Rock Identifier community.
Goldstone (Red)
Aventurine Glass (Cupriferous glass)
Synthetic Glass (Man-made)
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2 permineralization)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fluorite (Green Fluorite)
Calcium Fluoride (CaF2)
mineral
Scoria
Vesicular Basaltic Glass
igneous
Petrified Wood
Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)
metamorphic
Gastropod Internal Mold (Steinkern)
Class Gastropoda fossil mold (Phylum Mollusca)
sedimentary
Diorite (Polished Tumble)
Diorite (Intermediate intrusive igneous rock)
Igneous
Orange Quartz with Epidote
Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate hydroxide (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
mineral
Sandstone
Arenite (Sedimentary rock comprising sand-sized grains)
sedimentary
Gold and Cubic Zirconia (San Judas Tadeo Pendant)
Native Gold (Au) with Synthetic Cubic Zirconia (ZrO2)
mineral
Aquamarine
Aquamarine (Beryl variety); Be3Al2Si6O18
mineral
Chert (often called Flint in archaeological contexts)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Green Glass Cullet / Recycled Glass
Amorphous Silicon Dioxide (SiO2) with various metal oxides
Man-made Glass (Not a natural rock or mineral)
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Sodalite
Sodalite (Na4Al3Si3O12Cl)
Mineral
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Mineral
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Sandstone (Ferruginous)
Arenite with Iron Oxides
sedimentary
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Crushed Stone (Gravel/Aggregates)
Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)
sedimentary and igneous (mixed)
Sandstone
Arenite (SiO2 primarily)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Asphalt Concrete (Bituminous Conglomerate)
Anthropogenic Bituminous Conglomerate
sedimentary
Sandstone
Arenite (primarily SiO2 with trace Fe2O3)
sedimentary
Fursuit (Synthetic Fur Specimen)
Canis anthropomorphus syntheticus
Anthropomorphic Textile Construct
Pumice
Pumice (Vesicular volcanic glass / Rhyolite or Trachyte)
igneous
Chert (specifically Tan/Gray Chert)
Microcrystalline quartz (SiO2)
sedimentary
Concrete / Conglomerate (Man-made)
Artificial Conglomerate (Cementitious Composite)
sedimentary
Sandstone (likely Arkosic or Quartzose)
Sandstone (SiO2 dominated)
sedimentary
Blue Topaz (specifically London Blue or Swiss Blue based on color saturation)
Al2SiO4(F,OH)2 (Aluminum Silicate Fluoride Hydroxide)
mineral
Sandstone (Ferruginous)
Arenite (with Iron Oxide)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Diamond
Native Carbon (C)
mineral
Obsidian
Volcanic Glass (Extrusive Igneous Rock, primarily SiO2)
igneous
Coquina
Bioclastic Limestone (Coquina)
sedimentary