Sandstone Concretion
Clastic Sedimentary Rock (primarily SiO2 with mineral cement)
sedimentary
Category
Man Made Object (Ring)
Browse man made object (ring) specimens identified by the Rock Identifier community.
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Aura Quartz (Titanium/Gold coated)
Silicon Dioxide (SiO2) with metallic vapor deposition
mineral
Iron Slag
Iron/Steel Slag (Ferrosilicate Glass)
industrial byproduct (anthropogenic material)
Iron Slag (Industrial Byproduct)
Anthropogenic Vitrification Product/Ferrous Slag
Mineral-like Industrial Smelting Waste
Slag Glass
SiO2 (Silicon Dioxide) with impurities
man-made glass
Opalite
Synthetic Glass, SiO2 base with metallic inclusions
mineraloid (synthetic)
Opalite
Synthetic Opalized Glass
mineraloid (man-made)
Blue Glass or Slag Glass
Amorphous Silica (Anthropogenic Glass)
mineral
Diamond
Carbon (C)
gemstone
Diamond
Carbon (C)
gemstone
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2
Mineral
Black Obsidian
Amorphous volcanic glass (SiO2 + impurities)
igneous
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Carved Stone Turtle
Mixed stone carving
carved stone
Conglomerate
Conglomerate Rock (Paraconglomerate)
sedimentary
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Slag
Ferrous Slag (Amorphous calcium-magnesium-aluminum silicates)
igneous (artificial/anthropogenic)
Diamond (Cut Gemstone)
Carbon (C)
gemstone
Titanium Amethyst Geode
Silicon Dioxide (SiO2) with Titanium/Metal Vapor Deposition Layer
mineral
Heliotrope (Bloodstone)
Chalcedony quartz variety (SiO2) with hematite or jasper inclusions
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Opalite
Synthetic Opalised Glass
mineraloid (synthetic)
Carborundum (Silicon Carbide)
Silicon Carbide (SiC)
mineral (synthetic)
Diamond (in a jewelry setting)
Carbon (C)
mineral
Slag (Industrial Glass/Glassy Rock)
Anthropogenic Vitreous Material
igneous
Aura Quartz
Titanium/Titanium-Gold treated Silicon Dioxide (SiO2)
mineral
Sea Glass (White/Clear)
Amorphous Silica (Alkali-Lime-Silica Glass), SiO2 + Na2O + CaO
Anthropogenic (Man-made product subject to geological processes)
Red Slag Glass
Amorphous Silica (Industrial byproduct with metallic oxide dopants)
Mineraloid / Industrial Byproduct
Granite with Cupules / Bedrock Mortars
Granite (felsic intrusive plutonic rock)
igneous
Goldstone (aventurine glass)
Synthetic copper-bearing soda-lime glass; commonly sold as red goldstone
gemstone
Goldstone
Aventurine Glass (Man-made glass with copper inclusions)
mineraloid / man-made glass
Blue Goldstone
Man-made glass with suspended copper, cobalt, or manganese particles
man-made glass
Diamond (Colorless/White)
Carbon (C)
mineral
Green Glass (often marketed as 'Obsidian' or 'Green Quartz')
Amorphous Silica (SiO2) with copper or chromium additives
Mineraloid (Man-made)
Cullet Glass (sometimes mistaken for Blue Obsidian or Slag)
Amorphous Silicon Dioxide (SiO2) with chemical additives (e.g., Cobalt for blue color)
mineraloid / industrial byproduct
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
mineral
Blue Crackle Quartz (Dyed Quarzite)
Silicon Dioxide (SiO2) with artificial dye
Metamorphic (modified)