Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Category
Man Made Glass (Not A Natural Rock Or Mineral)
Browse man made glass (not a natural rock or mineral) specimens identified by the Rock Identifier community.
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Porous iron-rich rock or slag-like material
Unidentified; possibly limonite/goethite-rich ironstone
igneous
Amethyst (with Pyrite and other minerals)
Silicon Dioxide (SiO2)
mineral
Metallic sulfide mineral fragment, likely galena
Galena (lead sulfide, PbS), tentative identification
mineral
Corundum (Sapphire/Ruby in Matrix)
Corundum (Al2O3)
mineral
Strawberry Quartz (or Pink Aventurine)
Quartz with Hematite/Goethite inclusions (SiO2)
mineral
Black tumbled stone, possibly obsidian
Obsidian (natural volcanic glass; composition varies, typically silica-rich)
igneous
Stamped concrete made to resemble flagstone
Portland-cement concrete with decorative stone-textured finish
sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Corundum (Sapphire variant)
Aluminium oxide (Al2O3)
mineral
Sandstone
Arenite
sedimentary
Diamond (as set in a metal alloy ring)
Diamond (Pure Carbon, C)
mineral
Obsidian
Volcanic Glass (Silica-rich glass)
igneous
Sandstone
Arenite (SiO2 composition dominant)
sedimentary
Sandstone
Sandstone (SiO2-rich detrital sedimentary rock)
sedimentary
Sandstone
Sandstone (Sedimentary rock composed of silicate grains)
sedimentary
Carved red jasper bead (likely ceramic imitation)
Jasper, microcrystalline quartz (SiO₂); exact material uncertain from the image
mineral
Grey Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Red heart-shaped glass bead in a wire-wrapped jewelry charm
Likely colored glass (amorphous silica-based material); the image does not show an identifiable geological specimen
gemstone
Sandstone
Arenite (SiO2 primarily)
sedimentary
Granite
Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Sandstone
Arenite (mostly SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Diamond
Diamond (pure native carbon, C)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Diamond (in Jewelry Setting)
Carbon (C)
gemstone
Green Slag Glass
Amorphous Silica / Glassy Blast Furnace Slag
Mineraloid (Industrial byproduct)
Sandstone
Arenite (SiO2, often with CaCO3 or Fe2O3 cement)
sedimentary
Red agate bead (likely dyed or treated)
Agate, a microcrystalline variety of quartz; SiO₂
gemstone
Carved smoky quartz (likely)
Quartz, silicon dioxide (SiO₂), smoky variety
mineral
Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)
Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)
sedimentary
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Asphalt Pavement (with aggregate)
Asphalt concrete
man-made composite
Quartz
Silicon dioxide (SiO₂)
Mineral
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Multicolor quartz bead bracelet
Quartz (silicon dioxide, SiO₂); bead colors may be from different varieties or treated quartz
gemstone
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Faceted clear gemstone in a gold-tone ring, likely colorless glass or cubic zirconia
Undetermined; possible cubic zirconia (ZrO₂) or glass (amorphous SiO₂)
gemstone
Diamond
Native Carbon (C)
mineral
Granite
Granite (a phaneritic intrusive igneous rock consisting mainly of quartz, alkali feldspar, and plagioclase)
igneous