Diorite
Diorite
igneous
Category
Anthropogenic (Man Made Artifact)
Browse anthropogenic (man made artifact) specimens identified by the Rock Identifier community.
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Basalt (Worn Cobble / Artifact)
Aphanitic Extrusive Igneous Rock
igneous
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Carnelian Bead
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Chert (often called Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Black beaded bracelet, likely black onyx or glass
Possibly chalcedony (microcrystalline quartz, SiO₂); the beads may instead be man-made glass
mineral
Granodiorite
Phaneritic Granodiorite
igneous
Chert (Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Mixed beach-stone and tumbled-glass collection
Predominantly uncertain rocks (likely basalt, granite, and quartz-bearing stones) with anthropogenic glass; one possible banded agate or jasper
mineral
Chert (Flint)
Chert (SiO2)
sedimentary
Chert (Nodule)
Chert (Alpha-Quartz, SiO2)
sedimentary
Chert / Flint (Artifact)
Microcrystalline Quartz (SiO2)
sedimentary
Flint (chert), likely a worked stone flake
Microcrystalline quartz (SiO₂); cryptocrystalline variety of quartz
sedimentary
Chert (Quartz Variety)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Chocolate or Brown Flint)
Chert (SiO2)
sedimentary
Chert (often called Flint for darker varieties)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Lapis lazuli bead bracelet
Lapis lazuli, chiefly lazurite (Na₃Ca(Si₃Al₃)O₁₂S); commonly with calcite and pyrite
metamorphic
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Chert (varieties include Flint and Mudstone)
Microcrystalline Silica (SiO2)
sedimentary
Chert (Lithic flake / Arrowhead fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Blue Dyed Quartzite
Silicon Dioxide (SiO2) with artificial pigment
metamorphic
Chert (specifically Zebra Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Green cabochon gemstone, likely nephrite jade
Nephrite jade—interlocking amphibole fibers, chiefly tremolite-actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂
gemstone
N/A - Man-made object (Jewelry Chain)
Antiqued or Oxidized Metal Chain (often Steel or Brass)
Mineral (processed metal)
Cullet Glass (Man-made Glass Slag)
Amorphous Silica (SiO2) with chemical additives
Mineraloid
Chert / Flint
Silicon Dioxide (SiO₂)
sedimentary
Iron-rich concretion or slag-like mineral fragment
Likely limonite/goethite (FeO(OH)·nH₂O), possibly magnetite-bearing material
mineral
Chert or fine-grained slate-like stone
Microcrystalline quartz (SiO₂), possibly siliceous shale or slate
sedimentary
Cobalt Glass Slug (Man-made Glass)
Amorphous Silica with Cobalt Oxide (SiO2 + CoO)
mineraloid
Chert / Flint Tool
Cryptocrystalline quartz (SiO2)
sedimentary
Obsidian Arrowhead
Volcanic Glass (predominantly SiO2)
igneous
Basalt Metate
Vesicular Basalt
igneous
Slag (Industrial By-product)
Anthropogenic Vitreous Silica/Iron Silicate
mineral
Chert (variations include Flint/Novaculite)
Chert (formula: SiO2)
sedimentary
Chert (specifically Flint or Common Opal fragment)
Cryptocrystalline Silica (SiO2)
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Pitted Sedimentary Rock / Cupstone
Sedimentary rock with weathering pit (arenite / sandstone)
sedimentary
Green sea glass (likely bottle glass)
Human-processed soda–lime silicate glass; not a natural mineral or rock
mineral
Small dark mineral/rock fragment
Indeterminate; possibly magnetite-bearing basalt or iron-rich slag
mineral