Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Antropogenic (Man Made Material)
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US Penny
Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy
Man-made object (metal alloy)
Chert
Silicon dioxide (SiO2)
Sedimentary
Polished stone sphere, possibly agate or jasper
Likely microcrystalline quartz (SiO₂); exact variety cannot be confirmed from the image
mineral
Tumbled serpentine
Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximately Mg₃Si₂O₅(OH)₄
metamorphic
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Likely flint (dark chert)
Microcrystalline quartz (SiO₂), commonly called chert or flint
sedimentary
Fossilized Coral (Coquina/Limestone)
Cnidaria Anthozoa (Fossilized)
sedimentary
Granite / Diorite (Granodiorite)
Granodiorite / Quartz Diorite
igneous
Asphalt (Bituminous Concrete)
Composite material (bitumen binder with mineral aggregate)
man-made rock (technosol)
Sandstone
Arenite
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Engineered Quartz Stone
Agglomerated Quartz (SiO2 + Polymer Resin)
mineral-based composite
Sandstone
Arenite (with iron oxide cement)
sedimentary
Coquina
Biogenic Limestone (Coquina)
sedimentary
Tumbled greenstone, likely nephrite jade
Nephrite jade (interlocking tremolite–actinolite amphibole; Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂)
metamorphic
Chert (Siltstone / Flint)
SiO2 (Cryptocrystalline Quartz)
sedimentary
Blue-green chrysocolla rough specimen
Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite
mineral
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Likely flint pebble (possibly a worked flint fragment)
Microcrystalline quartz (chalcedony), SiO₂; commonly called flint
sedimentary
Sandstone (Quartzose)
Sandstone (SiO2 dominated)
sedimentary
Chert (varieties: Flint or Jasper)
Silicon dioxide (SiO2) / Microcrystalline Quartz
sedimentary
Banded Chert (River Stone)
Silicon Dioxide (SiO2)
sedimentary
Chert / Flint
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Commonly known as Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Common Chert Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Green iridescent glass cabochon or synthetic gemstone
Likely synthetic glass; possibly coated synthetic quartz or lab-created green gemstone
gemstone
Sandstone (with potential Arkose/Lithic characteristics)
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Sandstone
Arenite (SiO2 composition dominant)
sedimentary
Polished/tumbled brown-and-white mineral fragment
Indeterminate; possibly quartz-rich jasper, brecciated jasper, or an iron-stained quartz mineral
mineral
Colorless faceted gemstone, likely quartz
Quartz (SiO₂), tentative identification; the photo is insufficient to confirm the material
gemstone
Red Sandstone
Arenite (Fe2O3 enriched)
sedimentary
Synthetic Marbled Aggregate (Footwear Component)
Ethylene-vinyl acetate (Croslite™)
not a rock (man-made polymer)
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Flint or chert fragment
Microcrystalline quartz (SiO₂), likely flint/chert
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (Yellow/Tan variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert Nodule (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Diamond
Diamond (Pure Carbon, C)
mineral
Green Quartzite
Metamorphic Quartzite (often colored by chromium-bearing minerals or fuchsite)
metamorphic