Siltstone or Fine-grained Sandstone pebble
Siltstone (primarily SiO2 with clay minerals)
sedimentary
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Quartz (Sunstone-like Chalcedony)
Silicon Dioxide (SiO2)
mineral
Shale or Siltstone
Sedimentary Clastic Rock (Variable mineral composition including quartz and clay minerals)
sedimentary
Kimberlite
Kimberlite
igneous
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Travertine (often colloquially called Tufa)
Chemical Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Chert (Green Chert/Jasper)
Chert (primarily Microcrystalline Quartz, SiO2)
sedimentary
Silver Nugget
Native Silver (Ag)
mineral
Quartzite (or Quartz Slab)
SiO2 (Silicon Dioxide)
metamorphic
Ruby (Raw Corundum)
Al2O3 (Aluminum Oxide)
mineral
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Chert (Jasper/Flint variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz (Double-Terminated)
Silicon Dioxide (SiO2)
mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Quartz Druzy (on Calcedony/Quartz base)
Silicon Dioxide (SiO2)
mineral
Botryoidal Pyrite
Iron Sulfide (FeS2)
mineral
Chert (specifically Flint or Dark Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Milky Quartz (Crystal Cluster)
Silicon Dioxide (SiO2) - Quartz Variety
mineral
Tumbled orbicular jasper
Orbicular jasper; microcrystalline quartz (SiO₂) with iron oxides and feldspathic/chalcedony inclusions
sedimentary
Agate
Chalcedony (SiO2) with impurities
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
Mineral/Sedimentary
Chert (Yellow Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (and Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (SiO2 with Iron Oxide impurities)
sedimentary
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Pegmatite
Igneous Pegmatite
igneous
Chert (varieties: Flint or Chalcedony)
Microcrystalline silica (SiO2)
sedimentary
Chert (Arrowhead variety)
Chert (SiO2)
sedimentary
Chalcedony (Agate/Quartz variety)
Cryptocrystalline Quartz (SiO2)
mineral
Copper Nugget
Native Copper (Cu)
mineral
Chert (Commonly known as Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Pyrite in Matrix
Iron Sulfide (FeS2)
mineral
Chert (Chalcedony/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
River Siltstone / Mudstone Pebble
Siltstone (composed of mixed silicate and carbonate minerals)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Mica-rich Sandstone or Micaceous Schist Weathering
Micaceous Schist (Muscovite-Quartz composition)
Metamorphic or Sedimentary depending on local grade
Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 inclusions)
sedimentary
Kyanite
Kyanite (Al2SiO5)
mineral
Sandstone with Secondary Mineral Encrustation
Arenite with Silica/Calcite deposits (SiO2 or CaCO3)
sedimentary
Agate (Grey Agate Slice)
Microcrystalline Quartz (SiO2)
mineral