Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Organic (Non Rock)
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Chert (Brown Variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite Beach Pebble
Quartzite (primarily SiO2)
metamorphic
Quartz-veined metamorphic rock, likely greenschist or altered basalt
Chlorite–actinolite schist or metabasalt with a milky quartz vein
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Man-made Carved Stone (Scream Mask/Skull motif)
Carved Soapstone or Serpentine-rich rock
Anthropogenic (Man-made artifact)
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
sedimentary
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
Red Quartzite (Tumbled Pebble)
Quartzite (primarily SiO2 with hematite inclusions)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Travertine
Tufa limestone (CaCO3)
sedimentary
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic
Chert with Quartz Veining
Microcrystalline silica (SiO2)
sedimentary
Pumice
Pumice (Vesicular Felsic Glass)
igneous
Quartz Geode
Silicon Dioxide (SiO2) in sedimentary host rock
sedimentary
Limestone (Weathered)
Calcium Carbonate (CaCO3)
sedimentary
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (consisting primarily of SiO2)
metamorphic
Jasper Pebble
Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron Oxide Impurities
sedimentary
Gneiss (specifically a Banded Gneiss cobble)
Gneiss (composed mainly of Quartz, Feldspar, and Biotite/Amphibole)
metamorphic
Agate (Moss or Green Agate)
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite (Iron-rich Sandstone)
sedimentary
Quartzite
Quartzite (Metamorphic Quartz Arenite)
metamorphic
Moss Agate with Jasper
Chalcedony (SiO2 with inclusions)
mineral
Septarian Nodule
Septarian Concretion (CaCO3 with Siderite/Limonite streaks)
sedimentary
Travertine
Terrestrial Sedimentary Limestone (CaCO3)
sedimentary
Banded Flint (Polished Stripe Flint)
Silicon Dioxide (SiO2) - variety of Chert
sedimentary
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Chert (Jasper/Agate Peat)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite with inclusions
Metamorphosed quartz sandstone
metamorphic
Quartzite
Crystalline silica (SiO2)
metamorphic
Quartzite
Metamorphic rock predominantly composed of Quartz (SiO2)
metamorphic
Fossiliferous Limestone / Fossil Fragment
Calcium Carbonate (CaCO3) with indeterminate biogenic remains
fossil
Fossilized Shark Tooth
Chondrichthyes (class) fossilized tooth
fossil
Banded Chert (likely Flint or Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Chert (composition: SiO2)
sedimentary
Chert (with Drusy Quartz Pocket)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (with Quartz veins)
Microcrystalline Quartz (SiO2)
sedimentary