Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Organic Gem Material (Botanical)
Browse organic gem material (botanical) specimens identified by the Rock Identifier community.
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Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Common Opal mix)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint in various colors)
Silicon Dioxide (SiO2)
sedimentary
Chert (River Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (with Quartz Druzy)
Microcrystalline Silica (SiO2)
sedimentary
Chert (often called Flint or Jasper)
Cryptocrystalline quartz (SiO2)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclasts
sedimentary
Sandstone with Algae Growth
Arenite with Chlorophyta/Lichen
sedimentary
Red Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Megalodon Shark Tooth (Partial Fossil)
Otodus megalodon (fossilized in Calcium Phosphate/Apatite)
Mineral/Fossil
Fossiliferous Limestone
Biogenic Limestone (CaCO3)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Petrified Wood
Silicified wood (principally SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
mineral
Chert (specifically Tan Chert or Flint)
Silicon Dioxide (SiO2)
sedimentary
Fossilized Shark Tooth
Eocene Lamniformes (Mackerel Shark clade)
fossil
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Dinosaur Bone (Gembone)
Agatized Dinosaur Bone
sedimentary
Chert (River Cobble)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Geode with Quartz Crystal Cavity
Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Chert Nodule (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert Nodule
Microcrystalline Silica (SiO2)
sedimentary
Chalcedony (Botryoidal or Tumbled)
Chalcedony (SiO₂)
mineral
Dinosaur Bone (Gembone)
Silicified Dinosaur Bone (SiO2 replacing organic tissue)
sedimentary
Chert (and Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert (Gravel pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Tan/Brown)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Chert (Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Chert / Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Nodule)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Ferruginous Sandstone (with possible trace fossils)
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3)
sedimentary
Rough Emerald
Beryl (Be3Al2(SiO3)6 with Chromium/Vanadium impurities)
mineral
Chrysocolla
Hydrated copper silicate - Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O
mineral
Zebra Rock / Zebra Marble
Banded Limestone-Marble Transition
metamorphic