Chert (specifically Jasper or Brown Chert node)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Mineraloid Like Synthetic Material
Browse mineraloid like synthetic material specimens identified by the Rock Identifier community.
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Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Rose Quartz
SiO2 (Silicon Dioxide)
mineral
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert (River Pebble)
Silicon Dioxide (SiO2)
sedimentary
Obsidian Arrowhead
Volcanic Glass (SiO2)
igneous
Petrified Wood
Siliconized Wood (SiO2)
sedimentary
Likely petrified wood
Silicified wood, chiefly microcrystalline quartz (SiO₂)
fossil
Banded Siltstone
Siltstone (primarily composed of silt-sized grains)
sedimentary
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Chert (often called Flint)
Silicon Dioxide (SiO2)
sedimentary
Sandstone Cobble
Arenite (Sandstone)
sedimentary
Granitoid (Granitic Rock)
Granitoid (Quartzo-feldspathic plutonic rock)
igneous
Peridot (Olivine)
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
mineral
Fulonite (Fulgurite-like)
Fulgurite (SiO2 fused silica/lechatelierite)
Metamorphic (Pseudo-igneous)
Chert (specifically Flint or Common Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Aura Quartz (Rainbow Quartz)
Silicon Dioxide (SiO2) with metallic vapor coatings
mineral
Chert (often called Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Flint Pebbles)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Ammonite Fossil (Small Pyritized or Calcitized Internal Mold)
Ammonoidea
sedimentary
Olivine (Peridot)
(Mg,Fe)2SiO4
mineral
Biotite (Mica)
Biotite group (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Quartz (specifically Clear and Rose Quartz)
Silicon Dioxide (SiO2)
mineral
Chert pebble
Cryptocrystalline Quartz (SiO2)
sedimentary
Fossil Shark Tooth
Chondrichthyes (Class)
fossil
Fossil Shark Teeth (likely Sand Tiger Shark)
Carcharias taurus (fossilized dentition)
fossil
Mother of Pearl (Nacre)
Aragonite (CaCO3) with Organic Matrix
mineral
Limonite (Gozzany Iron)
Limonite (FeO(OH)·nH2O)
mineral
Fossilized Shark Tooth (Basal Bone)
Otodus sp. (Mineralized Hydroxyapatite)
sedimentary
Chert (River Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Cherty Shale / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (specifically Yellow/Honey Jasper variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Yellow Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Field Stone)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint variety)
Chert (SiO2)
sedimentary
Travertine
Terrestrial Sedimentary Calcite (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Polished orange agate/jasper cabochon
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide coloration; exact variety uncertain
mineral