Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Synthetic (Man Made Material Mimicking Natural Stone)
Browse synthetic (man made material mimicking natural stone) specimens identified by the Rock Identifier community.
Learn about Synthetic (Man Made Material Mimicking Natural Stone) in the encyclopedia
View all →
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Chert (Flint / Jasper)
Silicon Dioxide (SiO2)
sedimentary
Diamond (in Jewelry Setting)
Carbon (C) - Isometric-Hexoctahedral
mineral
Sandstone
Sedimentary rock composed mainly of quartz sand
sedimentary
Hag Stone (Flint with natural hole)
Silicon Dioxide (SiO2) - Nodular Chert / Flint
sedimentary
Mottled gabbro or diorite pebble
Coarse-grained mafic/intermediate intrusive rock; chiefly plagioclase feldspar plus pyroxene, with possible amphibole or biotite
igneous
Tumbled purple agate (likely grape agate or amethystine chalcedony)
Microcrystalline quartz, SiO₂; purple coloration commonly from iron, manganese, or inclusions
mineral
River Stone (Quartzite/Siltstone)
Quartzite (primarily SiO2)
metamorphic
Clay Brick
Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)
metamorphic (man-made/anthropogenic)
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Tumbled honey-colored chalcedony or quartzite
Microcrystalline quartz, SiO₂; exact identification requires testing
mineral
Sandstone
Arenite
sedimentary
Chert (with nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (often called Flint or Jasper if reddish)
Microcrystalline Quartz (SiO2)
sedimentary
Granite or granitic rock fragment
Felsic intrusive igneous rock, typically quartz + feldspar + mica; exact species uncertain from the image
igneous
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Quartzite
SiO2 (Silicon Dioxide / Metamorphic Quartz)
metamorphic
Chert (often called Flint or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
River Rock (Sandstone or Quartzite)
Clastic Sedimentary Rock / Quartzite
sedimentary
Yellow Chert (Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Diamond (or Diamond Simulant)
Carbon (C) or Zirconium dioxide (ZrO2) for CZ
gemstone
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Diamond (in a gold setting)
Carbon (C)
mineral
Sandstone
Arenite
sedimentary
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Strawberry Quartz (or Pink Aventurine)
Quartz with Hematite/Goethite inclusions (SiO2)
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Petrified Wood (Silicified Wood)
Silicified Paleoflora (mainly Quartz, SiO2)
metamorphic
Chert (and Jasper) Nodules in Limestone
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Silica (SiO2) quartzite
metamorphic
Tumbled brown pebble
Indeterminate; likely quartz-rich sandstone or chert
sedimentary
Chert (Nodule)
Chert (Alpha-Quartz, SiO2)
sedimentary
Sandstone
Sandstone (SiO2 dominated)
sedimentary
Granite
Phaneritic plutonic rock (dominated by Quartz, Feldspar, and Mica)
igneous