Flint / Chert
Microcrystalline Quartz (SiO2)
sedimentary
Category
Synthetic Polymer (Synthetic Material)
Browse synthetic polymer (synthetic material) specimens identified by the Rock Identifier community.
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Polished Red Quartz (or Carnelian / Red Jasper)
Silicon Dioxide (SiO2)
mineral
Gravel or Crushed Stone
Fragmented Aggregate Stone
sedimentary or igneous fragment
Quartz vein in dark host rock
Quartz (SiO₂), likely in basalt, gabbro, or altered mafic rock
mineral
Chert Nodules
Chert (Silicon Dioxide, SiO2)
sedimentary
Small pale rock fragment
Indeterminate; possibly quartz, calcite, or a weathered feldspar-rich fragment
mineral
Chert Arrowhead (Projectile Point)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Chalcedony / Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with fossil inclusions
sedimentary
Sandstone
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Petrified Coral Fossil
Rugose or Tabulate Coral (Hexagonaria or similar fossilized cnidarian)
fossil
Granodiorite
Phaneritic intrusive igneous rock
igneous
Quartz (Yellow/Citrine variety or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Quartzite Pebble
Quartzite (composed primarily of SiO2)
metamorphic
Milky Quartz Geode / Chalcedony Nodule
Quartz (Silicon Dioxide - SiO2)
mineral
Quartzite pebble
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite Pebble
Quartzite (SiO2-dominated rock)
metamorphic
Raw Agate (Rough Lake Superior Agate or Jasper-Chalcedony Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Yellow Quartz (Citrine Quartz / Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (Limonitic/Iron-stained)
Sandstone (containing Quartz, SiO2, and Limonite, FeO(OH)·nH2O)
sedimentary
Sandstone
Sandstone (SiO2 dominant)
sedimentary
Leopard Skin Jasper
Silicon Dioxide (SiO2) with mineral inclusions
mineral
Quartzite (with Mica / Quartzite Schist)
SiO2 (Silica) with minor Muscovite Mica KAl2(AlSi3O10)(OH)2
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Fossiliferous Limestone with Fossil Fragment
Fossiliferous Limestone (CaCO3 with organic remains)
fossil
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
K2 Jasper (K2 Granite)
Granite with Azurite inclusions (SiO2 + Cu3(CO3)2(OH)2)
igneous
Sandstone
Sandstone (SiO2 dominated)
sedimentary
Granite / Arkosic Sandstone (Coarse Igneous or Sedimentary Aggregate)
Granite / Quartz-Feldspar Aggregate
igneous
Unakite Jasper / Unakite
Altered Granite (containing Epidote, Orthoclase Feldspar, and Quartz)
metamorphic
Serpentine / Serpentinite
Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Sandstone (with iron staining)
Quartz Arenite / Ferruginous Sandstone
sedimentary
Orange Calcite
Calcite (CaCO3)
mineral
Pebble / Gravel Fragment
Clastic Rock Fragment
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Green Quartzite / Quartz Pebble
SiO2 (Silicon Dioxide with inclusions)
metamorphic
Polished granite pebble
Granite, commonly quartz–feldspar–mica aggregate
igneous
Tumbled greenstone/chlorite-rich pebble
Likely chlorite-rich greenschist or altered basalt; exact identification requires testing
metamorphic