Chert (variously known as Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Mineral Within Sedimentary Rock
Browse mineral within sedimentary rock specimens identified by the Rock Identifier community.
Quartzite
Quartzite (primarily SiO2)
metamorphic
Red Jasper
Jasper (Silicon Dioxide) - SiO2
sedimentary/mineral
Gneiss
High-grade regional metamorphic rock (Foliated)
metamorphic
Red Sandstone
Arenite (primarily SiO2 with hematite/iron oxide coating)
sedimentary
River Jasper (Chert/Chalcedony mix)
Silicon Dioxide (SiO2) with iron oxide and chlorite inclusions
sedimentary
Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2 - Muscovite component)
metamorphic
Green Quartzite (with Fuchsite)
Quartzite with Muscovite variety Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Chert
Silicon dioxide (SiO2)
Sedimentary
Belemnoit (Fossil)
Belemnoidea (Order), Rostrum / Guard
sedimentary
Fossil Coral (Rugose Coral Fragment)
Rugosa (extinct order of solitary and colonial corals)
sedimentary
Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)
Quartz (SiO₂)
Mineral
Rutilated Quartz
Quartz (SiO2) with Rutile (TiO2) inclusions
Mineral
Chert (Commonly known as Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Limonite inclusions
sedimentary
Peridotite (Olivine)
Peridotite (comprising (Mg,Fe)2SiO4)
igneous
Ironstone (likely Limonite or Goethite)
Ferruginous sedimentary rock (FeO(OH)·nH2O)
sedimentary
Gneiss
Gneiss
metamorphic
Unakite
Epidotized Granite
metamorphic
Grey Limestone Pebble
Limestone (Calcium Carbonate - CaCO3)
sedimentary
Granitic Sand
Detrital sediment (predominantly Quartz, Feldspar, and Mica)
sedimentary
Quartzite with inclusions
Quartzite (primarily SiO2)
metamorphic
Gneiss (specifically a Granitic Gneiss)
Gneiss (typically composed of Quartz, Feldspar, and Mica/Amphiboles)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in a Geode body
sedimentary or igneous (host environment)
Chert (specifically Banded Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Fossilized Gastropod (Snail)
Class Gastropoda (internal mold or 'steinkern')
sedimentary
Black Veined Jasper (Spiderweb Jasper)
Silicon Dioxide (SiO2)
sedimentary
Desert Rose
Gypsum (CaSO4·2H2O) or Baryte (BaSO4) with trapped sand grains
mineral
Granitoid (Granitic Rock)
Granitoid (Quartzo-feldspathic plutonic rock)
igneous
Gneiss (specifically Banded Gneiss)
Gneiss
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Fossilized Sand Tiger Shark Tooth
Carcharias taurus / Striatolamia macrota (mineralized as Hydroxylapatite/Francolite)
sedimentary (fossil)
Indigo Gabbro
Gabbro (Mafic Intrusive Rock)
igneous
Chert (and/or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead)
Chert (primarily Microcrystalline Silica, SiO2)
sedimentary
River Cobble (Quartzite-rich Sandstone)
Clastic Sedimentary Rock (Litharenite/Quartzite transition)
sedimentary
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Red Howlite (Dyed)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5) with Red Dye
mineral