Sandstone
Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)
Sedimentary Rock
Category
Man Made Rock (Sedimentary Analogue)
Browse man made rock (sedimentary analogue) specimens identified by the Rock Identifier community.
Banded Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Goniatite Fossil
Goniatitida (Order), fossilized in limestone/calcite (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Septarian Nodule Segment (Commonly known as Dragon Stone or Lightning Stone)
Septarian Nodule (CaCO3 / Hydrated Calcium Carbonate)
sedimentary
Dalmatian Jasper (or Dalmatian Stone)
Dalmatian Stone (A peralkaline felsite composed of feldspar, quartz, and sodic amphibole)
igneous
White Opal (Common)
Hydrated Silica (SiO2·nH2O)
mineral
Fluorite (likely Green Fluorite variant)
Calcium Fluoride (CaF2)
mineral
Quartz (Milk Quartz / Massive Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite with Chert inclusions
Metamorphosed Quartz-rich Rock (SiO2)
metamorphic
Wishing Rock (Quartz Vein in Host Rock)
Silicon dioxide (SiO2) vein in various host rocks
Igneous/Sedimentary/Metamorphic with Mineral Vein
Druzy Quartz on Agate/Chert
Silicon Dioxide (SiO2)
mineral
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone with Vitrinite/Coal inclusions
Arenite with Carbonaceous inclusions
sedimentary
Sandstone (Wonderstone)
Silicified Sandstone / Orthoquartzite with Liesegang rings
sedimentary
Bloodstone
Heliotrope (cryptocrystalline Quartz, SiO2 with inclusions of Hematite)
sedimentary
Red Sandstone
Sandstone (mainly SiO2 with Iron Oxide cement)
sedimentary
Sandstone (specifically Picture Sandstone or Wonderstone)
Arenite (composed primarily of SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Gneiss (Granite Gneiss)
Gneiss
metamorphic
Schist with Biotite Inclusion
Biotite-bearing Mica Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Biotite Schist
Biotite-rich Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic
Quartzite (River Pebble)
Metamorphosed Sandstone (SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
mineral
Red Jasper
Jasper (SiO2) with Hematite (Fe2O3) inclusions
sedimentary (microcrystalline quartz)
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone
Limestone (CaCO3 with Bioclasts)
sedimentary
Yellow Chert (Gold-toned Jasper)
Silicon Dioxide (SiO2)
sedimentary
Bauxite
Bauxite (Al(OH)3 mixed with Fe2O3 and clay minerals)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Ferruginous Sandstone (Iron-rich Sandstone)
Ferruginous Arenite
sedimentary
Conglomerate (River Rock Aggregate)
Conglomerate (Lithic-clast conglomerate)
sedimentary
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Brecciated River Cobble)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Ironstone variety)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
River Siltstone / Mudstone Pebble
Siltstone (composed of mixed silicate and carbonate minerals)
sedimentary
Quartz (likely tumbled or naturally water-worn)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite or Limonite inclusions
sedimentary
Geode (Unopened)
Silica-lined Vug (primarily SiO2)
sedimentary
Quartz (Milky/Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Gneiss with Orthoclase Feldspar
Gneissic Metamorphic Rock with K-Feldspar inclusions
metamorphic
Gneiss (specifically Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic