Wonderstone (Sandstone)
Liesegang Banded Sandstone (SiO2 dominated)
sedimentary
Category
Man Made Rock (Sedimentary Analogue)
Browse man made rock (sedimentary analogue) specimens identified by the Rock Identifier community.
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Geode (partially formed/chalcedony with iron staining)
Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides
Mineral/Sedimentary Rock Feature
Slate
Foliated Metamorphic Rock (primarily composed of quartz, illite, and chlorite)
metamorphic
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata
sedimentary
Fossilized Oyster (Devil's Toenail)
Gryphaea (extinct genus of bivalve mollusks)
sedimentary
Graywacke (Sandstone)
Graywacke Sandstone
sedimentary
Chert (Yellow or Ochre Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper (Red Jasper with Quartz veins)
Jasper (Silicon Dioxide, SiO2)
sedimentary
Red Jasper
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
sedimentary
Chert (Jasper-bearing)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Iron-stained)
Chert (SiO2)
sedimentary
Chert (Brecciated or Veined)
Silicon Dioxide (SiO2)
sedimentary
Chert (Iron-rich or Jasperoid)
Cryptocrystalline Quartz (SiO2)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Septarian Nodule (Septarian Dragon Stone)
Septarian Concretion (CaCO3 + Al2Si2O5(OH)4)
sedimentary
Ammonite Fossil (Polished Half)
Ammonoidea (subclass)
sedimentary
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2)
mineral
Gneiss
Gneiss (quartz-feldspar-biotite gneiss)
metamorphic
Epidote (or Epidote-rich rock)
Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).
Mineral, often found in metamorphic rocks but also in sedimentary and igneous rocks
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Foliated Gneiss (River-Worn Pebble)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Milky Quartz (Crystal Cluster)
Silicon Dioxide (SiO2) - Quartz Variety
mineral
Chert (Green variety)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper (Iron-stained Quartz)
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Black Veined Jasper (Spiderweb Jasper)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (with Iron Oxide)
Arenite with Limonite/Hematite staining
sedimentary
Chert (Flint variety)
Chert (SiO2)
sedimentary
Honeycomb Coral Fossil
Favosites (extinct genus of tabulate coral)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Almandine Garnet in Matrix
Almandine (Fe3Al2(SiO4)3)
metamorphic
Pink Gneiss / Pink Granite Gneiss
Felsic Gneiss (dominated by Orthoclase Feldspar and Quartz)
metamorphic
Ferruginous Sandstone (Gritstone)
Clastic sedimentary rock with iron-rich cement (FeO(OH)·nH2O)
sedimentary
Quartz (Milky or Clear variety)
Silicon Dioxide (SiO2)
mineral
Chert (variously identified as Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper Agate (specifically Brecciated Jasper with Agate inclusions)
Silicon Dioxide (SiO2)
mineral
Ferruginous Chert
Microcrystalline Quartz (SiO2) with Iron Oxides
sedimentary
Ironstone Concretion / Limonite-stained Siltstone
Ironstone (primarily Limonite FeO(OH)·nH2O and Siltstone)
sedimentary
Yellow Agate
Chalcedony (cryptocrystalline Quartz), SiO2
mineral
Chalcedony (Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral