Quartz Geode
Silicon Dioxide (SiO2)
Mineral/Sedimentary
Category
Man Made Rock (Sedimentary Analogue)
Browse man made rock (sedimentary analogue) specimens identified by the Rock Identifier community.
Quartz / Common Opal Transition
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite (with Iron Oxide cement)
sedimentary
River Rock (Mossy)
Stream-rounded Clast (likely Siltstone or Sandstone with bryophytes)
sedimentary
Chert (Quartz Variety)
Microcrystalline / Cryptocrystalline Quartz (SiO2)
sedimentary
Limestone (specifically Dolomitic Limestone)
Calcium Magnesium Carbonate (CaMg(CO3)2)
sedimentary
Limestone with Quartz/Calcite Veins
Sedimentary Limestone (CaCO3 with SiO2 or CaCO3 intrusions)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Bauxite
Bauxite (Al2O3·2H2O)
sedimentary
Chert / Flint Nodules in Limestone
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Feldspar-rich Quartzite
Meta-arkose (Quartz-Feldspar Quartzite)
metamorphic
Agate
Agate (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)
sedimentary
Graywacke
Lithic Sandstone (Graywacke)
sedimentary
Sandstone Concretion
Moqui Marble / Iron-oxide Concretion (SiO2 with Hematite/Goethite)
sedimentary
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
Jasper (specifically Bloodstone or Heliotrope variety)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary (chemically precipitated)
Dark Igneous Rock (Likely Basalt or Diabase)
Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.
Igneous
Sandstone
Arenite
sedimentary
Green Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartz-veined Siltstone
Siltstone with Quartz (SiO2) veins
sedimentary
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Quartzite / Sandstone / Chert Mix
Silicon Dioxide (SiO2)
sedimentary and metamorphic
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Banded Agate
Sedimentary Cryptocrystalline Quartz (SiO2)
mineral
Jasper (specifically Bloodstone or Heliotrope variety)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Red Jasper (possibly with Agate inclusions)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Jasper (with Agate/Chalcedony inclusions)
Silicon Dioxide (SiO2)
sedimentary
Tree Agate
Silicon Dioxide (SiO2) - Dendritic Agate/Chalcedony
sedimentary
Jasper
Silicon dioxide / Chalcedony (SiO2)
Sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium) CuAl6(PO4)4(OH)8·4H2O
mineral
Sedimentary Breccia
Clastic Breccia (CaCO3/SiO2 matrix)
sedimentary
Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
River Stone (Quartzite/Siltstone mixture)
Silicon Dioxide (SiO2) based metamorphosed sandstone
metamorphic or sedimentary