Red Howlite (Dyed)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5) with Red Dye
mineral
Category
Sedimentary (Chemical)
Browse sedimentary (chemical) specimens identified by the Rock Identifier community.
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Quartzite and Chert
Silicon Dioxide (SiO2)
metamorphic and sedimentary
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Aragonite Star Cluster
Aragonite (Calcium Carbonate - CaCO3)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
Mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Banded Iron Formation (BIF) with Quartz
Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)
Sedimentary
Jasper and Basalt Mix (Dark Chert/Basalt River Pebble)
Silicon Dioxide (SiO2) or Mafic extrusive igneous rock
sedimentary or igneous
Magnetite / Iron-Rich Concretion
Magnetite (Fe3O4) or Bog Iron Limonite
mineral
Dyed Blue Agate
Silicon Dioxide (SiO2)
Mineral
Quartz River Pebbles
Silicon Dioxide (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Concrete
Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)
sedimentary (artificial)
Amber
Succinite (a Fossilized Tree Resin); Chemical formula is approximately C10H16O
Organic mineraloid
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Azurite in Gossan
Azurite (Cu3(CO3)2(OH)2) in Limonite/Goethite matrix
mineral
Banded Agate (Onyx variety)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Celestite (Celestine)
Strontium Sulfate (SrSO4)
mineral
Slate
Slate (Metamorphic Rock)
metamorphic
Greywacke (likely)
Greywacke (a type of sandstone)
Sedimentary
Fossiliferous Limestone
Sedimentary rock containing Indeterminate Fossil remains (likely Crinoid stem or Bryozoan fragment)
fossil
Agate (Dyed High-Grade Polished Slice)
Silicon dioxide (SiO2), Chalcedony crystal variety
mineral
Aragonite Star Cluster (or Aragonite Sputnik)
Aragonite (Orthorhombic Calcium Carbonate, CaCO3)
mineral
Concrete with Exposed Aggregate
Anthropogenic conglomerate (Concrete)
man-made rock (sedimentary analogue)
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartzite
Quartzite (mostly SiO2)
Metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Limonite-stained Quartz / Quartzite
Silicon Dioxide (SiO2) with iron hydroxides (FeO(OH)·nH2O)
sedimentary or metamorphic
Azurite Malachite
Azurite (Cu3(CO3)2(OH)2) and Malachite (Cu2CO3(OH)2)
mineral
Banded Agate (specifically Sardonyx)
Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz
mineral
Pyrite (Pseudomorph)
Iron Sulfide (FeS2)
mineral
Sulfur
Native Sulfur (S8)
mineral
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Greenstone
Metamorphosed Mafic Igneous Rock
metamorphic
Milky Quartz Chip
Silicon Dioxide (SiO2)
mineral
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Acicular Azurite (indicated by deep blue, fibrous/fuzzy appearance)
Azurite (Copper Carbonate Hydroxide) - Cu3(CO3)2(OH)2
mineral
Flint
Chert (a form of cryptocrystalline quartz, chemical formula SiO₂)
Mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite (River Cobble)
Quartzite (predominantly SiO2)
metamorphic