Greenstone
Metabasalt / Greenschist facies rock
metamorphic
Category
Biogenic Material
Browse biogenic material specimens identified by the Rock Identifier community.
Learn about Biogenic Material in the encyclopedia
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Chert (Tan/Brown)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Chert (specifically Flint or Common Opal variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Iron Ore (Hematite/Goethite)
Ironstone (Fe2O3 / FeO(OH))
sedimentary
Plum Blossom Tourmaline
Tourmaline with Lepidolite (Na,Ca)(Li,Mg,Al)3Al6(BO3)3Si6O18(OH)4
igneous
Amber
Succinite (fossilized resin, C10H16O)
mineral
Chert / Flint
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Commonly known as Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Common Chert Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Granite Pebble
Granite; primarily composed of Quartz (SiO2), Feldspar (KAlSi3O8), and Mica
igneous
Chert (Flint)
Chert (SiO2)
sedimentary
Chert (Chert Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Common Opal/Agate mixture)
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline silica (SiO2)
sedimentary
Crackled Quartz (Dyed)
Silicon Dioxide (SiO2)
mineral
Slate
Slate
metamorphic
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO2)
mineral
Flint (Chert)
Silicon Dioxide (SiO2)
sedimentary
Weathered basalt or other dark volcanic rock
Likely basalt; predominantly plagioclase feldspar and pyroxene, possibly olivine and iron oxides
igneous
Polished Unakite (likely)
Unakite: quartz + epidote + pink K-feldspar, commonly with minor chlorite
metamorphic
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Diamond
Native Carbon (C)
gemstone
Conglomerate
Conglomerate (Sedimentary Clastic Rock)
sedimentary
Diamond (Faceted)
Carbon (C)
gemstone
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Heat-Treated Citrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Quartz / Limestone Gravel
SiO2 (Silicon Dioxide) and CaCO3 (Calcium Carbonate)
igneous and sedimentary mixture
Dalmatian Jasper
Dalmatian Stone (a microcrystalline quartz and feldspar rock with arfvedsonite)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt containing Zeolite or Quartz (SiO2/Silicates)
igneous
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Polished blue sodalite cabochons
Sodalite, Na₈Al₆Si₆O₂₄Cl₂
mineral
Chert (varietal: Jasper or Ironstone nodule)
Microcrystalline Quartz (SiO2) with iron oxides
sedimentary
Polished ocean jasper / brecciated jasper
Jasper, microcrystalline quartz (SiO₂), with iron-oxide and other silicate inclusions
mineral
Granite
Intrusive Igneous Rock
igneous
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Slate
Metamorphic Rock (Fine-grained)
metamorphic
Chert
Microcrystalline quartz (SiO2)
sedimentary