Grey Slate
Foliated Metamorphic Rock (formed by low-grade regional metamorphism of shale or mudstone)
metamorphic
Category
Sedimentary (Processed Mineral Product)
Browse sedimentary (processed mineral product) specimens identified by the Rock Identifier community.
Learn about Sedimentary (Processed Mineral Product) in the encyclopedia
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Hematite
Hematite (Fe2O3)
mineral
Banded Gneiss
Gneiss (Metamorphic high-grade rock)
metamorphic
Fossil Bivalve Shell
Class Bivalvia (e.g., Veneriidae family)
sedimentary
River Rock (likely Gneiss or Quartzite)
Metamorphic rock specimen (potentially Foliated Gneiss)
metamorphic
Red Jasper (Opaque Chalcedony)
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
mineral
Jasper (likely a variety of Brecciated Jasper or a patterned variety)
Silicon dioxide (SiO2)
Mineral
Pink Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Jasper
Chalcedony (cryptocrystalline quartz), SiO2
Sedimentary
Banded Chert (Jasper) River Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Riverstone Jasper (Chert variant)
Silicon Dioxide (SiO2) with impurities
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Banded Chert (Agate)
Silicon Dioxide (SiO2)
sedimentary
Chevron Amethyst
Quartz (SiO2) with patterned Amethyst and White Quartz/Milky Quartz
mineral
Conglomerate
Conglomerate (a clastic sedimentary rock)
Sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcendony replacing organic matter)
sedimentary
Silicon
Element Si
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Kidney Stone
Nephrolith (typically Calcium Oxalate - CaC2O4)
mineral
Jasper Agate (Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Jasper (Silicified microcrystalline quartz) - SiO2
sedimentary
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Man-made Synthetic Material (Costume Faux Fur)
Synthetic Polymer (Polyester/Acrylic)
not a rock
Fordite
Anthropogenic paint-rock
mineraloid (human-made geological specimen)
Fancy Jasper
Chalcedony (cryptocrystalline quartz) with inclusions
Mineral
Graphite
Graphite (Carbon, C)
metamorphic
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Carnelian (a variety of Chalcedony)
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Chert (Flint)
Chert (SiO2)
sedimentary
Trilobite Fossil (Flexicalymene)
Flexicalymene ouzregui
sedimentary
Quartz
Quartz (SiO₂)
Mineral
Kidney Stone
Nephrolithiasis (Calcium Oxalate, Hydroxyapatite, or Uric Acid)
mineral
Ferruginous Quartz (Hematoid Quartz)
Silicon Dioxide (SiO2) with Hematite or Goethite inclusions
mineral
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
sedimentary
Kidney Stone
Calcium Oxalate (CaC2O4·nH2O)
mineral
Dyed Crackle Quartz (Green)
Quenching-treated Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper (River Polished)
Jasper (Silicon Dioxide, SiO2)
sedimentary/mineral
Snakeskin Jasper
Microcrystalline Quartz (SiO2) with iron inclusions
sedimentary
Ferromanganese Nodule
Polymetallic Nodule (composed primarily of MnO2 and Fe2O3)
sedimentary
River Stone (likely Siltstone or fine-grained Quartzite)
Sedimentary clastic rock containing SiO2 and iron oxides
sedimentary