Slate
Slate (Low-grade foliated metamorphic rock)
metamorphic
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
Browse industrial byproduct (anthropogenic rock like material) specimens identified by the Rock Identifier community.
Learn about Industrial Byproduct (Anthropogenic Rock Like Material) in the encyclopedia
View all →
Chert (Green variety)
Microcrystalline Quartz (SiO2)
sedimentary
Sedimentary Rock with Crafts (Pet Rock)
Sedimentary rock decorated with synthetic materials
sedimentary
Diabase
Diabase (also known as Dolerite)
igneous
Green Apophyllite and Stilbite on Quartz Cluster
Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)
Mineral
Chert (Jasper/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Vesicular Basalt (Lava Rock)
Basalt (Vesicular Variety)
igneous
Rose quartz heart
Quartz, silicon dioxide (SiO₂), pink variety
mineral
Green Slate (Greenstone)
Foliated Metamorphic Rock (rich in Chlorite/Epidote)
metamorphic
Petrified Wood (Black / Carbonized)
Silicon Dioxide (Quartz/Chalcedony replacing Organic Matter)
fossil
Sandstone
Arenite (primarily SiO2)
sedimentary
Basalt
Vesicular Basalt
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
sedimentary
Vesicular basalt (scoria-like volcanic rock)
Vesicular basalt; commonly composed of plagioclase, pyroxene, olivine, and volcanic glass
igneous
Granite Gravel / Crushed Granite
Plutonic Felsic Igneous Rock
igneous
Sandstone with Calcite Vein
Clastic sedimentary rock (primarily SiO2) with Calcium Carbonate (CaCO3) infilling
sedimentary
Quartz-rich gravel fragment
Quartz (silicon dioxide, SiO₂), possibly with feldspar or carbonate inclusions
mineral
Chert (Jasper/Flint variety)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2, silica)
sedimentary
Sandstone with Ironstone Concretion
Arenite with Ferruginous Cement
sedimentary
Basalt
Mafic volcanic rock (dominated by Plagioclase and Pyroxene)
igneous
Fossiliferous Rock (likely Dinosaur Fossil in Matrix)
Permineralized Vertebrate Fossil (Calcium Carbonate/Silica replaced bone material)
sedimentary
Sandstone (Pebble/Cobble)
Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)
Sedimentary
Polished orbicular jasper / brecciated jasper
Jasper, microcrystalline quartz (SiO₂), with iron-oxide and clay-rich inclusions
sedimentary
Limestone
Sedimentary rock composed primarily of Calcium Carbonate (CaCO3)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Man-made Jewelry (Metal and Glass/Plastic)
Synthetic Alloy and Amorphous Solid (SiO2/Polymer)
not a rock
Siltstone
Siltstone (fined-grained clastic sedimentary rock)
sedimentary
Beach Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Diamond (or Cubic Zirconia / Gemstone Ring)
C (Carbon) for natural Diamond
gemstone
Brecciated jasper/chert
Microcrystalline quartz (SiO₂), with iron-oxide and clay inclusions
sedimentary
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Red Jasper (Opaque Chalcedony)
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
mineral
Pegmatite
Igneous Pegmatite
igneous
Banded Chert in Matrix
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint when dark)
Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
sedimentary
Chert (Iron-rich or Jasperoid)
Cryptocrystalline Quartz (SiO2)
sedimentary
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral