Diamond
Diamond (C)
mineral
Category
Industrial Byproduct (Anthropogenic Rock)
Browse industrial byproduct (anthropogenic rock) specimens identified by the Rock Identifier community.
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Chalcedony (Common Opal variant)
Silicon dioxide (SiO2) with varying levels of hydration
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Diamond (or Cubic Zirconia)
Crystallized Carbon (C) for Diamond; Zirconium Dioxide (ZrO2) for CZ
mineral
Clear Quartz (Herkimer Diamond variant)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral
Peridot
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
Mineral
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Vesicular Basalt with Epidote
Vesicular Basalt (Mg, Fe)2SiO4 with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
igneous
Red Garnet (Almandine-Pyrope series)
Garnet Group, Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)
mineral
Basalt with Quartz/Calcite Veins
Basalt with hydrothermal vein infill
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Coal
Bituminous or sub-bituminous coal (carbonaceous rock)
sedimentary
Fossiliferous Limestone
Bioclastic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Gneiss
Gneiss
metamorphic
Gabbro (or Basalt Pebble)
Mafic Intrusive/Extrusive Igneous Rock
igneous
Basalt
Basalt
igneous
Sandstone or Quartzite
Arenite (if sedimentary) / Quartzite (if metamorphic)
Sedimentary or Metamorphic
Sandstone (Glacial Cobble)
Arenite / Sedimentary Rock (primarily SiO2)
sedimentary
Quartzite Cobble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Fish Fossil in Limestone
Lycoptera (likely) in Micritic Limestone
sedimentary
Quartz Geode
Silicon dioxide (SiO2)
sedimentary
Ulexite
NaCaB5O6(OH)6·5H2O
mineral
Basalt
Extrusive Igneous Rock
igneous
Pink Granite
Phaneritic Quartz-Feldspar Plutonic Rock
igneous
Shale
Shale (clastic sedimentary rock composed of silt and clay-sized particles)
sedimentary
Dalmatian Jasper / Dalmatian Stone
Peralkaline Rock (Silicon Dioxide with Amphibole inclusions)
igneous
Shale
Fissile mudstone (Shale)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4
metamorphic
Sandstone (Ferruginous)
Arenite with Iron Oxide (Limonite/Hematite) coating
sedimentary
Granite with Cupules / Bedrock Mortars
Granite (felsic intrusive plutonic rock)
igneous
Quartz (milky quartz variety)
Quartz (SiO₂)
Mineral
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Quartz Druzy (on Matrix)
Silicon Dioxide (SiO2)
mineral
Scoria
Scoria
Igneous
Basalt with Quartz Vein
Extrusive Igneous Rock / Volcanic Rock
igneous
Red jasper in gray host rock (likely hematite-stained quartzite or rhyolite)
Jasper: microcrystalline quartz (SiO₂), with iron-oxide coloration; exact host uncertain from image
mineral
Rounded quartz-rich pebble
Chert or quartzite pebble (tentative; mostly microcrystalline quartz, SiO₂)
sedimentary