Siltstone
Siltstone (composed of clastic quartz and feldspar)
sedimentary
Category
Anthropogenic Specimen (Man Made Material)
Browse anthropogenic specimen (man made material) specimens identified by the Rock Identifier community.
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Bauxite
Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)
sedimentary
Chert (specifically Red Chert/Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Vesicular Basalt
Mafic Volcanic Rock (Basalt)
igneous
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Granite
Granite (Felsic intrusive igneous rock)
igneous
Pumice
Pumice (a highly vesicular volcanic rock)
igneous
Chert (specifically Gray Chert)
Silicon Dioxide (SiO2)
sedimentary
Crushed Stone (Likely Granite or Diabase)
Intrusive Igneous Rock (Granitoid/Gabbroid)
igneous
Vesicular Basalt (Iron-rich)
Scoriaceous Basalt / Oxidized Vesicular Basalt
igneous
Chert (specifically Jasper)
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Sandstone (likely Siltstone or fine-grained Sandstone)
Sedimentary Rock (Clastic)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Limestone
Calcareous sedimentary rock (primarily Calcium Carbonate, CaCO3)
sedimentary
Chert (specifically Yellow or River Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Clear Quartz crystals on a Matrix base (Geode fragment)
Silicon Dioxide (SiO2)
mineral
Kyanite
Kyanite (Al2SiO5)
mineral
Fire Opal (in matrix)
Hydrated Silica (SiO2·nH2O)
Mineraloid
Olivine (Peridotite)
Magnesium iron silicate (Mg, Fe)2SiO4
igneous
Jasper (Green/Yellow Moss Jasper)
Silicon Dioxide (SiO2)
mineral
Chert (and Jasper blend)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Corundum
Corundum (Aluminium oxide, Al2O3)
mineral
Limonite (Iron Ore Congcretion)
Limonite (a mixture of hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)
mineral
Jasper and Chert Conglomerate
Ferruginous Microcrystalline Quartz (SiO2)
sedimentary
Shale
Laminated Mudstone
sedimentary
Fossiliferous Limestone
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Snowflake Obsidian
Vitreous volcanic silicate (SiO2 with Cristobalite inclusions)
Igneous
Sandstone
Sandstone (Sedimentary rock composed of silicate grains)
sedimentary
Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)
mineral
Diamond (in Matrix)
Carbon (C)
mineral
Rhodonite
Rhodonite (MnSiO3)
mineral
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Amethyst Geode (Thunderegg)
Silicon Dioxide (SiO2) - Quartz Variety: Amethyst
mineral
Shungite
Non-crystalline carbon (allotrope of carbon)
metamorphic
Unknown Organic Object (likely a berry or fruit)
Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.
Organic Material (likely a fruit or berry)
Chert / Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Green Slag Glass (Cullet)
Amorphous Silica (Industrial Glass Byproduct)
Synthetic/Byproduct (Non-igneous, non-sedimentary, non-metamorphic)