Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Category
Man Made Rock Like Material
Browse man made rock like material specimens identified by the Rock Identifier community.
Vesicular Basalt
Basalt with secondary mineral infilling (Amygdaloidal Basalt)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt
Mafic Volcanic Rock (Primarily Plagioclase and Pyroxene)
Igneous
Shale or Siltstone
Sedimentary Rock (Siliciclastic)
sedimentary
River Stone (likely Siltstone or fine-grained Sandstone)
Clastic Sedimentary Rock (Lithic Wacke / Siltstone)
sedimentary
Petoskey Stone (Petrified Favosites)
Favosites (extinct colonial coral), CaCO3 with Silica replacement
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Limestone Pebble
Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
metamorphic
Chert (specifically Flint or Common Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Basalt
Extrusive mafic igneous rock
igneous
Mica Schist
Schist (Crystalline metamorphic rock)
metamorphic
Chert (variations include Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Snowflake Obsidian
Volcanic glass (SiO2) with Cristobalite (SiO2) inclusions
igneous
Serpentinite
Serpentinite (group of hydrous magnesium iron phyllosilicates)
metamorphic
Obsidian (Black Obsidian)
Amorphous volcanic glass (primarily SiO2)
igneous
Chert or Flint (polished/water-worn)
Chert (a microcrystalline or cryptocrystalline variety of quartz, SiO2). Flint is a specific variety of chert.
Sedimentary (most likely, as Chert is a sedimentary rock often found as nodules in limestone or as bedded deposits; however, it can also form by metasomatic replacement, which leans towards metamorphic processes under certain conditions)
Blue Quartzite
Quartzite (primarily SiO2) with inclusions like Dumortierite or Crocidolite
metamorphic
Ferruginous Chert
Silicon dioxide with iron oxide impurities (SiO2 + Fe2O3)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Petrified Wood (Agatized/Silicified Wood)
Silicified Wood / Chalcedony (SiO2)
sedimentary
Olivine (often within Peridotite)
Magnesium iron silicate, (Mg,Fe)2SiO4
mineral
Sodalite (blue beads) and Clear Quartz (clear beads)
Sodalite: Na4Al3Si3O12Cl; Quartz: SiO2
mineral
Chert (Jasper type)
Microcrystalline Quartz (SiO2)
sedimentary
Serpentinite
Serpentinite (composed primarily of mineral group (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4)
metamorphic
Basalt River Stone
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Chert (variations include Flint/Jasper)
Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Sandstone (with Iron Siderite Concretion)
Arenite with Ironstone Concretion (FeCO3)
sedimentary
Sandstone (likely Iron-rich or Arkosic)
Arenite (SiO2 with FeO(OH) or Fe2O3 staining)
sedimentary
Slag
Ferrous slag (by-product of iron smelting)
Mineraloid / Anthropogenic
Quartz-veined Schist (or Metasandstone)
Metamorphic Rock with Quartz Veining (SiO2)
metamorphic
Rough Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Basalt
Extrusive mafic igneous rock
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)
Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)
Metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous
Smoky Quartz on Feldspar (Granite Pegmatite)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)
igneous
Amphibolite
Amphibolite
metamorphic
Ironstone Concretion (Moqui Marble)
Iron-oxide Concretion (Hydrated ferric oxide, Fe2O3·nH2O)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Ferruginous Quartz (Iron-stained Quartzite)
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
metamorphic