Sugilite
Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)
mineral
Category
Man Made Material (Simulated Mineral)
Browse man made material (simulated mineral) specimens identified by the Rock Identifier community.
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Milky and Ferruginous Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz Cobble
Quartz (Silicon Dioxide, SiO2)
mineral
Unidentified coarse-grained rock fragments
Likely granite or granitic rock; exact identification is uncertain from the photograph
igneous
Obsidian
Volcanic Glass
igneous
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
Mineral
Weathered agate or chalcedony nodule
Microcrystalline quartz (SiO₂), likely agate/chalcedony with iron-oxide staining
mineral
Small polished dark mineral or gemstone fragment
Indeterminate; possibly smoky quartz, obsidian, or dark tourmaline
mineral
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Chiastolite (Andalusite)
Al2SiO5
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Fordite
Anthropogenic paint-rock
mineraloid (human-made geological specimen)
Actinolite (likely fibrous amphibole)
Actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂; possibly an actinolite–tremolite specimen
mineral
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Obsidian
Volcanic Glass (SiO2)
igneous
Slate
Slate (foliated metamorphic rock)
metamorphic
Greenstone
Metabasalt / Greenschist facies rock
metamorphic
Plum Blossom Tourmaline
Tourmaline with Lepidolite (Na,Ca)(Li,Mg,Al)3Al6(BO3)3Si6O18(OH)4
igneous
Zebra Jasper
Tetragonal Silicon Dioxide (Quartz) with impurities
sedimentary
Garnet-bearing metamorphic rock, likely mica schist
Biotite–garnet schist; commonly includes quartz, feldspar, biotite, and almandine garnet
metamorphic
Sandstone with Vitrinite/Coal inclusions
Arenite with Carbonaceous inclusions
sedimentary
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2
Mineral
Fossilized Bone / Dinosaur Fossil
Fossilized vertebrate bone (permineralized)
fossil
Fossilized Bivalve Shell
Bivalvia (Phylum Mollusca)
fossil
Polished malachite tower
Malachite, Cu₂CO₃(OH)₂ (basic copper carbonate)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Sandstone (Quartz-rich sedimentary rock)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Weathered iron-rich rock, possibly laterite or limonite-bearing stone
Hydrated iron oxides/hydroxides, chiefly limonite-goethite mixture; exact identification requires testing
mineral
Dendritic Agate (Tree Agate)
Chalcedony (Silicon Dioxide, SiO2) with Manganese or Iron Oxide inclusions
mineral
Tree Agate (or Moss Agate)
Dendritic Agate (Silicon Dioxide - SiO2)
mineral
Tumbled dark green stone, likely serpentine or greenstone
Serpentinite (hydrated magnesium silicate minerals, chiefly antigorite/lizardite); possible chlorite-rich greenstone
metamorphic
Granite Pebble
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Green Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Green-and-white quartz-rich rock, likely chrysoprase or serpentine-bearing stone
Uncertain; possible chrysoprase (microcrystalline quartz, SiO₂) or serpentinite (magnesium silicate minerals)
mineral
Sandstone / Limestone
Sedimentary Rock (Quartz Sandstone or Calcareous Grainstone)
sedimentary