Granite
Felsic intrusive igneous rock
igneous
Community gallery
All rocks & minerals
Every specimen the Rock Identifier community has discovered, from desert agates to deep-sea basalts.
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Granite
Granite (Alkali-feldspar granite)
igneous
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Red Jasper
Silicon Dioxide (SiO2) containing Iron Oxide inclusions
sedimentary
Arsenopyrite in Sulphide Ore
Arsenopyrite (FeAsS)
mineral
Red Feldspar (Orthoclase)
Orthoclase Feldspar (KAlSi3O8)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Pyritic Mudstone
Argillaceous rock (FeS2)
sedimentary
Green Slate (Greenstone)
Foliated Metamorphic Rock (rich in Chlorite/Epidote)
metamorphic
Tiger's Eye
Silicified Crocidolite (Silicon Dioxide - SiO2)
metamorphic
Glauconite (Greensand)
Glauconite (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
sedimentary
Gold Ore in Quartz
Native Gold (Au) in Quartz (SiO2) matrix
mineral
Greenstone
Greenschist (composed of chlorite, actinolite, and epidote)
metamorphic
Basalt River Pebble
Basalt
igneous
Basalt (River Pebble)
Extrusive mafic igneous rock
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Fuchsite
Cr-bearing Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Pyrite in Matrix
Iron Disulfide (FeS2)
mineral
Aventurine Quartz
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Jadeite
Jadeite (NaAlSi2O6)
metamorphic
Sulfur on matrix
Native Sulfur (S8)
mineral
River Pebble (likely Quartzite or Quartz)
Quartzite (SiO2)
metamorphic
Tektite
Tektite (high-silica natural glass)
Mineraloid
Quartzite
Quartzite (SiO2)
metamorphic
Pink Granite
Granite (Phaneritic Acidic Igneous Rock)
igneous
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Chert (Green variety)
Silicon Dioxide (SiO2)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Green Opal
Opal (Hydrated silica, SiO2·nH2O)
mineral
Chert (specifically Green Chert/Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Obsidian
Volcanic Glass (SiO2)
igneous
Dyed Blue Agate (Dragon Vein Agate)
Silicon Dioxide (SiO2) with artificial cobalt/organic dyes
mineral
Boulder Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Granodiorite
Phaneritic intrusive igneous rock (intermediate composition)
igneous
Scoria
Scoriaceous Basalt
igneous
Basalt
Basalt
igneous