Olivine (Peridot)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
mineral
Category
Man Made Object (Metal Alloy)
Browse man made object (metal alloy) specimens identified by the Rock Identifier community.
Learn about Man Made Object (Metal Alloy) in the encyclopedia
View all →
Fluorite
Calcium Fluoride (CaF2)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Magnetite / Iron Ore
Magnetite (Fe3O4)
mineral
Coal (Bituminous)
Sedimentary carbonaceous rock
sedimentary
Rhodonite
Rhodonite (MnSiO3)
mineral
Chert
Silicon dioxide (SiO2)
Sedimentary
Polished Ocean Jasper (orbicular jasper)
Siliceous microcrystalline quartz/chalcedony, mainly SiO₂, with iron- and manganese-rich inclusions
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Quartz with Mica/Host Rock
Silicon Dioxide (SiO2) with Phyllosilicates
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Serpentine
Antigorite/Chrysotile/Lizardite mixture (Mg,Fe)3Si2O5(OH)4
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni)3Si2O5(OH)4
metamorphic
Serpentinite
Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)
metamorphic
Quartz with Chalcopyrite (or Pyrite)
Silicon Dioxide (SiO2) with Copper Iron Sulfide (CuFeS2)
mineral
Limonite / Brown Iron Ore
Hydrous Iron Oxide (FeO(OH)·nH2O)
mineral
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Carnelian (Chalcedony variety)
SiO2 (Silicon Dioxide)
Mineral
Chevron Amethyst
Quartz (SiO2) with patterned Amethyst and White Quartz/Milky Quartz
mineral
Native Copper
Native Copper (Cu)
mineral
Basalt (Vesicular)
Basalt (Extrusive Igneous)
igneous
Fluorite
Calcium Fluoride (CaF2)
mineral
Red Jasper (with Quartz Veins)
Jasper (var. chert, SiO₂)
Sedimentary Rock (technically chert, a microcrystalline quartz)
Ironstone Concretion / Goethite-Hematite Nodule
Goethite/Hematite (α-FeO(OH) / Fe2O3)
sedimentary
White quartz pebble (likely milky quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Basalt (Vesicular)
Extrusive mafic igneous rock; primarily (Mg, Fe)2SiO4 (Olivine), CaAl2Si2O8 (Plagioclase Feldspar), and Pyroxene
igneous
Milky Quartz with inclusions
Silicon Dioxide (SiO2)
mineral
Scoria
Vesicular Basalt / Scoria
igneous
Blue calcite
Calcite (CaCO₃), likely blue variety
mineral
Diamond
Carbon (C)
gemstone
Iron Nodule
Iron-manganese concretion (Fe-Mn hydroxide)
sedimentary
Magnetite
Fe3O4 (Iron(II,III) oxide)
mineral
Fluorite (translucent octahedral crystal)
Calcium fluoride (CaF2)
mineral
Milky Quartz with Pyrite inclusions
Silicon Dioxide (SiO2) with Iron Disulfide (FeS2)
mineral
Ferrous Slag
Fused calcium-iron silicates (Industrial Slag)
Anthropogenic/Industrial byproduct
Tree Agate
Chalcedony (SiO2) with Dendritic inclusions
mineral
Pallasite Meteorite (Sliced and Polished)
Pallasite (Iron-Nickel Matrix with Olivine crystals)
mineral