Olivine/Peridot
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Category
Man Made Material (Jewelry, Metal Alloy)
Browse man made material (jewelry, metal alloy) specimens identified by the Rock Identifier community.
Learn about Man Made Material (Jewelry, Metal Alloy) in the encyclopedia
View all →
Honeycomb Coral Fossil (Favosites)
Favosites alpenensis
sedimentary
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or White Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Diamond (set in a gold ring)
Carbon (C) - Adamantine cubic carbon
mineral
Likely quartz-rich mineral fragment
Quartz (SiO₂), possibly iron-stained or included quartz
mineral
Polished dark green stone, likely nephrite jade or serpentine
Nephrite jade: tremolite–actinolite amphibole, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂; possible serpentine: Mg₃Si₂O₅(OH)₄
metamorphic
Tumbled carnelian agate (probable)
Cryptocrystalline quartz, SiO₂; chalcedony variety colored by iron oxides
gemstone
Unakite
Altered Granite (Epidote, Pink Orthoclase Feldspar, and Quartz)
metamorphic
Moldavite
Moldavite (Silica-rich glass, SiO2 + Al2O3)
tektite
Citrine
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Pyrite
Iron Disulfide (FeS2)
mineral
Cubic Zirconia (Set in Jewelry)
Zirconium Dioxide (ZrO2)
gemstone
Fossilized Shark Tooth (Otodus)
Otodus obliquus
fossil
Petrified Wood
Silicified Wood (Permineralized Lycopsid, Conifer, or Hardwood)
fossil
Coral Fossil (Scleractinia)
Scleractinia (Order), primarily CaCO3 (Aragonite or Calcite)
sedimentary
Carnelian (Polished Agate/Jasper)
SiO2 (Silicon Dioxide - Microcrystalline Quartz)
mineral
Black Flint
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Serpentine pendant
Serpentinite; chiefly antigorite, lizardite, or chrysotile Mg₃Si₂O₅(OH)₄
metamorphic
Milky quartz cluster
Quartz (silicon dioxide, SiO₂), likely druzy or microcrystalline quartz
mineral
Tumbled milky quartz (likely chalcedony or quartzite)
Quartz/chalcedony, silicon dioxide (SiO₂)
mineral
Biotite-bearing granite or granodiorite
Coarse-grained felsic intrusive rock; chiefly quartz, feldspar, and biotite mica
igneous
Tumbled rose quartz
Quartz, silicon dioxide (SiO₂), pink variety
mineral
Amethyst quartz crystal cluster
Quartz, SiO₂; purple coloration from irradiation and trace iron
mineral
Milky quartz (rough quartz crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Crinoid Stem Fossil (Indian Bead)
Crinoid ossicle (Echinodermata)
fossil
Black obsidian arrowhead
Obsidian (volcanic glass), primarily silica-rich rhyolitic composition
igneous
Amber
Fossilized Tree Resin (C10H16O)
gemstone
Corundum (Sapphire variant)
Aluminum Oxide (Al2O3)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Pink Rhodonite
Manganese Silicate (MnSiO3)
mineral
Olivine
(Mg, Fe)2SiO4
Mineral
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Serpentine
Antigorite/Lizardite (Mg,Fe)3Si2O5(OH)4
metamorphic
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral