Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Category
Organic Gemstone (Not A Rock Or Mineral In The Traditional Sense, But Bio Mineralized Material)
Browse organic gemstone (not a rock or mineral in the traditional sense, but bio mineralized material) specimens identified by the Rock Identifier community.
Learn about Organic Gemstone (Not A Rock Or Mineral In The Traditional Sense, But Bio Mineralized Material) in the encyclopedia
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Tumbled turquoise
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Chlorastrolite (Greenstone)
Chlorastrolite (variety of Pumpellyite) - Ca2(Mg,Fe)Al2(SiO4)(Si2O7)(OH)2 · H2O
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Fossil Shark Tooth
Chondrichthyes (class); likely Lamniformes (order) fossilized in Apatite/Hydroxyapatite
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Banded Agate (specifically Carnelian Agate / Sardonyx)
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Fossiliferous Sandstone / Fossil Fragment
Fossiliferous Sedimentary Matrix with Indeterminate Fossil Material
fossil
Polished white-and-brown chalcedony (likely agate/jasper)
Microcrystalline quartz, SiO₂; chalcedony with iron-oxide staining or jasperous inclusions
mineral
Dalmatian jasper beads
Commercially “Dalmatian jasper”; commonly spotted, silica-rich rock sold as jasper, though many specimens are feldspar-rich rock rather than true jasper (microcrystalline quartz).
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Amber
Succinite (Fossilized Resin)
gemstone
Amber
Succinite
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Iron-rich chert or jasper
Microcrystalline quartz (SiO₂), commonly colored by hematite/goethite
sedimentary
Wishing Stone with Quartz Vein
Quartz-veined sedimentary pebble
sedimentary
Yellow amber beads
Amber (fossilized tree resin; organic mineraloid, not a true mineral)
gemstone
Blue-green turquoise (probable)
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Turquoise in Matrix
CuAl6(PO4)4(OH)8·4H2O
gemstone
Weathered granitic rock
Granite or granodiorite, likely quartz–feldspar–mica aggregate
igneous
Tumbled larimar
Larimar; blue pectolite, NaCa₂Si₃O₈(OH)
gemstone
Shark Tooth Fossil
Carcharodon / Otodus fossilized tooth (Calcium Phosphate / Hydroxyapatite)
fossil
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Chert (Nodular or Massive Variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Hag Stone
Calcareous sedimentary rock (often Chert, Flint, or Limestone)
sedimentary
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Peridotite (Olivine Rock)
Peridotite (composed largely of olivine, (Mg, Fe)2SiO4)
igneous
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst ring
Amethyst, purple quartz (SiO₂), likely set with diamond or other accent stones
gemstone
Pearl (with Peridot)
Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4
mineral
Shale or Siltstone
Sedimentary Clastic Rock (Variable mineral composition including quartz and clay minerals)
sedimentary
Yellow Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Amber
Fossilized Tree Resin (C10H16O)
gemstone
Nephrite Jade
Tremolite-Actinolite solid solution series (Ca2(Mg,Fe)5Si8O22(OH)2)
metamorphic
Schist
Schist; commonly mica schist, composed chiefly of muscovite/biotite mica with quartz and feldspar
metamorphic
Banded quartz-rich rock (possibly pegmatite)
Likely quartz–feldspar pegmatite; identification is tentative from the photo
igneous
Purple glassy pebble, possibly slag glass
Unidentified; likely man-made glass rather than a natural mineral
mineral
Mammoth or Mastodon Tooth Fragment
Mammuthus / Mammut molar fragment
fossil