Polished amber-colored translucent stone, likely citrine or yellow chalcedony
Most consistent with quartz (SiO₂), potentially citrine; translucent yellow chalcedony is another possibility
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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Red Jasper with Quartz
Microcrystalline Quartz (SiO2)
sedimentary
Amber (Rough Baltics/Beach Specimen)
Succinicum (Organic Gemstone - Fossilized Resin)
mineral
Chalcedony (Common Agate)
Silicon Dioxide (SiO2)
mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Petrified Wood
Fossilized Wood (SiO2 replacing organic matter)
fossil
Peach Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8) with inclusions
mineral
Pink Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin (CaCO3)
mineral
Petrified Wood and Mixed Rocks
Silicified Wood (SiO2)
fossil
Graphite
Graphite (Carbon, C)
mineral
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Iron-stained quartz-bearing rock (likely gold-bearing quartz vein fragment)
Quartz (SiO₂) with iron oxides/hydroxides, possibly limonite/goethite and minor sulfides
mineral
Raw emerald-bearing beryl (probable)
Beryl, Be₃Al₂Si₆O₁₈; green color from trace chromium and/or vanadium
mineral
Tumbled yellow jasper or silicified rock fragment
Microcrystalline quartz (chalcedony), SiO₂, likely iron-oxide colored
mineral
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Amber (likely a small rough amber piece)
Fossilized plant resin; amber is an organic mineraloid, not a crystalline mineral
gemstone
Amber
Succinite (C10H16O)
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Chert (Flint Nodules)
Chert (Silicon Dioxide, SiO2)
sedimentary
Amber
Succinite (Fossilized Resin)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood (Black / Carbonized)
Silicon Dioxide (Quartz/Chalcedony replacing Organic Matter)
fossil
Moonstone
Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
metamorphic
Chert (Red Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Concretion
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Pearl
Calcium Carbonate (CaCO3) + Conchiolin
mineral
Fossilized Shark Tooth (Partial) or Coprolite
Elasmobranchii (fossil) or Coprolite (trace fossil)
fossil
Sandstone (likely Fossilized Wood or Concrete Simulacrum)
Arenite / Silicified Wood / Anthropogenic Concrete
sedimentary
Hag Stone
Perforated sedimentary rock (typically limestone, sandstone, or flint)
sedimentary
Moss Agate
Chalcedony (Silicon Dioxide - SiO2) with inclusions
Mineral
Turquoise jewelry beads/earrings
Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; possibly reconstructed or imitation turquoise
gemstone
Fluorite
Fluorite (CaF2)
mineral
Chert (Common Opal/Agatized Rock)
Microcrystalline Quartz (SiO2) with potential Chalcedony/Opaline silica
sedimentary
Chert (Sedimentary Rock)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicon Dioxide Fossilized Wood (SiO2)
fossil
Blue-green copper mineral specimen, likely chrysocolla-bearing rock
Chrysocolla, hydrated copper phyllosilicate: approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; possibly mixed with malachite or chrysocolla matrix
mineral
Quartz
Silicon Dioxide (SiO2)
mineral