Fulgurite
Fulgurite (Lechatelierite/Silica glass)
mineral
Category
Organic Gemstone (Fossilized Resin)
Browse organic gemstone (fossilized resin) specimens identified by the Rock Identifier community.
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Sandstone with Iron Concretion
Arenite with Limonite/Goethite Concretion
sedimentary
Sandstone
Arenite (SiO2 principal component)
sedimentary
Dendritic Quartz
Silicon Dioxide with inclusions (SiO2)
mineral
Turquoise and Red Coral
Turquoise: CuAl6(PO4)4(OH)8·4H2O; Red Coral: Corallium rubrum (organic gemstone)
mineral
Bamboo Leaf Jasper
Silicified Siltstone or Jasper (SiO2)
sedimentary
Turquoise cabochon
Turquoise; hydrated copper–aluminum phosphate, approximately CuAl6(PO4)4(OH)8·4H2O (composition varies)
gemstone
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Pearls
Pearl: biomineralized aragonite (CaCO₃) and conchiolin
gemstone
Fulgurite
Fulgurite (Lechatelierite-rich variety)
metamorphic
Pearl
Calcium carbonate (Aragonite/Calcite) - CaCO3
gemstone
Mixed Gemstone and Mineral Collection
Silicon Dioxide (SiO2) based minerals and others
mineral
Turquoise and Spiny Oyster (Heishi style beads)
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Spondylus (Spiny Oyster shell)
mineral and organic gemstone
Garden Quartz (Lodolite / Inclusion Quartz)
Quartz with inclusions (SiO2 with various mineral inclusions)
gemstone
Sandstone (with potential trace fossils)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Ruby in Fuchsite (Composite/Stabilized)
Corundum (Al2O3) in Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Fossilized Brachiopod
Brachiopoda (likely Order Spiriferida or Productida)
sedimentary
Flint / Chert (Fossiliferous)
Silicon dioxide (SiO2) with microcrystalline quartz
sedimentary
Turritella Agate / Fossiliferous Limestone
Elimia tenera in Chalcedony/Calcite Matrix
fossil
Mookaite Jasper
Radiolarite (SiO2)
sedimentary
Fossiliferous Limestone
Limestone with fossil bioclasts (Calcium Carbonate, CaCO3)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Greywacke with Quartz Vein
Matrix: Impure Sandstone (SiO2 + varied clasts), Veins: Quartz (SiO2)
sedimentary
Kambaba Jasper (Crocodile Jasper)
Stromatolitic Rhyolite/Jasper (SiO2)
sedimentary
Kambaba Jasper
Rhyolite (with Stromatolite fossil inclusions)
sedimentary
Fossilized Brachiopod
Phylum Brachiopoda (replaced by Calcite/CaCO3)
sedimentary
Red Coral (Precious Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
gemstone
Gastropod shell fragment
Calcareous mollusk shell; primarily aragonite or calcite (CaCO₃)
fossil
Natural White Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin - CaCO3
mineraloid
Synthetic Marbled Aggregate (Footwear Component)
Ethylene-vinyl acetate (Croslite™)
not a rock (man-made polymer)
Pearl
Calcium Carbonate (primarily Aragonite and Calcite), CaCO3
mineral
Calligraphy Stone
Mariam Jasper (Fossiliferous Limestone composed of Hematite and Shell remains)
sedimentary
Pearl
Nacre (Aragonite and Conchiolin), CaCO3
mineral
Chakra Stone (Composite / Man-made Bonded Gemstones)
Composite of Quartz, Lapis Lazuli, Aventurine, Tiger's Eye, and Jasper (SiO2, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, etc.)
Combined Minerals / Metaphysical stones
Tumbled turquoise-like stone
Likely turquoise, hydrated copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Quartzite (Engineered Stone)
Silicon Dioxide (SiO2) based synthetic composite
metamorphic
Sulfur (with possible Cullet Glass or Slag imitation)
Native Sulfur (S8)
mineral
Fulgurite
Lechatelierite
mineral
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Vesicular Basalt (or Rhyolite)
Extrusive Igneous Rock with Vesicular Texture
igneous
Petoskey Stone
Hexagonaria percarinata
fossil