Chert (Chalcedony/Agate Pebble)
Cryptocrystalline Silica (SiO2)
sedimentary
Category
Organic Gem Material (Botanical)
Browse organic gem material (botanical) specimens identified by the Rock Identifier community.
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Tumbled Jasper and Tiger's Eye
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert (Flint Nodules)
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline silica (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Abalone Shell (Nacre)
Aragonite (CaCO3) - Biogenic Mineral
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon dioxide, SiO2
Mineral
Chert (varietal Flint)
Chert (SiO2)
sedimentary
Glauconitic Sandstone
Glauconitic Sandstone (Greensand)
sedimentary
Fossiliferous Limestone with Fossil Fragment
Fossiliferous Limestone (CaCO3 with organic remains)
fossil
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Pegmatitic mica-rich granite
Granitic pegmatite, composed mainly of quartz, feldspar, and biotite/muscovite mica
igneous
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Rounded sandstone pebble
Quartz-rich sandstone, likely ferruginous sandstone
sedimentary
Kyanite
Kyanite (Al2SiO5)
mineral
Peridotite
Peridotite (Ultramafic Rock)
igneous
Sunstone
(Ca,Na)(Al,Si)4O8 (Oligoclase or Andesine)
mineral
Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Diamond (Set in Jewelry)
Carbon (C)
gemstone
Petrified Wood / Fossilized Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Amber
Succinite (C10H16O)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Gastropod Fossil (Snail Steinkern)
Class Gastropoda (internal mold)
sedimentary
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Dinosaur Claw Fossil
Fossilized Theropod Claw (Vertebrate Palaeontological Specimen)
fossil
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Rough Blue Diamond
Carbon (C)
mineral
Tumbled light-colored stone, possibly quartzite or limestone
Indeterminate; likely quartzite (mostly SiO₂) or calcitic limestone (CaCO₃)
metamorphic
Quartz-rich vein rock, possibly milky quartz with iron-oxide staining
Quartz (SiO₂), likely with limonite/goethite and minor host-rock material
mineral
Turquoise cabochon jewelry
Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Sunstone (Aventurine Feldspar)
(Ca,Na)((Al,Si)2Si2O8) with inclusions of Cu or Fe2O3
mineral
Amethyst
Quartz, crystalline silica (SiO₂), purple variety
mineral
Likely specular hematite
Hematite (Fe₂O₃), probably a micaceous/specular variety
mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony/Opal replacing organic matter)
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert / Flint Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz–feldspar pegmatite specimen
Granitic pegmatite, chiefly quartz (SiO₂), potassium feldspar (KAlSi₃O₈), and mica-group minerals
igneous