Pink Opal
Hydrated silica (SiO2 "n H2O)
mineral
Category
Organic Materia (Not A Rock Or Mineral)
Browse organic materia (not a rock or mineral) specimens identified by the Rock Identifier community.
Learn about Organic Materia (Not A Rock Or Mineral) in the encyclopedia
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Green Moss Agate
Agate (Silicon Dioxide - SiO2 with inclusions of Manganese/Iron oxides)
mineral
Seashell Fragment
Calcium carbonate (CaCO3) - primarily Aragonite or Calcite
fossil
Mixed Quartz and Jasper Pebbles
Silicon Dioxide (SiO2)
Mineral
Veined Pebble (Quartz/Calcite Veined Metamorphic/Sedimentary Rock)
Quartz / Calcite Veined Fault Breccia or Metamorphic Pebble
metamorphic
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Turquoise and Spiny Oyster (Heishi style beads)
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Spondylus (Spiny Oyster shell)
mineral and organic gemstone
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary
Granite
Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)
igneous
Sandstone with Iron Banding
Arenite with Hematite or Limonite staining (SiO2 with Fe2O3)
sedimentary
Chert (Jasper/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth
Carcharodon carcharias (fossilized) / Hydroxyapatite permineralized with silica or iron
sedimentary
Breciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Shungite
Shungite (carbon-rich Precambrian mineraloid)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Chert (or Limestone)
Sedimentary Cryptocrystalline Quartz (SiO2) or Calcium Carbonate (CaCO3)
sedimentary
Chert (often called Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (White/Light Tan)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Amber
Amber (C10H16O)
mineral
Oak Wood (Wood Grain Pattern)
Quercus (genus)
Organic (Non-rock)
Quartzite with inclusions
Quartzite
metamorphic
Desert Rose
Gypsum (CaSO4·2H2O) or Barite (BaSO4)
mineral
Small seashell fossil or shell fragment
Likely calcium-carbonate shell material, chiefly aragonite or calcite; exact species indeterminate
fossil
Petrified Wood
Siliconized Wood (SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Fossilized Shark Tooth
Otodus sp. (approximate genus) / Hydroxyapatite fossil
sedimentary
Copper Ore (Malachite and Azurite stained rock)
Copper-bearing rock with secondary copper carbonates
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Petrified Wood
Silicified Wood (SiO2)
fossil
Ferruginous Sandstone with Concretion
Sandstone (SiO2 dominated with Fe2O3 cement)
sedimentary
Banded Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Pyrite in Shaly Matrix
Iron Sulfide (FeS2)
mineral
Black Jasper
Black Jasper (Silicate mineral - SiO2)
sedimentary
Pyrite in Limestone
Iron Sulfide (FeS2) in Calcium Carbonate (CaCO3)
mineral
Shungite
Carbonaceous rock (primarily amorphous carbon)
Mineraloid
Amber
Fossilized Tree Resin (C10H16O)
gemstone
Amber
Succinite (fossilized resin)
mineraloid
Moss Agate
Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions
mineral