Shungite
Non-crystalline carbon (Fullerenes / Carbon-60)
metamorphic
Category
Sedimentary (Fossilized Organic Matter)
Browse sedimentary (fossilized organic matter) specimens identified by the Rock Identifier community.
Oak Wood (Wood Grain Pattern)
Quercus (genus)
Organic (Non-rock)
Red Jasper
Red Jasper (variety of Chalcedony, SiO₂)
Mineral
Petrified Wood
Silicified Wood (SiO2 - primarily Quartz/Chalcedony/Opal)
Mineral/Fossil (Sedimentary context)
Jasper Agate
Silicon dioxide (SiO2)
mineral
Green Moss Agate
Agate (Silicon Dioxide, SiO2) with inclusions of hornblende or chlorite
mineral
Druzy Quartz on Vesicular Basalt
Silicon Dioxide (SiO2) in an extrusive Mafic igneous host rock
igneous
Mother of Pearl and Onyx
Aragonite (Mother of Pearl) and Chalcedony (Onyx)
mineral
Mother of Pearl (Nacre)
Nacre (Aragonite/Conchiolin), CaCO3 + Organic Polymers
mineral
Human Skin (Epidermis/Dermis)
Integumentary tissue (High content of hydroxyapatite in bones, though the surface is biological)
Mineral-like biological tissue
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineral
Black Pearl (Tahitian-style Cultured Pearl)
Calcium Carbonate (Aragonite) with Conchiolin (CaCO3)
mineral
Pearl (likely Freshwater or Akoya Cultured)
Aragonite / Conchiolin composite (CaCO3)
Mineralloid (Organic gemstone)
Precious Red Coral
Corallium rubrum / Corallium japonicum
mineral (organic gemstone)
Pearl
Calcium Carbonate (primarily Aragonite and Calcite), CaCO3
mineral
Lemon (Mock specimen mimicking Citrine/Sulfur)
Citrus x limon
Organic (Biological specimen)
Shungite (Noble/Type II)
Non-crystalline carbon (Fullerene-bearing carbonaceous rock)
metamorphic
Shell Cameo (Sardonyx Shell)
Cassis madagascariensis (Sardonyx shell)
mineral (biogenic silica/calcium carbonate substrate)
Blue Apatite
Apatite, Ca5(PO4)3(F,Cl,OH)
mineral
Pearl
Calcium Carbonate (Aragonite) with Conchiolin; formula: CaCO3
mineral
Black Freshwater Pearls
Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3
mineral
Shungite
Shungite (carbon-rich Precambrian rock)
mineral
Moss Agate / Chalcedony
Silicon Dioxide (SiO2)
mineral
Dendritic Agate
Chalcedony (SiO2) with manganese/iron oxide inclusions
mineral
Tahitian Pearl
Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3
mineral
Mother of Pearl (Nacre)
Aragonite (layered with organic polymers), CaCO3
mineral
Pearl
Organic gemstone (Calcium carbonate - CaCO3)
mineral
Ambergris
Ambergris (Coprolite-adjacent organic substance)
Organic (Geological interest)
Purple Agate (Dyed Chalcedony)
SiO2 (Silicon Dioxide) with organic dyes
mineral
Dyed Pink Quartzite (Jadeite Simulant)
Silicon Dioxide (SiO2) with organic dye
metamorphic
Ambergris
Ambergris (Coprolite-adjacent/Organic secretion)
mineraloid
Pearl
Aragonite and Conchiolin (CaCO3 + organic protein)
mineraloid
Conglomerate
Conglomerate
Sedimentary Rock
Aragonite (Star Cluster or Twinned variety)
Aragonite (Calcium Carbonate, CaCO3)
mineral
Precious Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
Mineral (Organic Gemstone)
Moss Agate
Chalcedony (Silicon Dioxide - SiO2) with inclusions
Mineral
Anthracite Coal
Anthracite (Carbon-based metamorphic rock, 86-97% C)
metamorphic
Chert (varietal known as Jasper or Flint)
Silicon Dioxide (SiO2)
Sedimentary Rock
Chalcedony (Agatized Coral / Rough Chalcedony Node)
Silicon Dioxide (SiO2)
mineral
Shungite
Non-crystalline carbon (similar to anthracite coal or meta-anthracite)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Turquoise and Spiny Oyster (Heishi style beads)
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Spondylus (Spiny Oyster shell)
mineral and organic gemstone