Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxide
Category
Browse organic gemstone (succinite) specimens identified by the Rock Identifier community.
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxide
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Red Chert
Microcrystalline Quartz (SiO2)
Polished amber (likely copal or amber)
Fossilized tree resin; amber is predominantly polymerized diterpenoid resin, while copal is younger, incompletely polymerized resin
Amber
Fossilized Tree Resin
Amber
Fossilized tree resin
Chert (Mudstone)
Microcrystalline Quartz (SiO2)
Chert (Basanite / Jasperoid)
Microcrystalline Quartz (SiO2)
Chert (often called Flint)
Microcrystalline Quartz (SiO2)
Pearl
Nacre (aragonite, CaCO₃, with conchiolin)
Pearl
Nacre (aragonite, CaCO₃, in a conchiolin matrix)
Chert (Yellow or Brown Jasper)
Microcrystalline Quartz (SiO2)
Chert (Jasper)
Microcrystalline Quartz (SiO2)
Chert (specifically Brown Chert or Jasper)
Microcrystalline Quartz (SiO2)
Chert (White Flint)
Silicon Dioxide (SiO2)
Pearl
Calcium Carbonate (Aragonite/Calcite mixed with Conchiolin), CaCO3
Pink Coral
Corallium rubrum (or related species, composed of calcium carbonate)
Black Pearl (Tahitian Type)
Aragonite / Pinctada margaritifera (CaCO3 + Conchiolin)
Red Coral (Sponge Coral / Apple Coral)
Corallium rubrum (calcium carbonate / organic gem)
Natural Freshwater Pearl
Calcium Carbonate (Aragonite and Calcite), CaCO3
Red Coral
Corallium rubrum
Chert (Iron-stained or Dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Chert (Jasper transition)
Microcrystalline Quartz (SiO2)
Pearl
Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3
Pearl
Aragonite / Calcium Carbonate (CaCO3)
Chert (often called Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Chert (Jasper/Mudstone variety with Oxidation)
Silicon dioxide (SiO2)
Jasper
Silicon dioxide (SiO2)
Jasper
Silicon Dioxide (SiO2) with impurities
Chert (Black Chert / Flint)
Silicon Dioxide (SiO2)
Chert (Dark Variety / Flint)
Silicon Dioxide (SiO2)
Chert (Flint)
Chert (Microcrystalline or cryptocrystalline Quartz - SiO2)
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
Chert (often called Jasper in this color)
Microcrystalline quartz (SiO2)
Chert (Siliceous Mudstone variant)
Microcrystalline quartz (SiO2)
Chert / Jasper
Microcrystalline Quartz (SiO2)
Chert (Nodular)
Microcrystalline Silica (SiO2)
Chert
Chert (Microcrystalline Quartz, SiO2)
Chert (Flint)
Silicon Dioxide (SiO2)
Chert (with Quartz Druzy)
Microcrystalline Silica (SiO2)
Moss Agate
Chalcedony (Silicon Dioxide - SiO2) with inclusions
Pearl
Organic Mineraloid (CaCO3 + Conchiolin)