Mother of Pearl (Nacre)
Aragonite (layered with organic polymers), CaCO3
mineral
Category
Organic Gem Material (Botanical)
Browse organic gem material (botanical) specimens identified by the Rock Identifier community.
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Pearl
Organic gemstone (Calcium carbonate - CaCO3)
mineral
Bituminous Coal
Bituminous coal (Organic Sedimentary Rock)
sedimentary
Ambergris
Ambergris (Coprolite-adjacent organic substance)
Organic (Geological interest)
Purple Agate (Dyed Chalcedony)
SiO2 (Silicon Dioxide) with organic dyes
mineral
Bituminous Coal
Organic Sedimentary Rock (Carbon-based)
sedimentary
Dyed Pink Quartzite (Jadeite Simulant)
Silicon Dioxide (SiO2) with organic dye
metamorphic
Honey Calcite
Calcite (Calcium Carbonate - CaCO3)
mineral
Concrete Fragment
Hardened Portland cement and mineral aggregate
sedimentary (anthropogenic)
Fossiliferous Limestone
Bioclastic Limestone (CaCO3)
sedimentary
Concrete Rubble with Aggregate
Hardened Portland Cement Paste with Coarse Aggregate
Anthropogenic (Man-made)
Milky Quartz with Chlorite/Amphibite Inclusions
Silicon Dioxide (SiO2) with various mineral inclusions
mineral
Flint / Chert
Silicon dioxide (SiO2)
sedimentary
Chalky Limestone
Carbonate sedimentary rock (CaCO3)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz vein in Schist
Crystalline Silicon Dioxide (SiO2) in Metamorphic Host
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite in Conglomerate
Clastic Sedimentary Rock with Silicon Dioxide (SiO2) inclusions
sedimentary
Fossilized Horn Coral
Order Rugosa (Rugose Coral)
sedimentary
Ambergris
Ambergris (Coprolite-adjacent/Organic secretion)
mineraloid
Pearl
Aragonite and Conchiolin (CaCO3 + organic protein)
mineraloid
Bituminous Coal
Organic sedimentary rock (humic coal)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (Flint) with Glauconite
Microcrystalline Quartz (SiO2)
sedimentary
Goldstone
Aventurine Glass (Man-made glass with copper inclusions)
mineraloid / man-made glass
Brown Pebble (Probable Chert or Siltstone)
Silicon Dioxide (SiO2) / Sedimentary Microcrystalline Quartz
sedimentary
Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Fossilized Shark Teeth
Otodus sp. (Eocene Sand Tiger/Mackerel Shark)
fossil
Chert
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Chert (Nodular Chert)
Silicon Dioxide (SiO2)
sedimentary
Chert (Cherty Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Shungite (Noble/Type II)
Non-crystalline carbon (Fullerene-bearing carbonaceous rock)
metamorphic
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (v. Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (containing Calcite or Quartz inclusions)
Silicon Dioxide (SiO2) with varying mineral impurities
sedimentary
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Gravel Fragment)
Silicon dioxide (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert with Limestone Cortex
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
sedimentary
Amber
Succinates (Fossilized Tree Resin)
mineral
Chert (Jasper variation)
Silicon Dioxide (SiO2)
sedimentary