Slag
Glassy silicate byproduct (anthropogenic material)
industrial byproduct
Category
Organic Gem Material (Botanical)
Browse organic gem material (botanical) specimens identified by the Rock Identifier community.
Brown Quartz (Jasper or Chert)
Silicon Dioxide (SiO2)
sedimentary
Terrazzo (Synthetic Composite Rock)
Cementitious or Epoxy Resin-bound Aggregates
Man-made metamorphic-style composite
Orthoceras Fossil Limestone
Orthoceras (extinct Cephalopod fossil) in Matrix
sedimentary
Coquina / Shelly Limestone
Coquina (Biogenic Limestone)
sedimentary
Fossilized Horn Coral
Order Rugosa (Rugose Coral)
sedimentary
Concrete Rubble with Aggregate
Hardened Portland Cement Paste with Coarse Aggregate
Anthropogenic (Man-made)
Concretionary Sandstone
Clastic Sedimentary Rock (Sandstone with secondary mineral cementation)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with mineral inclusions
Mineral
Moss Agate
Chalcedony (Silicon Dioxide) with inclusions - SiO2
mineral
Amber
Succinite (fossilized resin)
mineral
Dendritic Agate
Chalcedony (SiO2) with manganese/iron oxide inclusions
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide
mineral
Amber
Succinite (Formula: C10H16O)
mineral
Amber (specifically Red or Cherry Amber)
Succinite (Resinite); Chemical formula: C10H16O
Mineraloid
Amber
Fossilized Tree Resin (Succinate)
mineral
Fish Fossil in Limestone
Lycoptera (likely) in Micritic Limestone
sedimentary
Bituminous Coal
Organic Sedimentary Rock (Carbon-based)
sedimentary
Mother of Pearl (Nacre)
Aragonite (layered with organic polymers), CaCO3
mineral
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
Dyed Pink Quartzite (Jadeite Simulant)
Silicon Dioxide (SiO2) with organic dye
metamorphic
Concrete Fragment
Hardened Portland cement and mineral aggregate
sedimentary (anthropogenic)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite in Conglomerate
Clastic Sedimentary Rock with Silicon Dioxide (SiO2) inclusions
sedimentary
Quartz vein in Schist
Crystalline Silicon Dioxide (SiO2) in Metamorphic Host
metamorphic
Glauconite (Green Sandstone)
Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2
sedimentary
Chalky Limestone
Carbonate sedimentary rock (CaCO3)
sedimentary
Flint / Chert
Silicon dioxide (SiO2)
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide
mineral
Tahitian Pearl
Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3
mineral
Sandstone or Limestone
Sedimentary Rock
Sedimentary
Asphalt (Bituminous Concrete)
Composite material (bitumen binder with mineral aggregate)
man-made rock (technosol)
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Amber
Succinite (specifically for Baltic amber); Chemical formula approximately C10H16O
mineral
Amber
Succinite (approximate formula C10H16O)
mineraloid