Agate
Agate (Cryptocrystalline Quartz, SiO2)
Mineral
Category
Man Made Object (Metalwork)
Browse man made object (metalwork) specimens identified by the Rock Identifier community.
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Amethyst and Ruby in Zoisite
Silicon Dioxide (SiO2) and Anyolite (Zoisite-Hornblende-Ruby mix)
mineral and metamorphic rock
Charoite
Charoite (K(Ca,Na)2Si4O10(OH,F)·nH2O)
metamorphic
Ocean Jasper
SiO2, highly silicified rhyolite or spherulitic chalcedony
mineral
Amethyst (Polished Cabochon)
Silicon Dioxide (SiO2) with iron impurities
mineral
Tumbled epidote-bearing rock (likely epidote–quartz–feldspar aggregate)
Epidote-rich metamorphic rock; minerals likely epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH), quartz, feldspar, and dark amphibole/biotite)
metamorphic
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Calcite (Honey Calcite and Agate)
Calcium Carbonate (CaCO3)
mineral
Tektite
Natural impact glass
meteorite
Polished dendritic agate or jasper
Microcrystalline quartz (SiO₂), likely chalcedony with manganese-oxide dendrites
mineral
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Chert
Microcrystalline quartz (SiO2)
sedimentary
Quartzite
Quartzite (Metamorphic Quartz Sandstone)
metamorphic
Chert
Microcrystalline quartz (SiO2)
sedimentary
Mother of Pearl (Nacre) / Shell Fragment
Biogenic Calcium Carbonate (Aragonite and Conchiolin)
fossil
Limestone
Sedimentary Rock (Primarily CaCO3)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Beach Pebble (Chalcedony / Chert)
Silicon Dioxide (SiO2)
mineral
Chert (Black Flint)
Silicon Dioxide (SiO2)
sedimentary
Red Sandstone
Arenite (Iron-rich)
sedimentary
Sand Tiger Shark Tooth (Fossil)
Carcharias taurus (fossilized dentin/enameloid)
fossil
Crinoid Columnal Fossil in Chert
Crinoidea stemming section in Microcrystalline Quartz (SiO2)
fossil
Diabase (Dolerite)
Diabase or Dolerite
igneous
Pearl
Pearl (Calcium Carbonate with organic conchiolin, CaCO3)
mineral
Chert (with Limestone matrix)
Silicon dioxide (SiO2)
sedimentary
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8) with Albite inclusions
mineral
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and/or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Diorite
Phaneritic Intrusive Igneous Rock (composed of Plagioclase feldspar, Hornblende, and Biotite)
igneous
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (variations include Flint/Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Breccia
Breccia
sedimentary
Chert / Jasper
Silicon Dioxide (SiO₂)
sedimentary
Diamond
Diamond (pure Carbon, C)
mineral
Silver (Jewelry form)
Native Silver (Ag)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Coquina and Oyster Fossil Rock
Coquina limestone (Calcium Carbonate, CaCO3) containing fossilized Crassostrea / bivalve shells
fossil
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Ambergris (Geological/Organic Specimen)
Ambra grisea (Produced by Physeter macrocephalus)
organic material
Polished fossilized ammonite or nautiloid shell
Ammonoidea or Nautiloidea; originally aragonitic shell, commonly replaced by calcite or chalcedony
fossil
Chalcedony Pebble (Carnelian / Quartz Pebble)
Silicon Dioxide (SiO2)
mineral