Diamond
Diamond (a metastable allotrope of carbon, C)
Category
Browse sedimentary (primary) with artificial modification specimens identified by the Rock Identifier community.
Diamond
Diamond (a metastable allotrope of carbon, C)
Chert (Tan/Yellow variety)
Microcrystalline quartz (SiO2)
Sandstone
Arenite (composed primarily of SiO2)
Sandstone
Arenite (primarily SiO2)
Quartz Geode
Silicon Dioxide (SiO2) in Host Rock
Jasper (Iron-rich)
Silicon Dioxide (SiO2) with Fe2O3 (Hematite) impurities
Red Jasper (Polished)
Jasper (Iron-rich Microcrystalline Quartz, SiO2)
Geode (Chert or Quartz Nodule)
Silicon Dioxide (SiO2)
Chert (Chert Nodule with Chalky Cortex)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
Green Opal
Hydrated Silica (SiO2·nH2O)
Sandstone
Clastic sedimentary rock (primarily SiO2)
Sandstone
Clastic sedimentary rock (primarily SiO2)
Sandstone (likely Arkose or Quartz Sandstone)
Clastic sedimentary rock (primarily SiO2)
Red Jasper
Silicon Dioxide (SiO2) with Iron impurities
Pyrite
Iron Sulfide (FeS2)
Fossiliferous Limestone with Brachiopod
Phylum Brachiopoda in calcitic matrix
Sandstone (with ripple marks)
Arenite / Quartz Sandstone
Knightia Fossil in Limestone
Knightia eocaena in micritic limestone
Malachite
Malachite (Cu2(CO3)(OH)2 - a copper carbonate hydroxide mineral)
Epidote
Epidote Group (e.g., Clinozoisite, Epidote, Piemontite), Epidote formula: Ca2(Al,Fe)3(SiO4)3(OH)
Quartz River Cobble
Silicon Dioxide (SiO2)
Chert (Agatized/Chalcedony variety)
Microcrystalline Quartz (SiO2)
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Sandstone (likely Arkosic)
Clastic Sedimentary Rock (primarily SiO2 with Feldspar)
Sandstone (Red Arkose)
Sandstone (Arkose variant, primarily SiO2 with KAlSi3O8)
Sandstone (Ferruginous)
Arenite (Fe-rich)
Chert (Beach Pebble)
Microcrystalline Quartz (SiO2)
Sandstone (Quartzose)
Arenite (primarily SiO2)
Coarse Sandstone
Arenite (SiO2 based)
Sandstone (likely Graywacke or Lithic Sandstone)
Clastic Sedimentary Rock
Caribbean Calcite
Calcium Carbonate with Argonite (CaCO3)
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
Bronzite
MgSiO3 (Enstatite with 10-30% FeSiO3 in solid solution)
Seraphinite
Clinochlore (Mg,Fe)5Al(AlSi3O10)(OH)8 - specific variety for Seraphinite due to its fibrous inclusions and chatoyancy.
Quartz (milky quartz variety)
Quartz (SiO₂)
Diamond
Diamond (Carbon, C)
Aquamarine
Aquamarine (Beryl variety); Be3Al2Si6O18
Diamond
Carbon (C)
Celadonite in Basalt (Green Earth)
Celadonite (K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2)
Limonite (Ironstone Concretion)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
Fossilized Fish Skeleton in Matrix
Vertebrata (Class: Actinopterygii), typically found in limestone or shale matrices