Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Category
Metamorphic Or Sedimentary Depending On Local Grade
Browse metamorphic or sedimentary depending on local grade specimens identified by the Rock Identifier community.
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Pink Sapphire
Corundum (Al2O3 with trace Chromium and Iron)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Magnetite
Magnetite (Iron(II,III) oxide, Fe3O4)
mineral
Moonstone
Orthoclase Feldspar (specifically showing adularescence)
Mineral
Tiger's Eye
Tiger's Eye (a variety of Quartz, SiO₂)
Mineral (specifically a gemstone variety)
Devil's Toenail
Gryphaea (extinct genus of foam oysters, typically composed of Calcite CaCO3)
sedimentary
Coral Fossil (Favosites type)
Phylum Cnidaria, Class Anthozoa (often CaCO3 - Calcium Carbonate)
sedimentary
Yellow Jasper (Mookaite style)
Silicon Dioxide (SiO2) with Goethite/Hematite inclusions
sedimentary
Limonitic Iron Ore / Goethite
Hydrated Iron(III) oxide-hydroxide (primarily FeO(OH)·nH2O)
sedimentary
Chert (Nodule)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Chert (Jasper type)
Microcrystalline Quartz (SiO2)
sedimentary
Green Jasper (Banded Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Golden/Yellow Variety)
Microcrystalline Silica (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Banded Agate (specifically Lake Superior Agate or similar)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Limestone (Brecciated/Recrystallized)
Calcium Carbonate (CaCO3)
sedimentary
Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Limonite
Limonite (Hydrous iron oxides, predominantly Goethite FeO(OH)·nH2O)
mineral
Ironstone (likely Limonite or Goethite)
Ferruginous sedimentary rock (FeO(OH)·nH2O)
sedimentary
Granite
Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)
igneous
Sandstone
Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)
Sedimentary Rock
Ruby Zoisite
Anyolite (Calcium aluminium silicate with Chromium/Corundum inclusions)
metamorphic
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chalcedony (Common Opal or Agate variant)
Silicon Dioxide (SiO₂)
mineral
Herkimer Diamond (Quartz Crystal)
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Chert (varietal: Jasper or Flint likely, but definitive identification is difficult from image)
SiO₂ (silicon dioxide)
Sedimentary
Chert
Chert (microcrystalline quartz)
sedimentary
Carnelian Agate
Carnelian (Silicon Dioxide, SiO2)
mineral
Optical Calcite (Iceland Spar)
Calcite (Calcium Carbonate, CaCO3)
mineral
River Pebble (Gneiss or Quartzite mixture)
Metamorphic rock (Commonly Gneissic)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Carnelian Agate
SiO2 (Silicon Dioxide) with Iron Oxide impurities
mineral