Dendritic Agate
Silicon Dioxide (SiO2) with Manganese or Iron Oxide inclusions
mineral
Category
Mineralogical Specimen
Browse mineralogical specimen specimens identified by the Rock Identifier community.
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Rutilated Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2 with Epidote/Tourmaline inclusions
mineral
Cone-in-cone structure
Cone-in-cone structure
sedimentary
Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Amethyst
Silicon Dioxide with Iron impurities (SiO2)
mineral
Crazy Lace Agate
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Ocean Jasper
Silicon Dioxide (SiO2) with various inclusions
Mineral (Variety of Quartz)
Banded Agate (Tumbled)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Peach Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8)
mineral
Tiger's Eye
Titanium-containing Quartz (Silica: SiO2)
Mineral
Amethyst (Tumbled)
Quartz (Silicon Dioxide, SiO2) with iron impurities
mineral
Rose Quartz
Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Amethyst (Quartz variety)
Silicon Dioxide (SiO2)
mineral
Blue Aragonite
Aragonite (Calcium Carbonate, CaCO3)
mineral
Lapis Lazuli
Lazurite-rich metamorphic rock (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Red Jasper (possibly Mookaite)
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Chrysoprase
Silicon Dioxide (Nickel-bearing Chalcedony) - SiO2
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz Vein on Matrix
Silicon Dioxide (SiO2)
mineral
Fossilized Shark Tooth (Cretaceous to Neogene)
Elasmobranchii dental fossil (likely Squalicorax or similar species)
mineral (biogenic replacement)
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
igneous
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Chert (Agatized)
Silicon dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Fossiliferous Limestone
Biogenic Limestone (CaCO3)
sedimentary
Weathered Sandstone with Algae Growth
Arenite
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Vesicular Basalt with Secondary Mineral Infill
Mafic Volcanic Rock (Basalt)
igneous
Dinosaur Fossil (Skull)
Dinosauria fossilis (Petrified Hydroxyapatite / Calcium Carbonate)
sedimentary
Agatized Fossil (Druzy Agate)
Silicon Dioxide (SiO2) replacing organic matter
sedimentary
Sandstone (with potential fossil inclusions)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Chert (Beach Pebble)
Silicon Dioxide (SiO2)
sedimentary
Septarian Nodule (Dragon Stone)
Septarian Concretion (CaCO3 with Siderite and Calcite)
sedimentary
Limestone (containing Fossil Mold)
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Chert (Banded)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Agate mix)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz (Ferruginous variety)
Silicon Dioxide (SiO2)
mineral
Jasper
Jasper (Silica/Silicon Dioxide, SiO2)
sedimentary
Chert (Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Granite Pebble
Intrusive Felsic Igneous Rock (primarily SiO2 with Al2O3, K2O, Na2O)
igneous