Fossil Coral (Favosites Honeycomb)
Favosites (Genus), Phylum Cnidaria, Class Anthozoa
sedimentary
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
Breccia
Clastic Breccia (General mineral composition depends on fragments, often SiO2 or CaCO3)
sedimentary
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 inclusions)
sedimentary
Beryl (Variety Mix)
Be3Al2(Si6O18)
Mineral
Red Granite
Phaneritic Felsic Intrusive Igneous Rock (primarily K-feldspar, Quartz, and Biotite)
igneous
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2)
igneous
Dragon Blood Jasper
Epidote with Red Piedmontite (Chalcedony/Quartz variant)
sedimentary
Mica Schist
Mica Schist (Composition typically includes Muscovite KAl2(AlSi3O10)(OH)2 and Quartz SiO2)
metamorphic
Granite
Granite (Phaneritic Acidic Igneous Rock)
igneous
Limestone
Calcareous sedimentary rock (primarily Calcium Carbonate, CaCO3)
sedimentary
Basalt
Extrusive mafic igneous rock
igneous
Granodiorite
Phaneritic Granodiorite
igneous
Basalt (Gravel Pebble)
Basalt (contains pyroxene, plagioclase feldspar, and olivine)
igneous
Granite Cobble
Granite (Felsic Intrusive)
igneous
Limestone (specifically Grainstone or Micrite)
Calcium Carbonate (CaCO3)
sedimentary
River Pebble (Gabbro or Dark Sandstone variety)
Mafic Intrusive Rock (Plagioclase Feldspar and Pyroxene)
igneous
Fossilized Shark Tooth (Dermal Denticle or worn tooth fragment)
Elasmobranchii (fossil remains)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Coquina
Biogenic Limestone (Calcite/Aragonite)
sedimentary
Pink Granite
Phaneritic Plutonic Igneous Rock (composed of K-feldspar, Quartz, and Mica)
igneous
Ferrous Slag
Iron/Steel Slag (Complex Calcium-Alumino-Silicates)
Anthropgenic (Industrial Byproduct)
K2 Azurite Granite / K2 Stone
Granite (igneous rock) with Azurite inclusions (mineral)
igneous
Granite
Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Basalt
Basalt
igneous
Pink Granite
Phaneritic Quartz-Feldspar Plutonic Rock
igneous
Pink Granite
Granite (Phaneritic igneous rock rich in Orthoclase)
igneous
Basalt
Mafic volcanic rock (Basalt)
igneous
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Granite (Mainly Quartz, Feldspar, and Mica)
igneous
Porphyritic Basalt
Basalt (with plagioclase phenocrysts)
igneous
Chert (and/or River Pebble)
Microcrystalline silica (SiO2)
sedimentary
Sea Glass (Cobalt Blue)
Amorphous Silica (Glass with Cobalt additives)
Anthropogenic specimen (man-made)
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Slate
Foliated Metamorphic Rock (Mainly composed of Quartz, Illite, Chlorite)
metamorphic
Porphyry
Porphyritic Andesite/Basalt
igneous
Aquamarine with Sunstone
Aquamarine (Be3Al2Si6O18), Sunstone (Na,Ca)Al(Si,Al)Si2O8
Mineral
Dendritic Agate (or Dendritic Opal)
SiO2 (for Agate), SiO2·nH2O (for Opal)
Mineral
Snowflake Obsidian
Volcanic glass (SiO2) with Cristobalite (SiO2) inclusions
igneous
Basalt
Extrusive Mafic Igneous Rock (composed primarily of plagioclase feldspar and pyroxene)
igneous
Basalt with Quartz Veins
Vesicular or aphanitic Basalt with SiO2 (Quartz) intrusions
Igneous