Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Feldspar, and Mica)
igneous
Category
Antropogenic (Man Made Material)
Browse antropogenic (man made material) specimens identified by the Rock Identifier community.
Granite
Granite (a phaneritic intrusive igneous rock)
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Snowflake Obsidian
Volcanic glass with Cristobalite inclusions (70–75% SiO2)
igneous
Granite
Granite (Silicic Intrusive Igneous Rock)
Igneous
Granite
Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)
igneous
Granodiorite
Granodiorite (Quartz + Plagioclase + Alkali Feldspar + Biotite/Hornblende)
igneous
Blue Chalcedony
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Bivalve Fossil (Shell Fragment)
Class Bivalvia (Calcium Carbonate - CaCO3)
sedimentary
Amethyst
Amethyst (Silicon Dioxide - SiO2 with Iron impurities)
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Pearl
Aragonite (CaCO3) with Conchiolin
mineral
Diabase (Greenstone)
Diabase (Dolerite)
igneous
Rose Quartz Carving
Quartum roseum (Variety of Quartz, SiO2)
Mineral
Obsidian
Obsidian (volcanic glass)
Igneous
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Lapis Lazuli
Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2
Metamorphic rock
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
sedimentary
N/A - Image does not contain a rock or mineral
Anthropogenic textile material
Non-geological
Chert (with Limestone matrix)
Silicon dioxide (SiO2)
sedimentary
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8) with Albite inclusions
mineral
Diorite
Phaneritic Intrusive Igneous Rock (composed of Plagioclase feldspar, Hornblende, and Biotite)
igneous
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Silver (Jewelry form)
Native Silver (Ag)
mineral
Coquina
Biogenic Limestone (CaCO3)
sedimentary
Diamond (Cluster Ring)
Carbon (C)
mineral
Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineraloid
Granite
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)
igneous
Diamond in Kimberlite
Diamond in Kimberlite Matrix (Diamond: C, Kimberlite: complex Potassic Peridotite)
igneous
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Chert (often called Flint)
Chert (Microcrystalline or cryptocrystalline Silica, SiO2)
sedimentary
Moonstone (specifically Rainbow Moonstone / White Labradorite)
White Labradorite (Feldspar Group: (Na,Ca)(Al,Si)4O8)
mineral
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (variant of Flint)
Chert (SiO2)
Sedimentary
Slag (Industrial Byproduct)
Ferro-silicate glass (Slag)
Anthropogenic (Man-made industrial deposit)
Sea Glass (Uranium/Vaseline Glass variant)
Silicon Dioxide (SiO2) with trace Uranium Oxide (U3O8)
man-made silicate (anthropogenic glass)
Red Sandstone
Arenite (with Iron Oxide / Hematite staining)
sedimentary
Sandstone
Arenite (SiO2 based typically)
sedimentary