Sandstone (lithic wacke/conglomerate mix)
Clastic Sedimentary Rock (SiO2 with lithic fragments)
sedimentary
Category
Anthropogenic Material (Man Made Rock)
Browse anthropogenic material (man made rock) specimens identified by the Rock Identifier community.
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Agate (specifically, multi-colored or pastel-dyed agate)
Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).
Mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Moonstone
Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8
mineral
Metaconglomerate
Metaconglomerate (Quartzite conglomerate)
metamorphic
Diorite
Phaneritic Intrusive Igneous Rock (composed of Plagioclase feldspar, Hornblende, and Biotite)
igneous
Vuggy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Dolerite (Diabase)
Dolerite / Diabase
igneous
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz with Limonite/Goethite staining)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Microcrystalline or Cryptocrystalline Silica (SiO2)
sedimentary
Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)
Chalcedony (SiO₂)
Mineral (or mineraloid if microcrystalline)
Granite Pebble
Felsic Igneous Rock (Granitic composition)
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Calcareous Sandstone)
Calcareous Sandstone (primarily SiO2 with CaCO3 cement)
sedimentary
Granite (weathered pebble)
Granite (plutonic igneous rock)
Igneous
Sandstone (likely Quartzose Sandstone pebble)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Granite
Granite (composed mainly of Quartz, Feldspar, and Mica)
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Pumice or Scoria
Vesicular volcanic rock
Igneous
United States Quarter Dollar
Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)
Metal / Man-made mineral-like object
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Sandstone (likely Quartzose)
Sandstone (Principally SiO2)
sedimentary
Sandstone (likely Arkosic or Lithic Sandstone)
Arenite (SiO2 based with mineral inclusions)
sedimentary
Sandstone
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Slag (Industrial Byproduct)
Ferrous/Non-ferrous Silicate
igneous (artificial/anthropogenic)
Sandstone (specifically Banded Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Granodiorite (River Pebble)
Granodiorite
igneous
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz-veined Siltstone
Siltstone with Quartz (SiO2) veins
sedimentary
Mudstone
Lutylite (group of fine-grained sedimentary rocks)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary