Chalk
Micrite (primarily Calcium Carbonate, CaCO3)
sedimentary
Category
Anthropogenic (Human Made) Sedimentary Like Material
Browse anthropogenic (human made) sedimentary like material specimens identified by the Rock Identifier community.
Sandstone
Arenite (primarily SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Terracotta (Man-made ceramic brick fragment)
Baked clay / High-iron ceramic (Silicate-based ceramic)
Anthropogenic material (Man-made sedimentary mimic)
Pink Granite
Phaneritic Felsic Igneous Rock (Granite, rich in Potassium Feldspar)
igneous
Sandstone Concretion
Septarian or Carbonate-cemented Sandstone Concretion
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert (with Desert Varnish/Iron Stain)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Brown Sandstone
Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Obsidian
Volcanic Glass (SiO2 rich)
igneous
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Chert (Jasper Variant likely)
Silicon Dioxide (SiO2)
Sedimentary Rock or Mineral (depending on origin and purity)
Chert Pebble (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite (Iron Stone/Ocher)
Limonite (FeO(OH)·nH2O)
mineral
Chert (Field-collected Arrowhead-shaped Fragment)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Jewelry Chain with Blue and Clear Gemstones (Likely Cubic Zirconia)
Cubic Zirconia (ZrO₂), Silver or White Gold/Platinum Alloy
Mineral (synthetic) and Metal (precious/base)
Opaline Glass (Opalite)
Synthetic Silicon Dioxide Glass
Mineraloid (Man-made)
Chert / Flint Nodule
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (specifically Blue Chert/Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Beaded Jewelry (Assorted Gemstones)
Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ
Mineral, Jewelry
Sandstone Concretion
Clastic sedimentary rock (primarily Quartz SiO2)
sedimentary
Sea Glass (specifically Frosted White)
Amorphous Silica (substance: Sodium-calcium silicate glass)
Mineraloid (Anthropogenic/Man-made rock)
Red Swirl Beads (Likely Resin or Glass, simulating Red Jasper or Agate)
N/A (for the beads as pictured); Red Jasper: SiO2 (Chert variety); Red Agate: SiO2 (Chalcedony variety)
Organic (if resin) or Synthetic (if glass); simulating Sedimentary or Metamorphic (for natural stones)
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically Gray/Blue-Gray Chert)
Chert (SiO2)
sedimentary
Cobalt Blue Sea Glass
Amorphous Silica Glass (SiO2 + CoO)
mineraloid / anthropogenic material
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (often called Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Iron Slag
Ferrous slag (primarily silicates and oxides of calcium, iron, and magnesium)
Anthropogenic (Man-made industrial byproduct)
Chert
Chert (microcrystalline quartz, SiO2)
Sedimentary
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Opalite
Man-made opalescent glass (SiO2 + metal oxides)
mineral (synthetic)
Agate (specifically Lake Superior Agate style or Banded Chalcedony)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Porcelain (White Ceramic)
Mullite-bearing Vitrified Ceramic (Major phases: Mullite Al6Si2O13, Glassy Silica SiO2)
metamorphic
Diorite (Gneissic)
Diorite
igneous
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper and Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Man-made Synthetic Material (Not a rock or mineral)
Polyester (Polyethylene terephthalate) / Faux Fur
Synthetic / Textile