Granite
Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).
igneous
Category
Man Made Rock (Technosol)
Browse man made rock (technosol) specimens identified by the Rock Identifier community.
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United States Quarter Dollar
Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)
Metal / Man-made mineral-like object
Diamond (as featured in jewelry)
Diamond (C - pure carbon)
mineral
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Tiger Shark Fossil Tooth
Galeocerdo cuvier (fossilized)
sedimentary
Chalcanthite (Likely Synthetic/Lab-Grown)
Hydrated copper(II) sulfate (CuSO4·5H2O)
mineral
Dark rounded pebble, likely basalt or slag
Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag
igneous
Goldstone
Not a natural mineral or rock. It is an ornamental glass.
Manufactured Glass (Simulant)
Goldstone
Avventurina (Cu + SiO2 glass)
mineral
Green Aura Quartz
Silicon Dioxide (SiO2) bonded with metallic vapors (typically Gold, Chromium, or Titanium)
mineral
Turquoise (likely stabilized or simulated Howlite)
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Quartz (Pebble)
Quartz (SiO₂)
Mineral
Amethyst
SiO2 (Silicon Dioxide)
Mineral
Diamond (Cut jewelry specimen)
Diamond (pure Carbon, C)
mineral
Ruby in Matrix
Corundum (Al2O3)
mineral
Granite, possibly granodiorite
Coarse-grained felsic plutonic rock; chiefly quartz (SiO₂), potassium feldspar and plagioclase feldspar, with biotite and/or hornblende
igneous
Coquina
Bioclastic Limestone
sedimentary
Coquina
Bioclastic Limestone
sedimentary
Petoskey Stone
Hexagonaria percarinata
fossil
Diamond (Cut and Polished)
Diamond (pure Carbon, C)
gemstone
Diamond
Carbon (C)
mineral
Chert (specifically Flint Arrowhead)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Fossil Sea Urchin (Echinoid)
Echinoidea fossil (often replaced by silica or calcite)
fossil
Synthetic Convention Badge (Plastic/PVC)
Polyvinyl Chloride (PVC) / Polycarbonate
mineraloid (synthetic)
Obsidian
Volcanic Glass (70% or more SiO2)
igneous
Fossiliferous Limestone
Limestone (composed primarily of calcite with included fossils CaCO3)
Sedimentary
Lapis Lazuli
Lapis Lazuli (Complex rock consisting primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2)
metamorphic
Flint/Chert Nodule in Limestone
Sedimentary rock containing microcrystalline quartz (SiO2) within a calcium carbonate (CaCO3) matrix
sedimentary
Diamond (or Diamond Simulant)
Carbon (C) or Cubic Zirconia (ZrO2)
gemstone
Seashell Fragment
Calcium carbonate (CaCO3) - primarily Aragonite or Calcite
fossil
Diamond (Cut Gemstone)
Carbon (C)
gemstone
Coquina
Bioclastic Limestone
sedimentary
Banded agate pendant (likely carnelian or brown-and-white chalcedony agate)
Agate, a banded variety of chalcedony; microcrystalline quartz, SiO₂, with iron-oxide coloration
gemstone
Chert (specifically Yellow/Brown Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide)
igneous
Diamond
Diamond (pure Carbon, C)
mineral
Diamond Plate (Steel)
Alloyed Carbon Steel or Aluminum with 'Durbar' pattern
not a rock (Man-made industrial metal)
Obsidian
Obsidian (volcanic glass, amorphous silica rich rock)
Igneous
Diamond
Carbon (C)
mineral
Engineered Quartz Stone
Agglomerated Quartz (SiO2 + Polymer Resin)
mineral-based composite
Diabase (Dolerite)
Diabase / Dolerite
igneous
Marble
Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.
Metamorphic Rock