Diamond
Diamond (pure Carbon, C)
mineral
Category
Industrial Byproduct (Anthropogenic Material)
Browse industrial byproduct (anthropogenic material) specimens identified by the Rock Identifier community.
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Moissanite
Silicon Carbide (SiC)
mineral
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Paper (Cellulose)
Cellulose (C6H10O5)n
Organic (Anthropogenic)
White Marble
Recrystallized Calcite (CaCO3) / Marble
metamorphic
Unakite-like jasper / epidote–feldspar rock
Epidote–feldspar–quartz aggregate; commonly marketed as unakite or brecciated jasper
metamorphic
Cultured Marble (Synthetic)
Polymer-matrix composite (typically calcium carbonate in polyester resin)
Synthetic / Composite Material
Tumbled blue glassy mineral, possibly sodalite or blue aventurine
Identification uncertain; likely sodalite (Na₈Al₆Si₆O₂₄Cl₂) or blue-dyed quartz/slag-like material
mineral
Dark rounded pebble, likely basalt or slag
Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag
igneous
Diamond
Carbon (C)
gemstone
Chert (Green variety)
Silicon Dioxide (SiO2)
sedimentary
Diamond (Faceted)
Carbon (C)
gemstone
Chert (Flint Nodule)
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Diamond
Diamond (pure Carbon, C)
mineral
Concrete with Aggregate
Composite construction material; primary matrix is Calcium Silicate Hydrate (C-S-H)
anthropogenic (human-made) sedimentary-like material
Yellow Quartzite Pebble
Quartzite (SiO2)
metamorphic
Fossilized oyster or bivalve shell
Fossil Gryphaeidae or Ostreoidea; calcitic shell, CaCO₃
fossil
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Peridot (Olivine)
Olivine, (Mg, Fe)2SiO4
mineral
Milky Quartz
Quartz / Silicon Dioxide (SiO2)
mineral
Chert (and Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Ironstone (likely Limonite or Goethite)
Ferruginous sedimentary rock (FeO(OH)·nH2O)
sedimentary
Rounded reddish-brown pebble
Likely ferruginous sandstone or iron-rich quartzite; exact identification requires a fresh surface and tests
sedimentary
Quartz-rich rock with chlorite/epidote vein
Milky quartz with green chlorite or epidote; exact identification requires testing
metamorphic
Polished fluorite sphere
Fluorite (calcium fluoride, CaF₂)
mineral
Weathered quartz-rich rock fragment
Likely quartz-bearing feldspathic rock; exact identification requires testing
mineral
Banded Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Peridot (Olivine)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Quartz Vein in Host Rock (Breccia/Rhyolite)
Silicon Dioxide (SiO2) with matrix
Mineral in Igneous/Sedimentary host
Quartz (specifically Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite
metamorphic
Diamond (Cullinan Heritage)
Carbon (C)
mineral
Granite Pegmatite with Muscovite Mica
Granite Pegmatite (Silicon Dioxide and complex silicates)
igneous
Rough Diamond
Native Carbon (C)
mineral
Ruby in Matrix
Corundum (Al2O3)
mineral
Diamond (in Ring Setting)
Diamond (C)
gemstone
Graywacke
Lithic Sandstone (Graywacke)
sedimentary
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Basalt
Basalt
igneous
Quartzite
Quartzite (principally SiO2)
metamorphic
Basalt
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary