Sandstone
Arenite
sedimentary
Category
Sedimentary (Primary) With Artificial Modification
Browse sedimentary (primary) with artificial modification specimens identified by the Rock Identifier community.
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Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Shale
Laminated Fissile Pelite
sedimentary
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Sea Glass
Amorphous silicon dioxide (glass)
mineral
Limestone with Calcite Veins
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Chert (or Flint)
Chert (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH), AlOOH)
sedimentary
Blue Goldstone
Man-made glass infused with copper crystals
mineral
Tumbled feldspar-rich rock, likely pink-orange microcline or granite fragment
K-feldspar (microcline/orthoclase), approximately KAlSi₃O₈; exact identification requires testing
mineral
Dyed Agate
SiO2 (Silicon Dioxide)
Mineral
Black volcanic glass (likely obsidian)
Obsidian; predominantly rhyolitic volcanic glass composed chiefly of amorphous SiO₂
igneous
Synthetic Resin (Artificial Specimen)
Polyurethane or Polyester Resin
mineraloid (man-made)
Limonite or Goethite (Ironstone)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Rounded granitic gneiss or granite cobble
Biotite granite, possibly weakly foliated granitic gneiss; quartz–feldspar–biotite assemblage
igneous
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Hematite
Hematite (Fe2O3)
mineral
Rhodonite
Inosilicate (Mn,Fe,Mg,Ca)SiO3
mineral
Glauconite
(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Hematite Beads
Iron Oxide (Fe2O3)
mineral
Limestone with Lichen/Moss
Calcium Carbonate (CaCO3)
sedimentary
Hematite Nodule
Hematite (Fe2O3)
mineral
Polished black stone, likely black jasper or basalt
Most likely microcrystalline quartz (black jasper/chert), SiO₂; basalt is a plausible alternative
mineral
Yellow Agate
SiO2 (Quartz variety)
gemstone
Smoky quartz (likely)
Quartz, silicon dioxide (SiO₂), naturally irradiated variety
mineral
Magnetite / Ironstone
Magnetite (Fe3O4)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Dyed Dalmatian Stone (Dalmatian Jasper)
Aplite (predominantly quartz, feldspar, and arfvedsonite)
igneous
Carved smoky quartz (likely)
Quartz, silicon dioxide (SiO₂), smoky variety
mineral
Dyed pink banded agate
Chalcedony (microcrystalline quartz), SiO₂, commonly dyed
mineral
Tumbled milky quartz pebble
Quartz (silicon dioxide, SiO₂), opaque-to-translucent milky variety
mineral
Mixed sandstone and iron-rich sedimentary rock fragments
Quartz arenite/subarkose, with ferruginous cement and possible iron-oxide staining
sedimentary
Purple Agate (Dyed Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Bauxite (Concretionary)
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Blue glassy gemstone cabochon, likely dyed chalcedony or glass
Uncertain; possible dyed chalcedony (microcrystalline quartz, SiO₂)
gemstone
Carnelian Agate
SiO2 (Silicon Dioxide - Chalcedony variant)
gemstone