Amethyst (Agate/Chalcedony variety)
Silicon Dioxide (SiO2) with iron impurities
mineral
Category
Sedimentary (Primary) With Artificial Modification
Browse sedimentary (primary) with artificial modification specimens identified by the Rock Identifier community.
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Silver (Jewelry Specimen)
Native Silver (Chemical Formula: Ag)
mineral
Chrysoprase
Chalcedony (Silicon Dioxide, SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Gold Nugget
Native Gold (Au)
mineral
Basalt (River Rock)
Basalt
igneous
Basalt
Aphanitic Mafic Volcanic Rock
igneous
Granite Fragment
Felsic Plutonic Rock (Granite)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Basalt with Feldspar phenocrysts
Aphanitic to Porphyritic Mafic Volcanic Rock
igneous
Granite Cobble
Granite (Phaneritic Igneous Rock)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
Basalt (Polished)
Extrusive mafic igneous rock
igneous
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Gold-bearing Quartz
Lode Gold in Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Basalt (Vesicular)
Basalt (Extrusive Volcanic Rock)
igneous
Orthoclase Feldspar (Potassium Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Blue Aragonite
Aragonite (Calcium Carbonate, CaCO3)
mineral
Cinnabar in Dolomite or Quartz (Cinnabrite)
Mercury sulfide (HgS) in Dolomite (CaMg(CO3)2)
metamorphic
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Granite
Phaneritic plutonic igneous rock (SiO2 rich)
igneous
Granite Water-Worn Pebble
Intermediate to Felsic Phaneritic Igneous Rock
igneous
Jasper with Pyrite (Gold-colored inclusions)
Silicon Dioxide (SiO2) with Iron Disulfide (FeS2) inclusions
sedimentary (chemical/biological)
Banded Chert or Chert with Quartz Veins
Chert (SiO2)
Sedimentary
Precious Coral
Corallium rubrum (Calcium carbonate with trace carotene)
Organic gemstone / Sedimentary mineraloid
Calcite (likely a tumbled specimen)
Calcite (CaCO 3 )
Mineral
Labradorite (tumbled)
Labradorite (a plagioclase feldspar mineral between anorthite and albite; chemical formula: (Ca,Na)(Si,Al)4O8)
Mineral
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Pyrite (or Fool's Gold)
Pyrite (FeS₂)
Mineral
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
Shale or Slate with Quartz Veins
Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins
Metamorphic, likely Sedimentary with Quartz veins
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Pyromorphite
Pyromorphite (Pb5(PO4)3Cl)
mineral
Native Copper Nugget
Native Copper (Cu)
mineral
Rough Sapphire (Corundum)
Corundum (Al2O3)
mineral
Eudialyte
Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2
Mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral