Silver (S925)
Native Silver (Ag)
mineral
Category
Sedimentary (Primary) With Artificial Modification
Browse sedimentary (primary) with artificial modification specimens identified by the Rock Identifier community.
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Mineral
Calcite (likely a tumbled specimen)
Calcite (CaCO 3 )
Mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Cuprite
Cuprite (Copper(I) oxide, Cu2O)
mineral
Muscovite Mica
Muscovite (Potassium Aluminum Silicate) - KAl2(AlSi3O10)(F,OH)2
mineral
Granite
Phaneritic Plutonic Felsic Rock
igneous
Concrete Rubble with Aggregate
Hardened Portland Cement Paste with Coarse Aggregate
Anthropogenic (Man-made)
Amethyst
Quartz (Silicon Dioxide with Iron impurities), SiO2
mineral
Asphalt Concrete
Bituminous Concrete / Asphaltic Composite
not a natural rock (man-made composite)
Gold Nugget
Native Gold (Au)
mineral
Synthetic Marbled Aggregate (Footwear Component)
Ethylene-vinyl acetate (Croslite™)
not a rock (man-made polymer)
Lapis Lazuli (blue bead) and Moss Agate (green heart)
Lapis Lazuli (lazurite-based rock) and Moss Agate (SiO2 with manganese/iron inclusions)
metamorphic (Lapis) and sedimentary/igneous assoc. (Moss Agate)
Asphalt (Bituminous Concrete)
Asphaltum / Bitumen-Aggregate Matrix
Technonatural composite (often containing sedimentary/igneous aggregate)
Quartz
Quartz (Silicon Dioxide - SiO2)
Mineral
Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)
Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)
Synthetic (Ceramic)
Jasper with Pyrite (Gold-colored inclusions)
Silicon Dioxide (SiO2) with Iron Disulfide (FeS2) inclusions
sedimentary (chemical/biological)
Gold Ore / Native Gold
Native Gold (Au)
mineral
Hematite (beads)
Hematite (Fe₂O₃)
Mineral
Basalt Cobble
Vesicular Basalt (Mafic Extrusive)
igneous
Basalt with Epidote (Greenstone)
Epidote-bearing Metabasalt
metamorphic
Granite Pebble
Granite (composition of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Pink Granite (River Pebble)
Felsic Intrusive Igneous Rock
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Gold Placer (Gold Flakes and Nuggets)
Native Gold (Au)
mineral
Gold
Native Gold (Au)
mineral
Gold (in Opaque Matrix/Jewelry)
Native Gold (Au)
mineral
Chalcopyrite in Quartz (Gossan/Iron Hat)
CuFeS2 (Chalcopyrite) with SiO2 (Quartz)
mineral
Gold Nugget
Native Gold (Au)
mineral
Mother of Pearl and Onyx
Aragonite (Mother of Pearl) and Chalcedony (Onyx)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
mineral
Kimberlite
Kimberlite (Potassic ultramafic volcanic rock)
igneous
Precious Coral
Corallium rubrum (Calcium carbonate with trace carotene)
Organic gemstone / Sedimentary mineraloid
Citrine (Heat-treated Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
Diamond (in jewelry)
Carbon (C)
mineral
Agate (Moss or Lake Superior type)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Quartz (Milky or Cloudy Quartz)
Silicon Dioxide (SiO2)
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Pumice
Pumice (volcanic glass froth)
igneous
Quartz (Milky/Clear Variety)
Silicon Dioxide (SiO2)
mineral