Synthetic Convention Badge (Plastic/PVC)
Polyvinyl Chloride (PVC) / Polycarbonate
mineraloid (synthetic)
Category
Anthropogenic (Man Made Material Processed By Nature)
Browse anthropogenic (man made material processed by nature) specimens identified by the Rock Identifier community.
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Dzi Bead (Agate Bead)
Cryptocrystalline Quartz (SiO2) - Chalcedony/Agate
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Likely galena-bearing ore specimen
Galena (PbS), possibly with quartz or calcite gangue
mineral
Red jasper-bearing breccia (probable)
Microcrystalline quartz (SiO₂) with iron-oxide coloration, in a brecciated host
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Tumbled amethyst
Quartz, purple variety; silicon dioxide (SiO₂), colored mainly by iron impurities and irradiation
mineral
Limestone
Limestone (CaCO3)
sedimentary
Banded Sandstone / Quartzite Pebble
Sedimentary quartz arenite with liesegang banding
sedimentary
Parti Sapphire
Corundum (Al2O3)
mineral
Granite
Granite
igneous
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineraloid
Tiger's Eye
Silicon Dioxide (SiO2) with Limonite/Goethite inclusions
mineral
Small rounded pebble
Indeterminate lithic grain; likely weathered sandstone, iron-stained quartz-rich rock, or a concretion
sedimentary
Quartz Pebble / River Siltstone
Silicon Dioxide (SiO2) / Fine-grained Sedimentary Rock
sedimentary
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Weathered, iron-stained quartz-rich pebble (uncertain identification)
Microcrystalline quartz, SiO₂, with iron-oxide/hydroxide staining and dark matrix inclusions
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Yellow faceted gemstone earrings, likely citrine or yellow beryl
Citrine: quartz, SiO₂; possible yellow beryl: Be₃Al₂Si₆O₁₈
gemstone
Pink Quartz Grains
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Chalk
Micrite (primarily Calcium Carbonate or CaCO3)
sedimentary
Pearl
Organic gemstone (Calcium carbonate - CaCO3)
mineral
Hag Stone
Perforated Sedimentary Rock (typically Chert or Limestone)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Gastropod shell fragment
Calcareous mollusk shell; primarily aragonite or calcite (CaCO₃)
fossil
Rounded brown-gray stone, possibly weathered conglomerate or sandstone
Indeterminate clastic sedimentary rock; likely poorly cemented sandstone/conglomerate
sedimentary
Rough amber-like brown mineral specimen
Uncertain from photograph; possibly iron-stained quartz, common opal, or resinous amber
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Red Jasper
Jasper (Silicon Dioxide) - SiO2
sedimentary
Blue Chalcedony Cube
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral