Hand-Drawn Trading Card (Amateur Artwork)
Cellulose-based substrate with wax/graphite/ink deposit (n/a for minerals)
Organic/Synthetic Composite (Paper and Pigment)
Category
Man Made Composite
Browse man made composite specimens identified by the Rock Identifier community.
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Granite
Felsic Plutonic Rock (Granite)
igneous
Limonite (Iron Ore)
Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O)
Mineral
Sand dollar fossil
Clypeasteroida (echinoid test), commonly Clypeasteroides spp.
fossil
Weathered sandstone or iron-stained sedimentary rock
Quartz-rich clastic sandstone; exact identification requires testing
sedimentary
Iron-stained quartz-rich breccia (probable)
Hydrothermal quartz–iron oxide breccia; mainly SiO₂ quartz with iron oxides/hydroxides (hematite/goethite)
igneous
Seashell (Cone Snail Shell)
Conus sp. (Calcium Carbonate, CaCO3)
fossil
Vesicular basalt (likely weathered lava rock)
Vesicular basalt; primarily plagioclase feldspar, pyroxene, and volcanic glass, with possible iron-oxide alteration
igneous
Jasper (Mookaite style)
Jasper (Silica-rich Microcrystalline Quartz, SiO2)
sedimentary
Fossil Shark Tooth
Carcharodon carcharias (modern/recent) or similar Lamniform fossil
fossil
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Granite
Granite (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Granite (Fine-grained)
Phaneritic Felsic Igneous Rock
igneous
Pink Granite
Granite (Phaneritic Acid Igneous Rock)
igneous
Granite
Granite (a common rock type, not a single mineral species)
Igneous
Coral fossil (likely fossilized colonial coral)
Calcareous fossil coral; commonly *Scleractinia* or *Tabulate/ rugose coral* (identification requires close pore-pattern examination)
fossil
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Granite
Phaneritic intrusive igneous rock (approx. 70 percent SiO2)
igneous
Coarse Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Vesicular Basalt with Quartz/Chalcedony
Vesicular Basalt (primarily Plagioclase, Pyroxene, and Olivine with SiO2 infill)
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Pink chalcedony (likely agate/quartz geode fragment)
Microcrystalline quartz, SiO₂; chalcedony with possible iron-oxide inclusions
mineral
Red agate-like polished stone (likely dyed chalcedony)
Chalcedony, microcrystalline SiO₂; possibly dyed quartz or glass imitation
mineral
Weathered limestone
Calcite-rich limestone (predominantly CaCO₃)
sedimentary
Ferruginous Sandstone
Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Banded Gneiss
Gneiss (pronounced 'nice')
metamorphic
Tumbled chalcedony (likely carnelian or brown jasper)
Microcrystalline quartz, SiO₂; iron-bearing varieties may be called carnelian
mineral
Chalcedony (possibly lavender or gray agate)
Microcrystalline quartz, SiO₂; fibrous quartz aggregate
mineral
River Stone (likely Basalt or Gabro)
Mafic Igneous Rock
igneous
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Basalt Pebble
Mafic Igneous Rock (Basalt)
igneous
Granite
Granite (Phaneritic Acidic Igneous Rock)
igneous
Sandstone
Arenite (SiO2 based with mineral cement)
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Weathered granitic rock fragments
Granite, likely quartz–feldspar–mica aggregate
igneous
Clear quartz crystal pendant
Quartz (silicon dioxide, SiO₂)
mineral
Quartz-rich metamorphic rock, likely quartzite
Quartzite; predominantly crystalline SiO₂, with minor gray mica/graphite or accessory minerals
metamorphic