Wonderstone (Banded Rhyolite)
Rhyolite (Silicon Dioxide with Iron Oxide impurities)
igneous
Category
Sedimentary Rock (Specifically A Clastic Sedimentary Rock Formed Into A Cobble)
Browse sedimentary rock (specifically a clastic sedimentary rock formed into a cobble) specimens identified by the Rock Identifier community.
Boxwork Siderite or Sepatarian Nodule Weathering
Siderite (FeCO3) with secondary mineralization or Boxwork Geode fragment
sedimentary
Chalcedony (Botryoidal)
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Geode (unopened)
Calcedony-lined Geode (SiO2)
sedimentary
Bauxite
Bauxite (Mixture including Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))
sedimentary
Chalcedony (Common Opal variant or Agate)
Silicon Dioxide (SiO2)
mineral
Granite Gneiss with Garnet
Garnetiferous Gneiss
metamorphic
Limestone with Quartz/Calcite Veins
Sedimentary Limestone (CaCO3 with SiO2 or CaCO3 intrusions)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Milky Quartz
Silicon Dioxide (SiO₂)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) - Opaque variety of Chalcedony/Quartz
sedimentary
Quartz (Milky or White Quartz)
Silicon Dioxide (SiO2)
mineral
N/A (This is a digital image of a bar graph)
Digital Data Visualization (Bar Chart)
This is not a rock or mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Gneiss
Gneiss
metamorphic
Unknown Organic Object (likely a berry or fruit)
Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.
Organic Material (likely a fruit or berry)
Concretion (Sandstone)
Carbonate-cemented Sandstone Concretion
sedimentary
Jasper and Agate
Microcrystalline Quartz (SiO2)
sedimentary
Greywacke with Quartz Vein
Matrix: Impure Sandstone (SiO2 + varied clasts), Veins: Quartz (SiO2)
sedimentary
Chert (Chert Nodule in Limestone)
Microcrystalline Quartz (SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Jasper
Silicon Dioxide with iron inclusions (SiO2)
sedimentary
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Fossil Shark Tooth (Otodus obliquus)
Otodus obliquus; hydroxyapatite (mineralized form Ca5(PO4)3(OH))
sedimentary (fossiliferous)
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions
sedimentary
Chalcedony (Botryoidal/Agate nodule)
Microcrystalline Quartz (SiO2)
mineral
Chert (Nodule)
Microcrystalline quartz (SiO2)
sedimentary
Dyed Agate (Tumbled)
Silicon Dioxide (SiO2) - stained microcrystalline quartz
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Quartz
Silicon dioxide (SiO2)
Mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Porphyry (specifically Porphyritic Basalt or Andesite)
Porphyritic extrusive igneous rock (Mg,Fe)2SiO4 (Olivine inclusions/Plagioclase Feldspar)
igneous
Chert (with Limestone matrix)
Chert (Silica: SiO2)
sedimentary
Pink Granite
Granite (Phaneritic igneous rock rich in Alkali Feldspar and Quartz)
igneous
Smoky Quartz and Biotite Schist
Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Pebble)
Quartz (SiO₂)
Mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Yellow Jasper / Chert
Silicon Dioxide (SiO2) with Goethite or Limonite inclusions
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
River Jasper (Chert/Chalcedony mix)
Silicon Dioxide (SiO2) with iron oxide and chlorite inclusions
sedimentary