Wonderstone (Sandstone)
Liesegang Banded Sandstone (SiO2 dominated)
sedimentary
Category
Not A Natural Rock
Browse not a natural rock specimens identified by the Rock Identifier community.
Granite
Granite (Felsic Plutonic Rock)
igneous
Sandstone (specifically Arkose or Quartz Arenite)
Arenite (primarily SiO2 with possible Feldspar)
sedimentary
Chert Concretion (with typical hematite/limonite staining)
Sedimentary Concretion (SiO2 with FeO(OH)⋅nH2O)
sedimentary
Sandstone (likely Quartzose)
Arenite (primarily SiO2)
sedimentary
Blue Dyed Agate
Silicon Dioxide (SiO2)
mineral
Boulder Opal
Precious Opal in Ironstone (Amorphous Hydrated Silica, SiO2·nH2O)
Mineral
Sandstone Beach Pebble
Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)
sedimentary
Jasper in Quartz (River Cobble)
Silicon Dioxide (SiO2) with Ferric Iron inclusions
sedimentary
Carborundum (Silicon Carbide)
Silicon Carbide (SiC) / Moissanite (natural form)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminium phosphate)
mineral
Amethyst
SiO2 (Silicon Dioxide)
mineral
Amethyst
Silicon Dioxide (SiO2) with trace Iron impurities
mineral
Sandstone (Weathered Coastal Boulder)
Arenite (composed primarily of SiO2)
sedimentary
Quartz Geode (Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Yellow Quartz (Citrine/Yellow Jasper mix)
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Citrine Geode Fragment
Citrine (Silicon Dioxide with Iron Impurities), SiO2
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Crushed Limestone
Calcium Carbonate (CaCO3)
Sedimentary
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O
mineral
Chert (Jasper/Common Opal mix)
Microcrystalline Quartz (SiO2)
sedimentary
Pumice
Pumicite (Amorphous Volcanic Glass)
igneous
Basalt (River Pebble)
Mafic volcanic rock (primarily Plagioclase feldspar and Pyroxene)
igneous
Rough Emerald/Green Beryl
Beryl (Be3Al2(SiO3)6) with trace amounts of Chromium or Vanadium
mineral
Blue Sapphire
Corundum (Al2O3 - Aluminum Oxide)
mineral
Glauconitic Sandstone (Greensand)
Glauconitic Sandstone ((K, Na)(Fe3+, Al, Mg)2(Si, Al)4O10(OH)2)
sedimentary
Granite
Granite (Phaneritic igneous rock)
igneous
Sandstone
Sandstone (lithified quartz arenite, arkose, graywacke, etc. depending on composition)
Sedimentary Rock
Blue Chalcedony (Tumbled)
Silicon Dioxide (SiO2)
mineral
Goldstone (Synthetic Aventurescence Glass)
Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)
mineraloid / man-made material
Green Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Jasper Breccia
Brecciated Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
sedimentary
Citrine
SiO2 (Silicon Dioxide)
Mineral
Slate
Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)
metamorphic
Sandstone
Sandstone (lithified sand)
sedimentary
Picture Jasper
Silicified sedimentary or volcanic rock (primarily SiO2)
sedimentary
Pink Granite (Water-worn Cobble)
Phaneritic Felsic Intrusive Igneous Rock
igneous
Magnetite (potentially as a Lodestone or within Ironstone)
Magnetite (Fe3O4)
mineral
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Granitoid (Granite/Granodiorite)
Plutonic igneous rock (variable composition, primarily SiO2)
igneous
Amethyst (Faceted)
Amethyst (Silicon Dioxide with iron impurities, SiO2)
mineral