Limonite (Iron Ore)
Hydrous Iron Oxide (goethite, lepidocrocite)
Category
Browse man made rock (technosol) specimens identified by the Rock Identifier community.
Limonite (Iron Ore)
Hydrous Iron Oxide (goethite, lepidocrocite)
Sea Glass
Amorphous silicon dioxide (glass)
Obsidian
Volcanic Glass (SiO2)
Sandstone
Arenite
Marble
Marble (metamorphosed limestone or dolostone), primarily composed of calcite (CaCO3) or dolomite (CaMg(CO3)2)
Quartzite
Metamorphic Quartz Sandstone
Quartzite
Metamorphic Quartzite (SiO2)
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
Sea Glass
Amorphous Silica (Glass) SiO2
Synthetic Costume Accessory (Non-Geological)
Polyester and Acrylic Fiber (Anthropogenic polymer)
Sea Glass (Cobalt Blue)
Amorphous Silica (Glass with Cobalt additives)
Blue Goldstone
Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)
Porcelain (Kaolin-based)
Alumina silicate ceramic (composed primarily of Kaolinite: Al2Si2O5(OH)4)
Blue Slag Glass
Ferro-silicate glass (Slag)
Brecciated jasper (likely red-and-cream jasper)
Jasper, an opaque microcrystalline variety of quartz; primarily cryptocrystalline SiO₂ with iron-oxide staining and possible chalcedony/quartz veining
Quartzite
Metamorphic Quartzite (SiO2)
Chalcedony (Agate / Jasper Specimen)
Silicon Dioxide (SiO2)
Chert / Flint
Microcrystalline Quartz (SiO2)
Flint
SiO2 (Cryptocrystalline Quartz)
Chert / Flint
Silicon Dioxide (SiO2)
Brecciated Jasper
Brecciated Jasper (Microcrystalline Quartz / SiO2)
Green Aventurine
Silicon Dioxide (SiO2+KAl2(AlSi3O10)(OH)2)
Gabbro
Gabbro (Mg, Fe)2Si2O6 / (Ca, Na)(Al, Si)4O8
Chert (with Quartz)
Microcrystalline Quartz (SiO2)
Diamond (in Jewelry)
Carbon (C)
Quartz
Silicon dioxide (SiO₂)
Blue-green chrysocolla rough specimen
Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite
Tumbled blue-green stone, likely chrysocolla or dyed chalcedony
Probable chrysocolla (hydrated copper aluminosilicate; variable composition), though appearance could also represent dyed chalcedony
Tumbled chalcedony (likely moss or dendritic agate)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions
Quartzite
Metamorphic Quartzite
Green Quartzite
Metamorphic Quartz Sandstone (SiO2)
Red Quartzite
Quartzite (Metamorphosed Quartz Arenite)
Diamond
Carbon (C)
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
Chert (Flint)
Silicon Dioxide (SiO2)
Chert
Chert (SiO2)
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Obsidian
Obsidian (volcanic glass)
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
Bog Iron / Limonite Concretion
Goethite/Limonite mixture (FeO(OH)·nH2O)
Turquoise
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
Obsidian
Volcanic glass (SiO2)