Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Category
Mineral Like Byproduct (Technogenic)
Browse mineral like byproduct (technogenic) specimens identified by the Rock Identifier community.
Sandstone (likely Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Phantom Quartz with Chlorite and Hematite inclusions
Silicon Dioxide (SiO2) with inclusions of Chlorite group minerals and Hematite (Fe2O3)
mineral
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Red Sandstone (Iron-Rich)
Arenite (Fe2O3)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Phaneritic Plutonic Igneous Rock (primarily composed of quartz, alkali feldspar, and plagioclase)
igneous
Brachiopod Fossil (Spiriferid)
Order Spiriferida (Phylum Brachiopoda); mineralized as Calcite (CaCO3) or Chert (SiO2)
sedimentary (fossilized organic remain)
Vesicular Basalt
Basalt with secondary mineral infilling (Amygdaloidal Basalt)
igneous
Dendritic Agate (or Dendritic Opal)
SiO2 (for Agate), SiO2·nH2O (for Opal)
Mineral
Ironstone Concretion
Limonitic/Hematitic Concretion
sedimentary
Dendritic Limestone
Calcite with Manganese Oxide (Manganese Dendrites)
sedimentary
Sandstone
Sandstone (principally SiO2)
sedimentary
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Gneiss
Gneiss (high-grade metamorphic rock)
metamorphic
Limonite (Ironstone)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Jasper
Silicon Dioxide (SiO2)
sedimentary
Quartz Druzy Geode
Silicon Dioxide (SiO2) - Crystalline Variety
mineral
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Strawberry Quartz
Quartz (SiO2) with inclusions of Goethite or Hematite
Mineral
Banded Gneiss (River Cobble)
Gneiss (a high-grade metamorphic rock)
metamorphic
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Blue Lace Agate (Geode/Druzy variant)
Chalcedony (SiO2) with Quartz druzy
mineral
Limonite with Iron Inclusions
Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O)
sedimentary
Pink Thulite (in Pumice-like texture)
Pink Zoisite (Mn-bearing Zoisite), Ca2Al3(SiO4)3(OH)
metamorphic
Purple Lepidolite with Quartz
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Yellow Ochre / Limonite
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Blue Goldstone
Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)
man-made glass
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Granite
Granite
Igneous
Dendritic Agate / Moss Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Obsidian (Black)
Obsidian (High-silica volcanic glass)
igneous
Fluorite (Green Fluorite)
Fluorite (Calcium Fluoride, CaF2)
mineral
Amygdaloidal Rhyolite
Rhyolite (felsic volcanic rock) with amygdules
igneous
Nuummite
Nuummite (intergrowth of orthoamphiboles Anthophyllite and Gedrite, (Mg,Fe)7Si8O22(OH)2)
metamorphic
Fossiliferous Rock (likely Dinosaur Fossil in Matrix)
Permineralized Vertebrate Fossil (Calcium Carbonate/Silica replaced bone material)
sedimentary