Yellow Ochre / Limonite
Limonite (FeO(OH)·nH2O)
Mineral
Category
Mineral Based Human Made Alloy
Browse mineral based human made alloy specimens identified by the Rock Identifier community.
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Limonite (Iron Stone/Gossen)
Limonite (FeO(OH)·nH2O)
mineral
Nephrite Jade
Nephrite
Mineral/Rock
Sandstone
Arenite
sedimentary
Bituminous Coal (with Anthracite or Vitrinite inclusion)
Organic-rich Sedimentary Rock (Carboniferous classification)
sedimentary
Blue Cracked Quartz (Dyed Fire Crackle Quartz)
Silicon Dioxide (SiO2) with synthetic dye
mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
mineral
Rough Diamond
Diamond (pure Carbon, C)
mineral
Natural Pearl (appearing in a jewelry setting)
Calcium Carbonate (mostly Aragonite), CaCO3 with Conchiolin
mineral
Chert / Flint
Cryptocrystalline quartz (SiO2)
Sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Granite
Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)
igneous
Chert (variant of Flint)
Chert (SiO2)
Sedimentary
Diamond in Kimberlite
Diamond in Kimberlite Matrix (Diamond: C, Kimberlite: complex Potassic Peridotite)
igneous
Mother of Pearl (Nacre)
Aragonite (CaCO3) with Organic Matrix
mineral
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite
sedimentary
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Opalite
Synthetically produced glass (Silicon Dioxide with metallic inclusions)
Mineraloid (Man-made Glass)
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Silver (Native Silver Mineral)
Ag (Native Silver), Alloyed 90% Ag / 10% Cu
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Gold flakes
Native Gold (Au)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Cullet (Slag Glass)
Amorphous Silica (SiO2) with various metal oxide colorants
mineraloid / anthropogenic
Diorite (Gneissic)
Diorite
igneous
Sandstone (specifically Arkose or Quartz Arenite)
Arenite (primarily SiO2 with possible Feldspar)
sedimentary
Hematite Beads
Hematite (Fe2O3)
Mineral
Limonite (Oxidized Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Nacre (Mother of Pearl)
Nacre (Biogenic Aragonite/Calcite composite, CaCO3)
mineral
Diamond (in jewelry setting)
Carbon (C)
mineral
Diamond (in jewelry setting)
Adamantine Carbon (C)
mineral
Ferruginous Sandstone (Ironstone)
Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Limonite and Goethite on Gossan
FeO(OH)·nH2O
mineral
Granite
Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)
igneous
Native Gold Nuggets
Native Gold (Au)
mineral
Limonite/Goethite Nodule
Iron Oxyhydroxide (primarily FeO(OH)·nH2O)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert (specifically Flint or Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (with Liesegang rings or joints)
Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)
sedimentary
Blue Quartz (Aventurine)
Silicon Dioxide (SiO2) with fibrous inclusions (commonly Dumortierite)
mineral