Chert (specifically Tan/Brown Chert)
Chert (SiO2)
Category
Browse mineral like industrial smelting waste specimens identified by the Rock Identifier community.
Chert (specifically Tan/Brown Chert)
Chert (SiO2)
Cobalt Glass Slug (Man-made Glass)
Amorphous Silica with Cobalt Oxide (SiO2 + CoO)
Pegmatite
Igneous Pegmatite
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
Likely pink-orange calcite (rough specimen)
Calcite, calcium carbonate (CaCO₃)
Ruby (Raw Corundum)
Al2O3 (Aluminum Oxide)
Native copper-bearing rock
Native copper (Cu), likely with copper oxides/carbonates in a host rock
Granitic Pegmatite with Schorl Tourmaline
Granitic Pegmatite (Schorl: NaFe3Al6(BO3)3Si6O18(OH)4)
Ironstone Nodule
Ironstone (Ferruginous Rock)
Fluorite (Purple/Blue variety)
Calcium Fluoride (CaF2)
Fluorite
Calcium Fluoride (CaF2)
Pegmatite (Granitic)
Granite Pegmatite
Quartz with Iron Oxide
SiO2
Limonite (Iron Ore)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
Metal Alloy (Likely Pewter or Sterling Silver)
Not a natural geological specimen; composed of refined metals. If pewter, it's a tin-based alloy. If sterling silver, it's 92.5% silver and 7.5% other metals (usually copper).
Granitic Pegmatite
Pegmatitic Granite
Pegmatite
Pegmatite (felsic intrusive igneous rock)
Massive Milky Quartz (with Iron Inclusions)
Quartz (Silicon Dioxide, SiO2)
Limonite (Iron Ore)
Limonite (an FeO(OH)·nH2O mineraloid, not a true mineral due to variable composition)
White Marble
Recrystallized Calcite (CaCO3)
Pegmatite
Igneous Pegmatite
Sandstone
Arenite (SiO2 primarily)
Quartz (Iron-Stained)
Crystalline Silicon Dioxide (SiO2)
Granitic Pegmatite with Tourmaline/Chlorite
Pegmatite
Calcite
Calcium carbonate (CaCO3)
Limonite (Iron Ore)
Hydrated ferric oxide mixture (FeO(OH)·nH2O)
Wavellite with Quartz
Al3(PO4)2(OH,F)3 & SiO2
Schist
Mica Schist
Pegmatite
Igneous Pegmatite
Mica Schist
Muscovite/Biotite Schist
Fluorite
Calcium Fluoride (CaF2)
Clear quartz crystal
Quartz (silicon dioxide, SiO₂)
Quartz with Muscovite Mica
SiO2 with KAl2(AlSi3O10)(OH)2
Garnet
Garnet Group (Silicate Minerals), formula varies e.g., Alm: Fe3Al2(SiO4)3
Silicon
Element Si
Limonite / Ironstone
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
Red Garnet (Pyrope or Almandine)
Garnet Group (A3B2(SiO4)3)
Pegmatite
Igneous Pegmatite
Native Copper in Matrix
Native Copper (Cu)
Asphalt (Bituminous Concrete)
Bituminous mix / Anthropogenic conglomerate
Quartz pebble
Silicon dioxide (SiO2)
Pegmatite
Granitic Pegmatite