Milky Quartz (river pebble)
Quartz (Silicon Dioxide, SiO2)
Category
Browse not a geological specimen specimens identified by the Rock Identifier community.
Milky Quartz (river pebble)
Quartz (Silicon Dioxide, SiO2)
Grey Limestone Pebble
Limestone (Calcium Carbonate - CaCO3)
Granite
Phaneritic Felsic Igneous Rock
Gneiss
Metamorphic rock of high-grade regional metamorphism
Quartz (Iron-Stained Quartz Pebble)
Silicon Dioxide (SiO2)
Biotite (Black Mica)
Biotite [K(Mg,Fe)3(AlSi3O10)(F,OH)2]
Iron Gossan (Limonite/Goethite)
Hydrated Iron Oxides (FeO(OH)·nH2O) from oxidation zones
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Calcite
Calcium Carbonate (CaCO3)
Manganese-coated Sandstone
Clastic sedimentary rock with Manganese Oxide (often Pyrolusite or Psilomelane)
Ferruginous Conglomerate
Ferruginous Conglomerate (Clastic Sedimentary Rock)
Yellow Agate
Agate (Microcrystalline Silicon Dioxide, SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Optical Calcite (Iceland Spar)
Calcium Carbonate (CaCO3)
Petrified Wood
Silicified Wood (primarily SiO2)
Pyrite (on Quartz matrix)
Iron Sulfide (FeS2)
Basalt (Road Aggregate)
Basalt (Aphanitic Mafic Igneous Rock)
Amethyst
Silicon dioxide with iron impurities (SiO2)
Quartz Geode Fragment
Silicon Dioxide (SiO2)
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
Fossiliferous Limestone (Coquina)
Biogenic Limestone (Calcium Carbonate, CaCO3)
Red Sandstone
Arenite with Hematite cementation
Milky Quartz
Silicon Dioxide (SiO2)
Brecciated Chert
Brecciated Chert (Microcrystalline Quartz, SiO2)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Quartz (Iron-stained)
Silicon Dioxide (SiO2) with hematite/limonite inclusions
Gold Nugget
Native Gold (Au)
Jasper and Quartzite mix
Silicon Dioxide (SiO2) with impurities
Rough Quartz (likely Rose or Amethyst variety)
Silicon Dioxide (SiO2)
Chert (vuggy variety)
Microcrystalline silica (SiO2)
Ferrosilicon Slag (Industrial Vitrified Glass)
Vitreous Silicate Residue
Glauconitic Sandstone (Greensand pebble)
Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
Green Calcite
Calcite (CaCO3)
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
Cullet Glass (Man-made Glass Slag)
Amorphous Silica (SiO2) with chemical additives
Quartz Crystal Cluster
Quartz (Silicon Dioxide, SiO2)
Fluorite (Green Fluorite)
Fluorite (Calcium Fluoride, CaF2)
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(OH)2
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Pink Calcite (Mangano Calcite)
Calcium Carbonate (CaCO3)
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)