Pyrite
Iron Disulfide (FeS2)
Category
Browse mineral, often found in sedimentary deposits specimens identified by the Rock Identifier community.
Pyrite
Iron Disulfide (FeS2)
Copper-bearing Quartz (likely Malachite on Quartz matrix)
Cu2CO3(OH)2 (Malachite) on SiO2 (Quartz)
Petrified Wood
Silicified Wood (primarily Quartz/SiO2)
Howlite
Howlite (Calcium Borosilicate Hydroxide: Ca2B5SiO9(OH)5)
Fluorite Bracelet
Calcium Fluoride (CaF2)
Milky Quartz
Silicon Dioxide (SiO2)
Celestite
Celestine (SrSO4)
Chert (Flint)
Microcrystalline Quartz (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Magnetite
Magnetite (Fe3O4)
Red Jasper
Microcrystalline Quartz (SiO2) with iron oxide inclusions
Limonite/Goethite (Iron Ore)
Hydrous ferric oxides (FeO(OH)·nH2O)
Pyrite (on Shale/Matrix)
Iron Disulfide (FeS2)
Pyrite
Iron Sulfide (FeS2)
Quartz (Tumbled Peach/Pink Quartz)
Silicon Dioxide (SiO2)
Magnetite
Magnetite (Fe3O4)
Zebra Jasper
Tetragonal Silicon Dioxide (Quartz) with impurities
Yellow Quartz (Citrine / Milky Quartz)
Silicon Dioxide (SiO2)
Limonite with Trace Fossils
Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)
Yellow Calcite
Calcium Carbonate (CaCO3)
Limonite/Goethite Gossan
FeO(OH)·nH2O (Hydrated iron oxide)
Malachite
Copper(II) carbonate hydroxide [Cu2CO3(OH)2]
Satin Spar (Gypsum variety)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
Quartz Pebble
Silicon Dioxide (SiO2)
Rhodochrosite
Manganese carbonate (MnCO3)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
White Quartz (Milky Quartz)
Quartz (Silicon Dioxide - SiO2)
Fluorite
Calcium fluoride (CaF2)
Sandstone (River Cobble)
Sandstone (primarily composed of silica, SiO2)
Gold
Native Gold (Au)
Magnetite Sand (Black Sand)
Magnetite (Fe3O4)
Pyrite
Iron Pyrite (FeS2)
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite inclusions
Sphalerite
Zinc Sulfide (ZnS)
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
Green Calcite
Calcium Carbonate (CaCO3)
Limonite/Goethite Concretion
Hydrated Iron(III) Oxide-hydroxide (FeO(OH)·nH2O)
Yellow Chert or Jasper
Silicon Dioxide (SiO2)
Botryoidal Agate / Chalcedony Geode
Silicon Dioxide (SiO2)
Orange Calcite
Calcium Carbonate (CaCO3)
Orange Calcite
Calcium Carbonate (CaCO3)