Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Category
Sedimentary (Fossilized Organic Remains)
Browse sedimentary (fossilized organic remains) specimens identified by the Rock Identifier community.
Milky Quartz (Ferruginous variety)
Silicon Dioxide (SiO2)
mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Hematite (Oolitic or Earthy variety)
Iron(III) oxide (Fe2O3)
mineral
Chalcedony (Quartz variety)
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Garnet in Schist (Polished Tower)
Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist
metamorphic
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Almandine Garnet in Matrix
Almandine, Fe3Al2(SiO4)3
metamorphic
Muscovite Schist with Quartz
Mica Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Green Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Rhodonite (in matrix)
Rhodonite (Mn,Fe,Mg,Ca)SiO3
Mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Carnelian
Carnelian (Silicon Dioxide - SiO2)
mineral
Geode (Unopened)
Siliceous Concretion / Geode
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Pyrulite (Pyrite / Chalcopyrite)
Iron Sulfide (FeS2) or Copper Iron Sulfide (CuFeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Grey Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Common Quartz)
Silicon Dioxide (SiO2)
mineral
Gypsum Wallboard (Drywall)
Hydrous calcium sulfate (CaSO4·2H2O)
sedimentary (processed mineral product)
Quartz
Silicon Dioxide (SiO2)
mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Gneiss
Gneiss
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Cinnabar
Mercury(II) sulfide (HgS)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Jasper (Green/Dragon Blood variety)
Silicon Dioxide (SiO2) with iron/clay inclusions
sedimentary
Banded Calcite (often sold as 'Ocean Jasper' or 'Caribbean Calcite' variant)
Calcium Carbonate (CaCO3) with potential Aragonite inclusions
Sedimentary
Jasper or Chalcedony
Microcrystalline Quartz (SiO2)
sedimentary
Limonite (Iron Ore Congcretion)
Limonite (a mixture of hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)
mineral