Orange Calcite
Calcium Carbonate (CaCO3)
Category
Browse metamorphic, likely sedimentary with quartz veins specimens identified by the Rock Identifier community.
Orange Calcite
Calcium Carbonate (CaCO3)
Green Opal
Hydrated Silica (SiO2·nH2O)
Sandstone with Ironstone Banding
Clastic Sandstone (composed of Quartz with Hematite/Limonite bonding)
Milky Quartz
Silicon Dioxide (SiO2)
Smoky Quartz
Silicon Dioxide (SiO2)
Citrine
Citrine (Silicon Dioxide, SiO2)
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Pyrite in Matrix (Fool's Gold)
Iron Disulfide (FeS2)
Milky Quartz / Rose Quartz fragment
Silicon Dioxide (SiO2)
Quartzite
Quartzite (SiO2)
Kyanite in Quartz
Kyanite (Al2SiO5) with Quartz (SiO2) matrix
Chert (Yellow/Tan Variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Agate (specifically Carnelian Agate or Lake Superior style Agate)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
Chert (often called Flint or River Stone)
Chert (SiO2)
Fluorite with Rhodochrosite
Fluorite (CaF2) and Rhodochrosite (MnCO3)
Clear Quartz
Silicon Dioxide (SiO2) / Rock Crystal
Jasper
Jasper (Silicon Dioxide, SiO2)
Pyrite
Pyrite (FeS₂)
Citrine
Silicon Dioxide (SiO2) with iron impurities
Gneiss
Gneiss (High-grade Metamorphic Rock)
Pink Quartzite
Quartzite (SiO2 with iron oxide inclusions)
Quartz (specifically Milky Quartz or Quartzite)
Silicon Dioxide (SiO2)
Tiger's Eye (likely Hawk's Eye variant)
Pseudomorph of Quartz after Crocidolite (SiO2)
Rhodonite
Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
Optical Calcite (Iceland Spar)
Calcite (Calcium Carbonate, CaCO3)
Magnetite / Iron Ore
Magnetite (Fe3O4)
Pyrite
Iron Disulfide (FeS2)
Ferruginous Quartzite (also known as Ironstone or Gossan)
Ferruginous Quartzite with Goethite/Hematite staining
Amethyst and Ruby in Zoisite
Silicon Dioxide (SiO2) and Anyolite (Zoisite-Hornblende-Ruby mix)
Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 predominantly)
Smoky Quartz
Silicon Dioxide (SiO2)
Chlorite Included Quartz
Silicon Dioxide (SiO2) with Chlorite (Mg,Fe,Li)6AlSi3O10(OH)8
Chert (Jasper-like)
SiO2 (Cryptocrystalline Quartz)
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
Mica Schist (with Muscovite)
Muscovite/Quartz Schist (KAl2(AlSi3O10)(OH)2)
Muscovite Schist with Quartz
KAl2(AlSi3O10)(OH)2 in Schistose matrix
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
Sandstone Beach Pebble
Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)