Petrified Wood
Silicified Wood (SiO2)
Category
Browse sedimentary or metamorphic derived specimens identified by the Rock Identifier community.
Petrified Wood
Silicified Wood (SiO2)
Carnelian Agate
Silicon Dioxide (SiO2)
Citrine Quartz
Crystalline Quartz (SiO2 with iron impurities)
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
Banded Agate
Agate (Cryptocrystalline variety of Quartz, SiO2)
Smoky Quartz
Silicon Dioxide (SiO₂)
Green Tourmaline
Elbaite - Na(Li1.5Al1.5)Al6Si6O18(BO3)3(OH)4
Black Tourmaline
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide)
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
River Quartz Pitting/Cobble
Silicon Dioxide (SiO2)
Smoky Quartz
Smoky Quartz (SiO2: Silicon Dioxide)
Smoky Quartz (Tumbled)
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Chalcopyrite in Quartz (Gold Ore Matrix)
CuFeS2 (Chalcopyrite) with SiO2 (Quartz)
Smoky Quartz
SiO2 (Silicon Dioxide)
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
Smoky Quartz
Silicon Dioxide (SiO2)
Sunstone
Oligoclase (Feldspar variety), (Na,Ca)(Si,Al)4O8
Milky Quartz
Silicon Dioxide (SiO2)
Smoky Quartz
Silicon Dioxide (SiO2)
Quartz (possibly Citrine or Smoky Quartz variety)
Silicon Dioxide (SiO2)
Agate
Agate (Silicon Dioxide, SiO2)
Rhodonite
Manganese Silicate (Mn, Fe, Mg, Ca)SiO3
Quartzite River Pebble
Quartzite (principally SiO2)
Quartzite river stone
Quartzite (SiO2)
Quartzite (River Pebble)
Metamorphosed Sandstone (SiO2)
Quartzite Pebble
Quartzite (primarily SiO2)
Quartz
Silicon Dioxide (SiO2)
Tourmaline (likely Schorl)
Tourmaline Group Mineral (e.g., Schorl for black varieties); (Na,Ca)(Li,Mg,Fe,Mn,Al)3Al6(BO3)3Si6O18(OH)4
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
Quartzite / Sandstone / Chert Mix
Silicon Dioxide (SiO2)
Pyrite
Iron Disulfide (FeS2)
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
Quartz (Milky or Rough Variety)
Silicon Dioxide (SiO2)
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
Petrified Wood
Silicified Wood (SiO2)
Magnetite
Magnetite (Fe3O4)
Pyrite
Iron Disulfide (FeS2)
Milky Quartz
Silicon dioxide (SiO2)
Orange Calcite
Calcite (CaCO3)