Rutilated Quartz
SiO2 (Quartz) with TiO2 (Rutile inclusions)
Mineral
Category
Sedimentary (Processed Mineral Product)
Browse sedimentary (processed mineral product) specimens identified by the Rock Identifier community.
Ferruginous Siltstone or Mudstone
Ferruginous Siltstone / Goethitic Sandstone
sedimentary
Sulfur
Native Sulfur (S8)
mineral
Sandstone (Ferruginous)
Arenite (iron-rich)
sedimentary
Peridotite
Ultramafic intrusive rock (Peridotite)
Igneous
Porphyritic Rhyolite (Red Porphyry)
Porphyritic Rhyolite (Felsic volcanic rock)
igneous
Quartzite Pebbles
Quartzite (primarily SiO2)
metamorphic
Yellow Quartzite (River Pebble)
Metamorphic Quartzite (SiO2)
metamorphic
Carnelian
Carnelian (SiO2 variant)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Gold
Native Gold (Au)
mineral
Chalcedony (Tumbled)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Common Opal variant or Chert/Flint)
Silicon Dioxide (SiO2)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Milky Quartz (Ferruginous variety)
Silicon Dioxide (SiO2)
mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Chalcedony (Quartz variety)
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz (Milky/Common Quartz)
Silicon Dioxide (SiO2)
mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Sandstone with Ironstone Banding
Clastic Sandstone (composed of Quartz with Hematite/Limonite bonding)
sedimentary
Obsidian
Obsidian (volcanic glass), predominantly amorphous SiO₂
Igneous
Banded Sandstone
Arenite with Liesegang banding (primarily SiO2 with FeO(OH) impurities)
sedimentary
Shale
Argillaceous Rock
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Cloudy Quartz)
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Quartz Geode (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
Sandstone
Arenite (Siliclastic sedimentary rock, primarily SiO2)
sedimentary
Gneiss
Gneiss
metamorphic
Pyrite in Shaly Matrix
Iron Sulfide (FeS2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) within a secondary sedimentary structure
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary