Hematite
Iron(III) oxide (Fe2O3)
mineral
Category
Mineral Or Sedimentary Rock (With Mineral Inclusions)
Browse mineral or sedimentary rock (with mineral inclusions) specimens identified by the Rock Identifier community.
Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2 - Muscovite component)
metamorphic
Sandstone (Micaceous/Feldspathic variant)
Arenite (specifically subarkose or lithic arenite)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
Mineral/Sedimentary
Not a rock, mineral, or geological specimen
N/A
Rose Quartz
Rose Quartz (SiO2 with traces of Ti, Fe, or Mn)
mineral
Blue Quartz (Blue Aventurine)
Silicon Dioxide (SiO2) with inclusions (typically crocidolite or dumortierite)
mineral
Pink Quartz (Rose Quartz)
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Sandstone (Ferruginous)
Arenite (Fe-bearing Clastic Sedimentary Rock)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)
Quartz (SiO₂)
Mineral
Blue Dumortierite Quartz
AlAl6BSi3O18 (Dumortierite) within SiO2 (Quartz)
mineral
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Jasper with Agate and Quartz Inclusions
Silicon Dioxide (SiO2) - Chalcedony / Quartz aggregate
sedimentary
Druzy Quartz on Agate/Chert
Silicon Dioxide (SiO2)
mineral
Foliated Gneiss (River-Worn Pebble)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Peridot
Olivine (specific variety: gem-quality forsterite), (Mg,Fe)2SiO4
Mineral
Rock Salt / Halite Crust
Halite (Sodium Chloride, NaCl)
sedimentary
Sandstone Pebble with Iron Staining
Clastic Sedimentary Rock (primarily Quartz with Fe2O3 oxides)
sedimentary
Quartz Pebble (Geode-like)
Silicon Dioxide (SiO2)
Mineral
Carnelian (Agate)
SiO2 (Silicon Dioxide with Iron Oxide impurities)
mineral
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
mineral
Mica Schist
Mica Schist (predominantly Muscovite or Biotite)
metamorphic
Barite Rose (Desert Rose)
Barium Sulfate (BaSO4)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Sedimentary or Igneous Matrix
igneous
Basalt
Basalt (dominated by plagioclase feldspar and pyroxene)
igneous
Red Sandstone
Clastic sedimentary rock (primarily Quartz and Feldspar with Iron Oxide cement)
sedimentary
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
Weathered Volcanic Rock (possibly Rhyolite or Andesite Pebble)
Volcanic rock (e.g., Rhyolite or Andesite, specific identification would require thin section analysis or chemical assay). Mineral composition: Primarily feldspars (orthoclase and/or plagioclase), quartz (in rhyolite), micas, amphiboles, and sometimes pyroxenes.
Igneous, specifically volcanic/extrusive (possibly Rhyolite or Andesite)
Milky Quartz
Quartz (SiO₂)
Mineral
Amber
Amber (Fossilized Tree Resin)
Mineral
Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
mineral
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
mineral
Moss Agate
Silicon Dioxide (SiO2) with Chlorite/Oxide inclusions
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Rutilated Quartz
Quartz (SiO2) with Rutile Inclusions (TiO2)
Mineral
Green Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite mica)
metamorphic