Hematite
Iron(III) oxide (Fe2O3)
mineral
Category
Mineral (Specifically, A Variety Of The Mineral Species Pyrope Almandine Garnet)
Browse mineral (specifically, a variety of the mineral species pyrope almandine garnet) specimens identified by the Rock Identifier community.
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and mineral impurities
sedimentary
Blue Lace Agate
Silicon Dioxide (SiO₂)
Mineral (Variety of Chalcedony/Quartz)
Basalt
Vesicular Basalt (Mafic volcanic rock)
Igneous
Sandstone (Water-worn Pebble)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Banded Gneiss
Gneiss (variable mineral composition)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Ruby (varieties of Corundum)
Aluminum oxide (Al2O3) with Chromium traces
mineral
Quartz
Silicon Dioxide (SiO₂)
Mineral
Amazonite
KAlSi3O8 (Potassium Aluminum Silicate) - a variety of Microcline Feldspar
mineral
Jasper
Silicon Dioxide (SiO2) - a variety of Chalcedony (Cryptocrystalline Quartz)
Mineral
Carnelian
Carnelian (a variety of Chalcedony, SiO2) colored by iron oxide
mineral
Sandstone (Red/Brown Variety)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Pink Opal / Peruvian Opal
Hydrated amorphous silicon dioxide (SiO2·nH2O)
Mineral
Sandstone
Clastic Sedimentary Rock (composed primarily of Quartz, SiO2)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Mineral
Agate (Bead Form)
Agate (Cryptocrystalline Quartz, SiO2)
mineral
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with goethite or limonite inclusions
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Quartz Sandstone)
Arenite (primarily SiO2)
sedimentary
Common Green Opal
Hydrated amorphous silicon dioxide (SiO2·nH2O)
mineral
Quartz
Quartz (SiO2)
Mineral
Blue Lace Agate
Chalcedony (a form of Quartz) - SiO2
Mineral
Chert (with Quartz Vein)
Chert (Siliceous sedimentary rock, predominantly Microcrystalline Quartz SiO2)
sedimentary
Quartz (River-worn Pebble)
Quartz (SiO2)
Mineral
Conglomerate
Clastic Sedimentary Conglomerate (SiO2, CaCO3, etc.)
sedimentary
Obsidian
Obsidian (principally SiO2)
igneous
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Chert (often called Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartz (Milky or Grainy Variety)
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Rose Quartz (SiO2 with traces of Ti, Fe, or Mn)
mineral
Jade (Nephrite or Jadeite)
Nephrite: Ca2(Mg,Fe)5Si8O22(OH)2 (amphibole mineral); Jadeite: NaAlSi2O6 (pyroxene mineral)
Metamorphic Rock / Mineral
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)
Mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Anthracite Coal
Anthracite (a variety of coal, predominantly carbon)
Sedimentary Rock (Metamorphosed)
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartz Geode
Silicon Dioxide (SiO2) in a concretionary structure
sedimentary
Dyed Agate Slice
Silicon Dioxide (SiO2) with artificial colorants
Mineral (variety of Chalcedony)