Chalcedony (Agate)
Silicon Dioxide (SiO2)
Category
Browse mineral (specifically, a variety of the mineral species pyrope almandine garnet) specimens identified by the Rock Identifier community.
Chalcedony (Agate)
Silicon Dioxide (SiO2)
Granite (specifically Pink or Red Granite)
Phaneritic Felsic Igneous Rock (Granite)
Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
Mahogany Obsidian
Obsidian (Volcanic Glass) with Hematite/Magnetite inclusions
Puddingstone
Conglomerate (specifically a type of jasper conglomerate or quartz conglomerate)
Amethyst (Chevron or Banded variety)
Silicon Dioxide (SiO2) with iron impurities
Quartz (Milky/Smoky variety)
Silicon Dioxide (SiO2)
Amazonite (Green Feldspar)
Microcline (variety Amazonite), Chemical Formula: K(AlSi3O8)
Fossil Coral (Petoskey Stone or Favosites)
Favosites (specifically Hexagonaria percarinata if silica-replaced Michigan type)
Granite
Granite (Silicic Plutonic Rock)
Carnelian
Carnelian (variety of Chalcedony, SiO2)
Aquamarine
Aquamarine (Beryl variety); Be3Al2Si6O18
Amethyst
Amethyst (variety of Quartz, SiO2)
Agate
Agate (a variety of Chalcedony, SiO2)
Carnelian
Carnelian (variety of Chalcedony, SiO2)
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
Citrine
Quartz (SiO2) - variety Citrine
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
Carnelian
Carnelian (variety of Chalcedony, SiO2)
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
Carnelian
Carnelian (a variety of Chalcedony, SiO₂)
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
Sandstone (Quartz-rich)
Arenite (SiO2 based clastic rock)
Moonstone
Orthoclase Feldspar (KAlSi3O8)
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Banded Calcite (known as Mexican Onyx or Calcite Alabaster)
Calcium Carbonate (CaCO3)
Fancy Jasper
Silicon Dioxide (SiO2) with impurities
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Quartz (Milky/Macro-crystalline)
Silicon Dioxide (SiO2)
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Limestone with Chert Nodules
Sedimentary Calcium Carbonate (CaCO3) with Microcrystalline Silica (SiO2) inclusions
Dyed Imperial Jasper (Sea Sediment Jasper)
Silicon Dioxide (SiO2) - Impure Quartz/Chalcedony
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
Quartz (Milky or Smoky variety)
Silicon Dioxide (SiO2)
Calcite
Calcite (Mineral, Calcium Carbonate - CaCO3)
Banded Calcite (often sold as 'Green Onyx')
Calcite (Calcium Carbonate, CaCO3)
Quartz (Common Grains)
Silicon Dioxide (SiO2)
Leopard Skin Jasper
Chalcedony (cryptocrystalline quartz) with inclusions
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)