Turquoise and Red Coral (with Grizzly Bear Claw)
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Precious Coral (Corallium rubrum)
Category
Browse mineral (specifically, a variety of the mineral species pyrope almandine garnet) specimens identified by the Rock Identifier community.
Turquoise and Red Coral (with Grizzly Bear Claw)
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Precious Coral (Corallium rubrum)
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions (SiO2)
Schist
Mica Schist (Composition typically involves Muscovite, Biotite, Quartz, and Feldspar)
Citrine
Silicon dioxide (SiO2)
Yellow Quartz (Citrine or Iron-Stained Quartz)
Silicon Dioxide (SiO2)
Citrine Quartz (likely heat-treated)
Silicon Dioxide (SiO2)
Banded Agate
Cryptocrystalline Quartz (SiO2)
Amazonite
K(AlSi3O8), Microcline (potassium feldspar)
Granite
Plutonic felsic igneous rock
Muscovite Schist
Muscovite Mica Schist (KAl2(AlSi3O10)(OH)2)
Pyrite
Iron Sulfide (FeS2)
Milky Quartz
Silicon Dioxide (SiO2)
Orange Calcite
Calcium Carbonate (CaCO3)
Fire Opal (in Matrix)
Hydrated Silica (SiO2·nH2O)
Banded Agate (specifically Moss or River Agate variety)
Cryptocrystalline Quartz (SiO2)
Banded Agate (specifically Red Agate or Sardonyx variety)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
Mica Schist
Mica Schist
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
Sandstone (Micaceous/Feldspathic variant)
Arenite (specifically subarkose or lithic arenite)
Satin Spar (Gypsum)
Hydrous Calcium Sulfate (CaSO4·2H2O)
Yellow Quartz (Chalcedony/Agate)
Silicon Dioxide (SiO2)
Blue Sapphire
Corundum (Al2O3 with trace Titanium/Iron)
Arid Sandy Loam
Arenosols / Regosols
Banded Agate with Druzy Quartz
Agate (Silicon Dioxide - SiO2)
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
Moss Agate
Silicon Dioxide (SiO2) with inclusions
Agate Geode
Banded Chalcedony (Silicon Dioxide, SiO2) with Quartz crystals
Flower Agate (Plume Agate)
Chalcedony (Silicon Dioxide) with Spherulitic Inclusions - SiO2
Ruby
Corundum (Al2O3 with Chromium traces)
Aventurine (Green Quartz)
Silicon Dioxide (SiO2) with inclusions of Fuchsite (Mica)
Kyanite
Kyanite (Al2SiO5)
Banded Agate (specifically Botryoidal/Orbicular Agate)
Silicon Dioxide (SiO2)
Mahogany Obsidian
Obsidian (SiO2 + Fe2O3)
Ferruginous Sandstone
Sandstone with iron oxide (Hematite/Limonite) cement
N/A (This is a digital image of a bar graph)
Digital Data Visualization (Bar Chart)
Emerald / Green Beryl
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
Rough Quartz in Pegmatite Matrix
Quartz (Silicon Dioxide - SiO2) in Granitic Pegmatite
Jasper (specifically Red Jasper)
Silicon Dioxide with Iron Oxides (SiO2 + Fe2O3)
Beach Pebble (likely Quartz or Chalcedony)
Silicon Dioxide (SiO2)
Yellow Quartz (Citrine or Iron-Stained Quartz)
Silicon Dioxide (SiO2)
Smoky Quartz
Silicon Dioxide (SiO2)
Citrine Quartz
Silicon Dioxide (SiO2)