Red Garnet
Pyrope-Almandine series (Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3)
mineral
Category
Igneous, Sedimentary, And Metamorphic Mix
Browse igneous, sedimentary, and metamorphic mix specimens identified by the Rock Identifier community.
Smoky Quartz (Vein Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Baroque Pearl (and potentially a small Sapphire/Blue Topaz)
Pearl: Calcium Carbonate (aragonite or calcite) with conchiolin. Sapphire: Aluminum Oxide (Al2O3). Blue Topaz: Al2SiO4(F,OH)2.
Organic Gemstone (for pearl), Mineral (for sapphire/topaz)
Banded Gneiss (Variety of Gneiss)
Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)
Metamorphic Rock
Quartz (Crystal/Druzy Quartz)
Quartz (SiO₂)
Mineral
Granitic Gneiss
Felsic Polycrystalline Gneiss
metamorphic
Green Aventurine
Silicon Dioxide (Quartz) with inclusions of Fuchsite mica (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Dragon Blood Jasper
Epidote with Red Jasper (Quartz-rich aggregate)
sedimentary
Anthracite Coal
Anthracite
sedimentary
Banded Agate (with possible Chalcedony layers)
Silicon dioxide (SiO2)
sedimentary
Milky Quartz with Country Rock contact
Silicon Dioxide (SiO2) in contact with Metamorphic/Igneous rock
mineral
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic
Yellow Quartzite River Cobble
Meta-quartzite (SiO2 with iron oxide staining)
metamorphic
Orange Quartzite (River Pebble)
Quartzite (primarily SiO2)
metamorphic
Mica Schist
Mica Schist (predominantly Muscovite/Biotite)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Garnet Schist
Almandine Garnet-Mica Schist (X₃Y₂(SiO₄)₃)
metamorphic
Tiger Iron
Tiger Iron (A complex combination of Hematite Fe2O3, Red Jasper SiO2, and Tiger's Eye SiO2/FeOOH)
metamorphic
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
Mineral
Dalmation Stone (Dyed)
Peralkaline rhyolite
igneous
Aquamarine
Beryl (Be3Al2Si6O18)
Mineral
Chalcedony (Agate/Carnelian variant)
Cryptocrystalline Silica (SiO2)
mineral
Yellow Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Quartz (Agate or Chert pebble)
Silicon Dioxide (SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Native Gold
Native Gold (Au)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Yellow Chalcedony (common opal or chert variant)
Silicon Dioxide (SiO2)
sedimentary (mineraloid/microcrystalline quartz)
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Chalcedony (Grey/White Agate)
Silicon Dioxide (SiO₂)
mineral
Heliotrope (Bloodstone)
Cryptocrystalline Quartz (SiO2) with inclusions of Hematite (Fe2O3)
mineral
Opal
Hydrated Silica (SiO2·nH2O)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Pyrite (Iron Pyrite)
Iron Disulfide (FeS2)
mineral
Chalcedony (Smoky Quartz or Agate nodule fragment)
Silicon Dioxide (SiO2)
mineral
Agate (Carnelian-like)
Chalcedony (Silicon Dioxide, SiO2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
metamorphic