Green Aventurine
Aventurine (a variety of Quartz, SiO2)
Mineral
Category
Metamorphic (Likely Gneiss Or Schist Based On Texture)
Browse metamorphic (likely gneiss or schist based on texture) specimens identified by the Rock Identifier community.
Pink Granite
Felsic Plutonic Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)
igneous
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chalcedony (specifically Agate or Flint)
Silicon Dioxide (SiO₂)
Mineral
Basalt (Vesicular)
Extrusive mafic igneous rock
igneous
Sandstone (Ferruginous)
Arenite (SiO2 with Iron Oxide impurities)
sedimentary
Peacock Ore (Bornite or Chalcopyrite treated with acid)
Bornite (Cu5FeS4) or Acid-washed Chalcopyrite (CuFeS2)
mineral
Blue Quartz with Dumortierite/Magnesio-riebeckite inclusions
Quartz (SiO2) containing Dumortierite (Al7(BO3)(SiO4)3O3)
igneous/metamorphic
Asphalt (Bituminous Concrete)
Composite material (bitumen binder with mineral aggregate)
man-made rock (technosol)
Granite
Granite (High-silica plutonic rock)
igneous
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Porphyritic Basalt (likely Chinese Writing Stone)
Porphyritic Basalt / Plagioclase Feldspar in Basal Matrix
igneous
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
mineral (silicate-replaced organic material)
Quartzite (River Pebble)
Quartzite (composed primarily of Silica, SiO2)
metamorphic
Banded Chert or Chert with Quartz Veins
Chert (SiO2)
Sedimentary
Amazonite
K(AlSi3O8) - Lead-bearing Microcline (Potassium Feldspar)
Mineral
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Goldstone
Avventurina (Cu + SiO2 glass)
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (complex silicate composition with iron oxides)
sedimentary
Jasper or Chert with Quartz Vugs
Silicon Dioxide (SiO2)
sedimentary
Basalt
Basalt (dominated by plagioclase feldspar and pyroxene)
igneous
Metal Alloy (Jewelry)
Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.
Man-made Material (jewelry, metal alloy)
River Rock (Basalt)
Aphanitic Basaltic Rock
igneous
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Garden Quartz (Lodolite)
Quartz with inclusions (SiO2 + various inclusions such as Chlorite, Hematite, or Feldspar)
mineral
Granite
Granite (Alkali-feldspar, Quartz, and Plagioclase composition)
igneous
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Chalcedony (Botryoidal/Agate nodule)
Microcrystalline Quartz (SiO2)
mineral
Chert (Iron-stained)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Granite Cobble
Granite (Felsic Plutonic Rock)
igneous
Sandstone
Arenite (primarily SiO2 with iron oxide cementation)
sedimentary
Red Jasper (River Pebble)
Silicon Dioxide (SiO2) with hematite impurities
sedimentary (microcrystalline quartz)
Clear Quartz (Rock Crystal Fragments)
Silicon Dioxide (SiO2)
mineral
Quartz (specifically Milky Quartz/Quartzite)
Silicon Dioxide (SiO2)
Mineral
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2
metamorphic
Granite (with mafic xenolith)
Phaneritic Felsic Plutonic Rock
Igneous
Greenstone
Metamorphosed Mafic Igneous Rock
metamorphic
Sandstone Cobble
Clastic Sedimentary (Sandstone)
sedimentary
Sandstone (Greywacke)
Clastic Sedimentary Rock (SiO2 with lithic fragments)
sedimentary
Slag (Industrial Glass Slag)
Amorphous Silicate Glass (often containing Al, Ca, Mg, and Ti oxides)
Mineraloid (Industrial byproduct)