Black Jasper with Quartz
Silicon Dioxide (SiO2) with impurities
sedimentary
Category
Mineral (Man Made Glass, Not Natural)
Browse mineral (man made glass, not natural) specimens identified by the Rock Identifier community.
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Peacock Ore (Bornite or Chalcopyrite treated with acid)
Bornite (Cu5FeS4) or Acid-washed Chalcopyrite (CuFeS2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone
Arenite (primarily Quartz-rich)
sedimentary
Sandstone
Arenite
sedimentary
Polished red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
mineral
Gold Nugget
Native Gold (Au)
mineral
Quartz (likely) or a Quartzite Pebble
Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.
Mineral, specifically a detrital grain
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous copper aluminium phosphate)
mineral
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Quartz Pebble / Quartzite Pebble
SiO2 (Silicon Dioxide)
sedimentary
Amygdaloidal Basalt
Basalt with secondary mineral infilling
igneous
Sandstone (Wonderstone)
Silicified Sandstone / Orthoquartzite with Liesegang rings
sedimentary
Iron-rich slag or limonite-bearing rock
Hydrated iron oxides, chiefly limonite/goethite (FeO(OH)·nH₂O); possibly industrial iron slag
mineral
Sandstone (Heart-shaped pebble)
Sedimentary Quartz Sandstone
sedimentary
Iron-rich weathered rock, likely limonite/goethite-bearing laterite
Limonite (variable hydrated iron oxides; chiefly goethite, α-FeO(OH))
mineral
Rough Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz (Polished)
Silicon Dioxide (SiO2)
mineral
Dyed Howlite (Turquenite)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Dyed Quartz Crystal
Silicon Dioxide (SiO2) with artificial pigment
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) containing iron impurities and irradiation
mineral
Smoky Quartz (with complementary stones in jewelry setting)
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
mineral
Red Tiger's Eye
SiO2 (Silicon Dioxide with iron inclusions)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Iron-stained sandstone or weathered ironstone concretion
Quartz-rich sandstone, locally cemented by iron oxides (hematite/goethite); exact identification requires testing
sedimentary
Dyed Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in sedimentary host rock
sedimentary
Gravel and Pavement Aggregates
Unconsolidated rock fragments / detrital sediments
sedimentary
Granite
Granite (Felsic Intrusive Igneous Rock)
igneous
Granite
Granite (composed primarily of Quartz SiO2, Feldspar KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8, and Mica)
Igneous
Pink Granite
Granite (Phaneritic igneous rock rich in Alkali Feldspar)
igneous
Heated Citrine (Heat-Treated Amethyst)
Silicon Dioxide (SiO2), quartz variety
mineral
Diamond
Carbon (C)
mineral