Granite
Granite (Phaneritic Quartz-Feldspar rock)
igneous
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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Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Worn quartz-rich pebble, likely chert or quartzite
Microcrystalline quartz (SiO₂), possibly quartzite
sedimentary or metamorphic
Granite
Phaneritic Plutonic Felsic Rock
igneous
Rough Diamond
Diamond (pure Carbon, C)
mineral
Pearl
Calcium Carbonate (CaCO3) with Conchiolin
mineral
Diamond (in a jewelry setting)
Cubic Carbon (C)
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Weathered iron-rich rock, possibly limonite-bearing sandstone
Limonite/goethite mixture, approximately hydrated iron oxides (FeO(OH)·nH₂O), possibly coating sandstone or ironstone
mineral
Mixed tumbled gemstone collection
Varied minerals, likely including amethyst, sodalite/lapis lazuli, quartzite or aventurine, jasper, and agate/chalcedony
gemstone
Flagstone
Sedimentary Sandstone / Flagstone
sedimentary
Blue Lace Agate (Heat-treated/Crackle Quartz variety)
Silicon Dioxide (SiO2)
mineral
Dark glassy pebble, possibly volcanic rock
Likely basalt or volcanic glass (var. obsidian), unconfirmed from image
igneous
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Peacock Ore
Bornite (Cu5FeS4)
mineral
Chert (specifically White Chert or Novaculite)
Silicon Dioxide (SiO₂)
sedimentary
Magnetite
Iron(II,III) oxide (Fe3O4)
mineral
Bismuth
Bismuth (Bi)
mineral
Granite
Granite (Mainly Quartz SiO2, Alkali Feldspar (K,Na)AlSi3O8, and Plagioclase Feldspar)
igneous
Diamond
Native Carbon (C)
mineral
Sandstone (Feldspathic / Arkose)
Sandstone (SiO2 with variable mineral grains)
sedimentary
Dyed Howlite (often sold as 'Turquenite')
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Fossil tooth, possibly shark tooth
Indeterminate fossilized vertebrate tooth; likely a shark tooth (possibly *Carcharhinus* or related genus)
fossil
Amethyst
Quartz (Silicon Dioxide with iron impurities), SiO2
mineral
Pumice
Pumice (Highly vesicular volcanic glass)
igneous
Pumice
Vesicular volcanic glass (primarily SiO2)
igneous
Sandstone (likely Graywacke or Siltstone variety)
Clastic Sedimentary Rock (SiO2 with assorted mineral fragments)
sedimentary
Limonite (Iron Ore)
Hydrous Iron Oxide (goethite, lepidocrocite)
Mineral
Flint
Silicon Dioxide (SiO2) - Chert variety
sedimentary
Polished orbicular granite (likely larvikite or orbicular diorite)
Quartz/feldspar-bearing granitoid with dark amphibole–biotite minerals; exact variety requires testing
igneous
Rough turquoise-bearing rock (probable turquoise matrix)
Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O, likely in a host-rock matrix
mineral
Sandstone pebble
Sandstone (SiO2 with iron oxides)
sedimentary
Rose Quartz Carving
Quartum roseum (Variety of Quartz, SiO2)
Mineral
Quartz (various varieties)
SiO₂ (Silicon Dioxide)
Mineral
Limonite (Iron Ore)
Limonite (mixed iron hydroxides, primarily FeO(OH)·nH2O)
mineral
Banded Chert / Cryptocrystalline Quartz
Silicon Dioxide (SiO2)
sedimentary
Pumice
Pumice (Amorphous silicate glass with trapped gas bubbles)
igneous
Polished blue agate/geode slice
Chalcedony (microcrystalline quartz, SiO₂), likely dyed blue
mineral
Agate
Silicon Dioxide (SiO2)
mineral
Emerald (Tumbled Beryl)
Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Diamond (in a Gold Jewelry Setting)
Carbon (C)
mineral
Likely yellow chalcedony or citrine cabochon
Cryptocrystalline quartz (chalcedony), SiO₂; alternatively quartz variety citrine
gemstone