Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Category
Mineral Based Human Made Alloy
Browse mineral based human made alloy specimens identified by the Rock Identifier community.
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Native Copper in Matrix
Native Copper (Cu)
mineral
Hematite
Hematite, Iron(III) oxide (Fe2O3)
mineral
Yellow Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
mineral
Basalt with Plagioclase Phenocrysts
Porphyritic Basalt (primarily SiO2, MgO, FeO, and CaO)
Igneous
Sandstone Pebble
Sandstone (Quartzose/Feldspathic Sandstone)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Mother of Pearl (Nacre)
Calcium Carbonate (primarily aragonite, with conchiolin)
Organic Gemstone/Biomineral
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Green variety)
Microcrystalline Opaline/Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (variations include Flint/Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
mineral
Dragon Blood Jasper (Epidote with Piedmontite or Quartz)
Epidote-rich Quartzite / SiO2 with (Ca2(Al2,Fe)(Si2O7)(SiO4)O(OH))
metamorphic
Basalt with Sulfide/Pyrite inclusion
Aphanitic Mafic Igneous Rock (likely Basalt) with Pyrite (FeS2)
igneous
Porphyritic Andesite
Andesite
igneous
Crushed Granite Gravel
Granite (Plagioclase feldspar, Quartz, Alkali feldspar, Biotite)
igneous
Amygdaloidal Basalt with Secondary Minerals
Basalt containing secondary mineralization (likely Chlorite, Celadonite, or Zeolites)
igneous
White Topaz
Aluminum Silicate Fluoride Hydroxide, Al2SiO4(F,OH)2
mineral
White Topaz
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
mineral
White Topaz
Topaz - Al2SiO4(F,OH)2
mineral
Sandstone (with manganese staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Quartz in Basalt (Xenocryst)
Silicon Dioxide (SiO2) in Mafic Igneous Volcanic Rock
Igneous
Granite
Phaneritic Plutonic Felsic Rock (KAlSi3O8 + SiO2 + NaAlSi3O8)
igneous
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Lepidolite
K(Li,Al)3(Si,Al)4O10(F,OH)2
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Dark gray weathered pebble, likely basalt
Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides
igneous
Basalt with Epidote Veining
Basalt (Mafic Extrusive Rock) with Ca2(Al,Fe)3(SiO4)3(OH)
igneous
Basalt
Aphanitic Mafic Igneous Rock
igneous
Banded Gneiss
Banded Gneiss (High-grade Metamorphic Rock)
metamorphic
Moss Agate
Silicon dioxide (SiO2) with inclusions
Mineral
Earthy Hematite / Goethite Surface
Iron Oxide (Fe2O3 – α-FeO(OH))
mineral
Mica Schist
Mica Schist (primarily Muscovite and Biotite)
metamorphic
Chalcedony with Quartz Crystals
Silicon Dioxide (SiO2)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Bloodstone
Heliotrope (Cryptocrystalline Quartz, SiO2)
mineral
Limestone with Iron Inclusions
Calcium Carbonate (CaCO3) with Hematite/Limonite
sedimentary
Quartzite with Mica / Gneiss Pebble
Metamorphic Rock (Quartz-Feldspar-Mica aggregate)
metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous