Granite
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Category
Sedimentary Or Metamorphic (Base Substrate)
Browse sedimentary or metamorphic (base substrate) specimens identified by the Rock Identifier community.
Granite
Granite (Phaneritic Quartz-Feldspar-Mica composite)
igneous
Basalt River Pebble
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Granite
Intrusive igneous rock (SiO2 rich)
igneous
Granite Pebble
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Basalt (River Stone)
Extrusive mafic igneous rock
igneous
Granite
Plutonic Igneous Rock (Granite)
igneous
Pink Granite
Phaneritic intrusive igneous rock (Felsic)
igneous
Granite
Phaneritic plutonic rock (SiO2 + Al2O3)
igneous
Basalt with vesicles (Amygdaloidal Basalt)
Amygdaloidal Basalt (predominantly Plagioclase and Pyroxene)
igneous
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)
igneous
Granite
Phaneritic Plutonic Felsic Rock
igneous
Andesite River Stones
Andesite
igneous
Granite (Weathered)
Grano-diorite / Granite (SiO2 rich intrusive rock)
igneous
Vesicular Basalt
Extrusive Mafic Igneous Rock (Vesicular Basalt)
igneous
Lepidolite on Pegmatite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2) in Granitic Pegmatite
igneous
Chalcopyrite
Chalcopyrite (CuFeS2)
Mineral
Quartz (beads)
SiO2 (Silicon Dioxide)
Mineral
Rhodonite
Manganese silicate (MnSiO3)
mineral
Mystic Topaz
Aluminum Silicate Fluoride Hydroxide (Al2SiO4(F,OH)2) with metallic film coating
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Gravel variety)
Silicon Dioxide (SiO2)
mineral
Druzy Quartz on Chert/Chalcedony
Silicon Dioxide (SiO2)
mineral
Moss Agate
Silicon dioxide (SiO2) with inclusions of hornblende or chlorite
mineral
Basalt Porphyry
Porphyritic Basalt
igneous
Slate with Red Sandstone Landscaping Rock
Foliated Pelitic Metamorphic Rock (Slate) and Ferruginous Sandstone
metamorphic and sedimentary
Gold Nugget Jewelry
Native Gold (Au)
mineral
Aquamarine
Aquamarine (Beryl variety) - Be3Al2(Si6O18)
mineral
Granite
Granite (Phaneritic intrusive igneous rock; primarily SiO2 and Al2O3)
igneous
Garnet (Red Garnet)
Garnet Group. The red varieties seen in jewelry are typically Almandine (Fe3Al2(SiO4)3), Pyrope (Mg3Al2(SiO4)3), or a mix of the two (pyrope-almandine series).
Mineral (specifically, a variety of the mineral species Pyrope-Almandine Garnet)
Asphalt Concrete
Bituminous Concrete / Asphaltic Composite
not a natural rock (man-made composite)
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
igneous
Granite
Phaneritic Plutonic Igneous Rock (Granite)
igneous
Granite
Granite (Phaneritic Quartz-Feldspar intrusive rock)
Igneous
Pink Granite
Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)
igneous
Blue Topaz
Al2SiO4(F,OH)2
mineral
Chalcedony or Chert/Jasper with secondary mineral staining
SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.
Mineral, potentially a rock with chalcedony/jasper.
Chert (Jasper or Flint variant)
Chert (composed of microcrystalline quartz, SiO2)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Pink Garnet in Matrix
Grossular or Almandine Garnet (X3Y2(SiO4)3)
metamorphic
Titanium Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral (man-enhanced)
Granite
Granite (Mainly Quartz SiO2, Feldspar KAlSi3O8, and Mica KAl2(AlSi3O10)(OH)2)
Igneous