Diorite with Quartz Veins
Diorite
igneous
Category
Mineral Based Composite
Browse mineral based composite specimens identified by the Rock Identifier community.
Learn about Mineral Based Composite in the encyclopedia
View all →
Fossilized Crab Carapace (Concretion)
Decapoda (fossil), typically preserved in calcite or siderite concretion
sedimentary
Blue Goldstone
Man-made glass with cobalt and metal flecks
man-made glass
Mosasaur Tooth Fossil
Mosasauridae (likely Prognathodon or Plioplatecarpus)
fossil
Bloodstone
Heliotrope (Silicon dioxide, SiO2)
mineral
Silicon Carbide (Carborundum)
Moissanite (SiC), though mostly synthetic
mineral
Heat-Treated Citrine (Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz-veined Sedimentary Rock
Hydrothermally veined Clastic Sedimentary Rock (SiO2 veins in Matrix)
sedimentary
Granite
Intrusive Phaneritic Felsic Igneous Rock
igneous
Sandstone with Iron Staining
Arenite (SiO2 with Fe-oxide coatings)
sedimentary
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Goethite/Limonite inclusions
mineral
Amethyst Cluster
Silicon Dioxide (Quartz variety: Amethyst) - SiO2
mineral
Sandstone (lithic/greywacke variety)
Arenite (composed primarily of SiO2 with various lithic fragments)
sedimentary
Milky Quartz Vein with Iron Staining
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
Igneous
Green Fuchsite and Quartz
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
metamorphic
Banded Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Amygdaloidal Basalt
Extrusive mafic igneous rock with amygdules
igneous
Granite
Granite (composed primarily of Quartz SiO2, Potassium Feldspar KAlSi3O8, and Plagioclase)
igneous
Fossil Shark Tooth
Carcharadon sp. (likely Carcharodon carcharias or similar Lamniformes)
fossil
Quartz Druzy on Matrix
Silicon Dioxide (SiO2)
mineral
Bloodstone
Chalcedony (Variety: Bloodstone / Heliotrope), SiO2
mineral
Basalt with Olivine (Peridot)
Basalt containing (Mg,Fe)2SiO4
igneous
Basalt with Amygdales
Amygdaloidal Basalt
igneous
Fuchsite
Chromian Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Granite
Phaneritic Plutonic Felsic Rock
igneous
Aura Quartz Bead
Silicon dioxide (SiO2) with metal coating
mineral with artificial coating
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Greenstone / Basalt
Aphanitic Mafic Igneous Rock (Metabasalt)
igneous
Yellow Topaz
Topaz - Al2SiO4(F,OH)2
gemstone
Peacock Ore
Bornite (Cu5FeS4) or iridescent Chalcopyrite (CuFeS2)
mineral
Aura Amethyst (Dyed/Coated)
Titanium-treated Silicon Dioxide (SiO2)
mineral
Slag
Metallurgical by-product
Anthropogenic (Man-made material)
Basalt River Cobble
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Granodiorite
Phaneritic intrusive igneous rock
igneous
Quartzwacke / Impure Sandstone
Arenite with minor lithic fragments (Silicon Dioxide matrix)
sedimentary
Jewelry Chain with Blue and Clear Gemstones (Likely Cubic Zirconia)
Cubic Zirconia (ZrO₂), Silver or White Gold/Platinum Alloy
Mineral (synthetic) and Metal (precious/base)
Granitic Pegmatite with Biotite
Pegmatitic Granite (contains KAlSi3O8, SiO2, K(Mg,Fe)3AlSi3O10(OH)2)
igneous
Granite
Intrusive igneous rock (Acidic)
igneous
Opalite
Synthetic Glass / Man-made Opal Simulant
gemstone
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz with Limonite/Goethite staining)
sedimentary