Granite
Phaneritic Plutonic Igneous Rock (composed of Quartz, Feldspar, and Mica)
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 →
Graywacke
Graywacke Sandstone
sedimentary
Citrine (Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Botryoidal or Agate nodule)
Silicon Dioxide (SiO2)
mineral
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Granite Pegmatite with Muscovite Mica
Granite Pegmatite (Silicon Dioxide and complex silicates)
igneous
Muscovite Mica
Muscovite - KAl2(AlSi3O10)(F,OH)2
mineral
Bloodstone
Heliotrope (cryptocrystalline Quartz SiO2 with Hematite inclusions)
mineral
Bloodstone (Heliotrope)
Silicon Dioxide (SiO2) with inclusions of Hematite or Iron oxide
mineral
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Diorite (Dalmatian Stone)
Intermediate Phaneritic Igneous Rock
igneous
Diorite
Diorite
igneous
Granite
Phaneritic Plutonic Felsic Rock (KAlSi3O8 - SiO2 - NaAlSi3O8)
igneous
Bumblebee Jasper
Hydrothermal Volcanic Rock (Primarily Calcite with Orpiment - As2S3, Realgar, and Pyrite)
igneous
Chert (Sedimentary Rock)
Silicon Dioxide (SiO2)
sedimentary
Vesicular Basalt
Vesicular Basalt
igneous
Bumble Bee Jasper
Volcanic Tuff (mixture of SiO2, CaCo3, S, and As2S3)
igneous
Quartz with Mica (Pegmatite)
Quartz (SiO2) and Muscovite (KAl2(AlSi3O10)(OH)2)
igneous
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Basalt Pebble
Basalt (Mafic Igneous Rock)
igneous
Granular Sandstone
Arenite (variable composition, primarily SiO2)
sedimentary
Mahogany Obsidian
Obsidian (Volcanic Glass with Hematite/Magnetite inclusions), SiO2
igneous
Dyed Howlite (simulating Lavender/Purple Jade or Charoite)
Howlite: Ca2B5SiO9(OH)5 (when natural)
Mineral
Jasper River Stone
Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)
sedimentary
Fossilized Coral (Petoskey Stone precursor)
Hexagonaria percarinata (Fossilized Rugose Coral)
fossil
Fossilized Shark Tooth
Carcharocles sp. or similar Lamniformes
fossil
Sandstone (Ferruginous)
Arenite (Fe-bearing Clastic Sedimentary Rock)
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with Iron Oxide impurities)
sedimentary
Conglomerate
Conglomerate (Rock composed predominantly of rounded clasts > 2mm)
sedimentary
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Banded Gneiss
Metamorphic Gneiss
metamorphic
Sandstone Pebble
Sandstone (Quartz-rich Arenite)
sedimentary
Sandstone (lithic wacke/arenite)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Chert (within Limestone)
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) matrix
sedimentary
Sandstone (with manganese staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (complex silicate composition with iron oxides)
sedimentary
Iron Slag
Iron/Steel Slag (Ferrosilicate Glass)
industrial byproduct (anthropogenic material)
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Schist
Mica Schist
metamorphic
Biotite / Black Mica
K(Mg,Fe)3(AlSi3O10)(F,OH)2
mineral