Granite
Granite (Felsic Intrusive Igneous Rock)
igneous
Category
Metamorphic Rock (Composed Of Multiple Minerals)
Browse metamorphic rock (composed of multiple minerals) specimens identified by the Rock Identifier community.
Granite
Granite (High-silica plutonic rock)
igneous
Geode (Unopened)
Silica-rich Concretion (primarily SiO2)
sedimentary
Olivine in Basalt (Peridotite Xenolith)
Forsterite-rich Olivine (Mg2SiO4) in Aphanitic Basalt
igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Basalt (Greenstone)
Amygdaloidal Basalt / Chloritized Basalt
Igneous
Blue Quartzite
Quartzite with inclusions (SiO2)
metamorphic
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Granite Pegmatite
Coarse-grained Granite (SiO2 - Aluminum and Alkalies)
igneous
Granodiorite
Granodiorite (Na,Ca)(Si,Al)4O8
igneous
Basalt with Iron Oxidation
Amygdaloidal Basalt (silicate rock primarily plagioclase, pyroxene, and olivine)
igneous
Sandstone (Quartz-rich)
Arenite (SiO2 based clastic rock)
sedimentary
Rock Crystal Quartz
Quartz (SiO₂)
Mineral
Quartz Pebble (Sea Glass-like Quartz)
Quartz (Silicon Dioxide - SiO2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Quartz / Quartzite
Silicon Dioxide (SiO2)
Mineral / Metamorphic
Blue Apatite
Chlorapatite / Fluorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Banded Agate (Tumbled)
Cryptocrystalline Quartz (SiO2)
mineral
Arkosic Sandstone (or Conglomeritic Sandstone fragment)
Arkose (rich in feldspar)
sedimentary
Granitic Pegmatite
Granitic Pegmatite with Quartz and Feldspar
igneous
Bull Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Serpentine
Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Quartz Geode (Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Mineral (variety of Quartz)
Nephrite Jade (River Cobble)
Nephrite (Silicate mineral: Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Jadeite Jade
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Flower Agate
Chalcedony (Silicon Dioxide, SiO2) with Opaque Spherulitic Inclusions
mineral
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz (likely milky quartz or a stained variety)
Silicon Dioxide (SiO₂)
Mineral
Muscovite Mica
Muscovite (Potassium Mica) KAl2(AlSi3O10)(OH)2
Mineral
Sandstone Beach Pebble
Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)
sedimentary
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Basalt
Basalt (Mafic Extrusive)
igneous
Bituminous Coal (with Anthracite or Vitrinite inclusion)
Organic-rich Sedimentary Rock (Carboniferous classification)
sedimentary
Quartz with Mica Schist (Pegmatite Specimen)
SiO2 (Silicon Dioxide) and Phyllosilicates (Biotite/Muscovite)
Igneous/Metamorphic Hybrid
Turquoise
Hydrated copper and aluminum phosphate (CuAl6(PO4)4(OH)8·4H2O)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Granite
Granite
igneous
Quartz (Milky/Crystal variety)
Silicon Dioxide (SiO2)
mineral
Vesicular Sandstone
Clastic Sedimentary Rock (Sandstone)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic