Basalt
Extrusive mafic igneous rock
igneous
Category
Metamorphic Rock (Composed Of Multiple Minerals)
Browse metamorphic rock (composed of multiple minerals) specimens identified by the Rock Identifier community.
Gneiss
Gneiss
metamorphic
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
metamorphic
Serpentine
Serpentine-group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4)
metamorphic
Sandstone
Clastic Sedimentary Rock (composed mostly of quartz, SiO2)
sedimentary
Labradorite (a variety of Feldspar)
Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)
igneous
Black Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Banded Gneiss
Gneiss (typically quartz, feldspar, mica, amphibole composition)
metamorphic
Sandstone (with Iron Staining)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Lapis Lazuli
Lapis Lazuli (a rock type, not a single mineral, composed primarily of lazurite, calcite, and pyrite)
Mineral, part of a rock
Biotite Mica
K(Mg,Fe)3AlSi3O10(OH)2
Mineral in a matrix (likely quartz or feldspar)
River Rock / Stream Pebble
Fluvial Clast / Rounded Sedimentary Particle
Sedimentary Rock (possibly composed of various minerals)
Specularite (Specular Hematite)
Iron Oxide (Fe2O3)
mineral
Granite
Granite (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Quartzite with Hematite
Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 inclusions)
metamorphic
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
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.
Orange Quartzite (River Pebble)
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Rhodonite
Manganese silicate (MnSiO3)
mineral
Mica Schist
Mica Schist (Composition typically includes Muscovite KAl2(AlSi3O10)(OH)2 and Quartz SiO2)
metamorphic
Coquina
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Quartz / Calcite Vein Rock
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)
mineral
Graphite-veined Quartzite
Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)
metamorphic
Fire Agate
SiO2 (Silicon Dioxide with Iron Oxide inclusions)
mineral
Zebra Rock / Zebra Marble
Banded Limestone-Marble Transition
metamorphic
Basalt
Basalt
igneous
Basalt
Basalt (principally Plagioclase and Pyroxene)
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Dragon Blood Jasper
Epidote with Red Jasper inclusions (SiO2 and Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Sandstone Pebbles
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Basalt
Basalt
igneous
Siltstone with Weathering Rind
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Mica Schist with Pyrite
Muscovite/Biotite Schist with Iron Sulfide (FeS2)
metamorphic
Carved Mottled Greenish-Yellow Crystal/Glass Object
Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.
Man-made Object/Uncertain Mineral
Quartz in Matrix (possibly with Biotite or Hornblende)
Quartz (Silicon Dioxide, SiO2) in Granitic Matrix
igneous
Jade
There are two distinct minerals commonly known as Jade: Jadeite (NaAlSi2O6) and Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2). Based on the appearance, these spheres are likely Nephrite.
Mineral
Quartz (vein quartz)
SiO2 (Silicon Dioxide)
Mineral
Rough Garnet in Matrix
Almandine Garnet (Fe3Al2Si3O12)
mineral
Andesite
Andesite (Intermediate Extrusive Volcanic Rock)
igneous
Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic