Peridotite
Peridotite (Ultramafic Rock)
igneous
Category
Mineral, Possibly Rock Fragment Containing A Mineral
Browse mineral, possibly rock fragment containing a mineral specimens identified by the Rock Identifier community.
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Schist
Mica Schist
metamorphic
Asphalt (Bituminous Pavement Bit)
Bitumen-bound aggregate (Petrochemical-bound composite)
sedimentary (anthropogenic/technogenic)
Granite
Granite (Felsic Plutonic Rock / SiO2 + Al2O3 + K2O + Na2O + CaO + FeO + MgO)
igneous
Conglomerate
Conglomerate (Rock composed predominantly of rounded clasts > 2mm)
sedimentary
Amber
Organic gemstone (Succinite)
mineral
Banded Gneiss (Variety of Gneiss)
Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)
Metamorphic Rock
Amber
Succinite (fossilized resin); C10H16O
mineraloid
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Green Moss Agate
Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite
sedimentary
Slag
Ferrous Slag (Amorphous calcium-magnesium-aluminum silicates)
igneous (artificial/anthropogenic)
Scoria (Red Lava Rock)
Scoria (Vesicular basaltic rock)
Igneous
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Biogenic Inclusions
sedimentary
Lapis Lazuli
Lapis Lazuli (Rock containing Lazurite, Calcite, and Pyrite)
metamorphic
Limestone with Weathering Rind
Calcium Carbonate (CaCO3) - Bioclastic or Micritic Limestone
sedimentary
Amethyst Geode (polished heart-cut)
Silicon Dioxide (SiO2) with iron impurities
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Serpentinite (Serpentine Rock)
Primarily composed of serpentine group minerals, such as antigorite, chrysotile, and lizardite. Chemical formula for serpentine minerals is (Mg,Fe)3Si2O5(OH)4.
Metamorphic
Pink Granite
Granite (Felsic Plutonic Rock)
igneous
Snowflake Obsidian
Spherulitic Obsidian (Amorphous volcanic glass with Phenocrysts of Cristobalite)
igneous
Banded River Rock / Gneiss (highly weathered)
Gneiss
Metamorphic rock
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
sedimentary
K2 Jasper (Beads)
Granodiorite with Azurite and Malachite
igneous
Granitic Pegmatite
Coarse-grained Granite (KAlSi3O8 + SiO2)
igneous
Jasper Breccia
Brecciated Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
sedimentary
Obsidian
Obsidian (principally SiO2)
igneous
Red Jasper with Quartz Veining
Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron Oxide impurities (Hematite)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)
metamorphic
Amber
Succinite (C10H16O)
mineraloid
Slate
Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)
metamorphic
Seashell Fragment (Aragonite/Calcite)
Calcium Carbonate (CaCO3) - Shell fragment
sedimentary
Porphyritic Basalt
Porphyritic Fine-grained Mafic Volcanic Rock
igneous
Granodiorite / Granite
Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)
igneous
Kambaba Jasper
Stromatolite (Fossilized Algae)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Orbicular Rhyolite (Rainforest Jasper)
Rhyolite containing Spherulites (SiO2 with impurities)
igneous
Quartz
Silicon Dioxide (SiO2)
Mineral
Sandstone
Arenite
sedimentary
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Sandstone (Water-worn Cobble)
Arenite (SiO2 based)
sedimentary
Terrazzo (Man-made Composite)
Cementitious or Resin-bound Lithic Composite
sedimentary (artificial)