Limestone with Quartz or Calcite Veining
Calcium Carbonate (CaCO3) matrix with SiO2 or CaCO3 inclusions
sedimentary
Category
Metamorphic Rock (Primarily Composed Of Minerals)
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
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Sandstone
Clastic Sedimentary Rock (composed mostly of SiO2)
sedimentary
Marble (Sculculpted)
Metamorphosed Limestone (primarily CaCO3)
metamorphic
Tiger's Eye (specifically Blue/Golden mixed or Hawk's Eye)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Greenschist
Greenschist (Major minerals include Chlorite, Actinolite, and Epidote)
metamorphic
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Pyrite in Quartz
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
mineral
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Quartzite Pebble
Metamorphic Quartzite (primarily SiO2)
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Collection of Minerals and Ores
Various (e.g., Uraninite (U3O8), Carbon (C), Native Gold (Au), Hematite (Fe2O3), Galena (PbS), etc.)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Diabase
Diabase (also known as Dolerite)
igneous
Yellow Quartzite (Beach Pebble)
Quartzite (primarily SiO2)
metamorphic
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Unakite
Epidotized Granite
metamorphic
Gneiss (Granitic Gneiss)
Gneiss
metamorphic
Agate (or Chalcedony with Moss/Jasper Inclusions)
Silicon Dioxide (SiO2)
mineral
Yellow Quartzite (River Pebble)
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Chert (with Quartz Veining)
Microcrystalline Quartz (SiO2)
sedimentary
Almandine Garnet in Matrix
Almandine (Fe3Al2(SiO4)3)
metamorphic
Black Sand (Magnetite Sand)
Magnetite (Fe3O4)
mineral
Limonite with Quartz
FeO(OH)·nH2O (Limonite) with SiO2 (Quartz)
mineral
Quartzite with inclusions
Quartzite (primarily SiO2)
metamorphic
Granite (likely a river or beach pebble)
Granite (a felsic intrusive igneous rock primarily composed of quartz, feldspar, and mica)
Igneous
Snowflake Obsidian
Vitreous Silica with Spherulite inclusions (Amorphous SiO2)
igneous
Charoite
Charoite (Complex silicate mineral rock)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2) in Geodic habit
mineral
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Mineral
Coquina
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Aventurine
Aventurine Quartz (SiO2 with inclusions)
Mineral
Basalt
Mafic Volcanic Rock (composed of plagioclase, pyroxene, and olivine)
igneous
Yellow Aventurine (or Citrine-colored Quartz)
Silicon Dioxide (SiO2) with inclusions
metamorphic
Gneiss
Gneiss
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Red Sandstone
Arenic rock (composed mainly of SiO2 with Fe2O3)
sedimentary
Unakite
Unakite (Epidotized Granite)
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral