Peacock Ore (Chalcopyrite)
Chalcopyrite (CuFeS2)
mineral
Category
Synthetic Or Natural Fiber
Browse synthetic or natural fiber specimens identified by the Rock Identifier community.
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Golden Healer Quartz
Ferruginous Quartz (SiO2 with Fe2O3 inclusions)
mineral
Strawberry Quartz (Hematoid Quartz)
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
mineral
Pumice
Pumicite (Amorphous Volcanic Glass)
igneous
Concrete Fragment
Hardened Portland Cement Composite
Anthropogenic (Man-made material mimicking sedimentary rock)
Amber
Succinite (Organic Mineraloid) - C10H16O
mineral
Green Quartz (Prasiolite)
Crystalline Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon dioxide (SiO2) with iron impurities
mineral
Blue Howlite (Dyed)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Breciated Chert
Silicon Dioxide (SiO2) with Clastic Structure
sedimentary
Aventurine
Silicon Dioxide (SiO2) with inclusions
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Agate
Silicon dioxide (SiO2) - variety Chalcedony
mineral
Agate
Agate (Silicon Dioxide, SiO2)
mineral
Limestone (River Pebble)
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
mineral
Carnelian Agate
Silicon Dioxide (SiO2) with Iron Oxide impurities
mineral
Moonstone
Orthoclase Feldspar (formula: (K,Na)AlSi3O8)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
mineral
Pink Granite
Granite (Felsic Plutonic Rock)
igneous
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)
metamorphic
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous
Smoky Quartz (Rough Specimen)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Carnelian (a variety of Chalcedony)
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Beach Pebble (Basalt/Greywacke)
Amygdaloidal Basalt
igneous
Chrysoberyl (Cyclic Twin)
Beryllium Aluminum Oxide (BeAl2O4)
mineral
Sandstone Beach Pebble
Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)
sedimentary
Blue Quartz (specifically Dumortierite Quartz)
SiO2 (Silicon Dioxide) with inclusions of AlAl6BSi3O18 (Dumortierite)
mineral
Blue Lace Agate (often dyed)
Silicon dioxide (SiO2) - variety of chalcedony
mineral
Amethyst (Faceted)
Amethyst (Silicon Dioxide with iron impurities, SiO2)
mineral
Quartz Crystal (specifically a Double-Terminated variety)
Silicon Dioxide (SiO2) - Low Quartz
mineral
Dyed Quartz Geode
Silicon Dioxide (SiO2) with artificial pigment
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
mineral
River Quartzite or Chert Pebble
Quartzite (primarily Silicon Dioxide - SiO2)
metamorphic
Grey River Pebble (Likely Quartz-rich or Limestone)
Clastic Sedimentary Rock (typically SiO2 or CaCO3 based)
sedimentary
Corundum (Ruby/Sapphire crystal)
Al2O3 (Aluminum Oxide)
mineral
Fluorite Octahedron
Fluorite (Calcium Fluoride, CaF2)
mineral