Graphite
Graphite (Native Carbon), Formula: C
Metamorphic
Category
Sedimentary (Artificial)
Browse sedimentary (artificial) specimens identified by the Rock Identifier community.
Hematite
Iron(III) oxide (Fe2O3)
mineral
Gneiss
Gneiss (Metamorphic rock composed primarily of quartz, feldspar, and mica)
metamorphic
Almandine Garnet
Almandine (Fe3Al2Si3O12)
mineral
Pyrite (Iron Pyrites)
Iron Sulfide (FeS2)
mineral
Jasper (Chert)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Optical Calcite (Iceland Spar)
Calcite (Calcium Carbonate, CaCO3)
mineral
Quartz (Milky or White Quartz)
Silicon Dioxide (SiO2)
mineral
Rhodonite
Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3
mineral
Biotite Schist with Garnet
Garnet-Biotite Schist
metamorphic
Common Opal
Hydrated amorphous form of silica (SiO2·nH2O)
mineral
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fossil Coral
Cnidaria Anthozoa (Fossilized)
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Chalcedony (Quartz Var.)
Silicon Dioxide (SiO2)
mineral
Celestine (Celestite)
Strontium Sulfate (SrSO4)
mineral
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Limonite (Iron Stone/Goethite)
Limonite (mixture of hydrated iron oxides, primarily Goethite: α-FeO(OH))
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Amber (Copal)
Fossilized Tree Resin (C10H16O)
mineral
Epidote-bearing Granite (Unakite-like)
Epidotized Granite
igneous
Pyrite in Quartz
Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)
Mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Banded Slate (Lithified Mudstone)
Low-grade Metamorphosed Mudstone / Slate
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Druzy Quartz (on Quartzite or Chert)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Herkimer Diamond
Quartz (Silica - SiO2)
mineral
Milky Quartz (Druzy Geode fragment)
Silicon Dioxide (SiO2)
mineral
Brachiopod Fossil (Spiriferid)
Order Spiriferida (Phylum Brachiopoda); mineralized as Calcite (CaCO3) or Chert (SiO2)
sedimentary (fossilized organic remain)
Quartz Geode
Silicon Dioxide (SiO2) in a Secondary Sedimentary/Volcanic cavity
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Travertine (used in construction, not a 'specimen' in situ)
Travertine
Sedimentary
Polished Jasper (Mushroom Carving)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Jasper (Cream/Yellow variety)
Jasper (Microcrystalline Quartz, SiO2)
sedimentary
Brown Agate
Silicon Dioxide (SiO2)
mineral