Granite
Granite
igneous
Category
Mineral (Man Modified)
Browse mineral (man modified) specimens identified by the Rock Identifier community.
Chert (Nodular Chert)
Microcrystalline Silica (SiO2)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
Mineral (Variety of Chalcedony)
Quartzite River Rock with Dendrites
Metamorphosed Quartz-rich Sandstone with Manganese Oxide (MnO2) inclusions
metamorphic
Kyanite (in Schist Matrix)
Kyanite (Al2SiO5)
metamorphic
Jasper with Agate and Quartz Inclusions
Silicon Dioxide (SiO2) - Chalcedony / Quartz aggregate
sedimentary
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Sandstone (Quartz Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Pebble/Cobble)
Arenite (primarily SiO2)
sedimentary
Fuchsite (Green Muscovite in Quartz)
K(Al,Cr)2(AlSi3O10)(OH)2 - Chromium-rich Muscovite
metamorphic
Verde Antique Marble (Serpentinite)
Serpentinite (composed mainly of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
Banded Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Jasper (specifically Fancy Jasper or Bloodstone variety)
Silicon Dioxide (SiO2) with impurities (Iron oxides/silicates)
sedimentary
Fancy Jasper (Multicolor Agate/Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Snowflake Obsidian
Vitreous volcanic silicate (SiO2 with Cristobalite inclusions)
Igneous
Basalt (Vesicular)
Extrusive mafic igneous rock; primarily (Mg, Fe)2SiO4 (Olivine), CaAl2Si2O8 (Plagioclase Feldspar), and Pyroxene
igneous
Sandstone Clast
Arenite (primarily SiO2)
sedimentary
Chert (Nodule)
Silicon dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Ruby in Fuchsite (often sold as Ruby in Zoisite)
Corundum (Al2O3) in Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Serpentinite
Serpentinite (complex silicate minerals including Mg3Si2O5(OH)4)
metamorphic
Greenstone / Serpentinite
Serpentinite (composed largely of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Turquoise
Hydrated phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O
mineral
Diamond
Diamond (Carbon, C)
mineral
Dendritic Agate (or Dendritic Opal)
SiO2 (for Agate), SiO2·nH2O (for Opal)
Mineral
Hematite (beads)
Hematite (Fe₂O₃)
Mineral
Rose Quartz
Rose Quartz (SiO2)
Mineral
Azurite and Malachite on Matrix
Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2
mineral
Agate (specifically, likely a geode slice or nodule)
Agate (a variety of Chalcedony, with chemical formula SiO2)
Mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Diamond
Diamond (C)
Mineral
Rose Quartz
SiO2 (Silicon Dioxide)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Soapstone / Steatite
Steatite (primarily Talc, Mg3Si4O10(OH)2)
metamorphic
Quartzite
Quartzite (Primary mineral: Quartz, SiO2)
metamorphic
Pearl (likely Freshwater or Akoya Cultured)
Aragonite / Conchiolin composite (CaCO3)
Mineralloid (Organic gemstone)
Yellow Quartz (Citrine Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Rutilated Quartz
Quartz with Rutile Inclusions (SiO2 with TiO2 inclusions)
Mineral
Red Garnet
Pyrope-Almandine series (Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3)
mineral
Rose Quartz
Rose Quartz (SiO₂)
Mineral