Jasper
Jasper (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Category
Man Made
Browse man made specimens identified by the Rock Identifier community.
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Quartz Vein in Host Rock (Gabbro or Basalt)
Silicon Dioxide (SiO2) with Mafic Silicates
metamorphic/igneous
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Banded Agate
Cryptocrystalline Quartz (SiO2)
mineral
Chert (often called Flint)
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Banded Agate (specifically Gobi Eyes or Eye Agate)
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
River Sandstone (Lithic Arenite)
Lithic Sandstone (SiO2 dominated with lithic fragments)
sedimentary
Rose Quartz
Quartz (SiO₂), specifically a variety of Quartz
Mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Spider Conch Shell
Lambis lambis (Calcium Carbonate, CaCO3)
sedimentary
Diabase (also known as Dolerite)
Diabase / Microgabbro
igneous
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Hematite (Iron Ore)
Iron(III) oxide (Fe2O3)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with impurities)
igneous
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous copper aluminium phosphate)
mineral
Quartzite Arrowhead (Archaeological Lithic)
Recrystallized Quartz (SiO2)
metamorphic
Sandstone
Arenite (general term for sandstone)
Sedimentary Rock
Slate
Slate
metamorphic
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Serpentinite
Serpentinite ((Mg,Fe,Ni,Al)3Si2O5(OH)4)
metamorphic
Peridotite (Olivine/Peridot)
Peridotite: (Mg,Fe)2SiO4 (Olivine-rich ultramafic rock)
igneous
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Greenstone
Protolith of basalt/gabbro (chlorite-epidote metamorphic facies)
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Moonstone
Orthoclase (KAlSi3O8) with Albite (NaAlSi3O8)
mineral
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
sedimentary
Quartzite
Quartzite (Primary mineral: Quartz, SiO2)
metamorphic
Iron Ore (Magnetite-Hematite)
Magnetite (Fe3O4) and Hematite (Fe2O3)
mineral
Chert Concretion / Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Mixed River Stones and Agates
Mixed Silicates and Ironstones (primarily SiO2 and Fe2O3)
sedimentary
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (likely Quartzose Sandstone with mineral staining)
Arenite (composed mainly of SiO2)
sedimentary
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Serpentine
Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Granitoid (Granite/Gneiss mix)
Granite or Granitic Gneiss (Silicon dioxide SiO2 with Al, K, Na silicates)
igneous/metamorphic
Fossiliferous Limestone
Fossiliferous Calcite (CaCO3)
sedimentary
Granite with Epidote
Granite, containing quartz, feldspar, and epidote
Igneous
Agate Nodule / Weathered Chert
SiO2 (Silicon Dioxide - Microcrystalline Quartz)
Sedimentary / Mineral