Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Category
Mineral, Often A Rock Given Its Aggregate Nature
Browse mineral, often a rock given its aggregate nature specimens identified by the Rock Identifier community.
Learn about Mineral, Often A Rock Given Its Aggregate Nature in the encyclopedia
View all →
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Chipped Glass/Plastic Fragment
Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic
Man-made material (simulant/artifact)
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Red Breccia Jasper
Silicon Dioxide (SiO2) with hematite and various mineral inclusions
sedimentary
Shale
Argillaceous Sedimentary Rock
sedimentary
Sandstone (Quartz Sandstone)
Arenite (primarily SiO2)
sedimentary
Bituminous Coal
Organic Sedimentary Rock (Carbon-based)
sedimentary
Blue Howlite (Dyed)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Sandstone (Grooved/Weathered)
Arenite (composed primarily of Quartz and Lithic fragments)
sedimentary
Quartzite
Metamorphic Quartz Sandstone
metamorphic
Sandstone
Sandstone (various mineral compositions)
Sedimentary
Dyed Blue Agate
Silicon Dioxide (SiO2)
Mineral
Agate (specifically, multi-colored or pastel-dyed agate)
Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).
Mineral
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Mineral/Sedimentary Geode
Chrysocolla on Matrix
Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with Ferric Hydroxide impurities
mineral
Jasper
Jasper (Cryptocrystalline Quartz; SiO2)
sedimentary
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Biotite Schist
Biotite Schist
Metamorphic
Blue Lace Agate (Tumbled)
Silicon Dioxide (SiO2)
mineral
River Rock (likely Basalt or Greywacke)
Basalt or Lithic Sandstone
Igneous or Sedimentary (water-worn)
Granite
Granite (a plutonic igneous rock)
Igneous
Fuchsite
Fuchsite (a variety of Muscovite mica, K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Agate
SiO2
mineral
Quartz Vein in Host Rock (Pebble)
Quartz (SiO2) with sandstone or siltstone matrix
metamorphic/igneous transition
River Stone (Basalt Porphyry)
Porphyritic Basalt
igneous
Chert / River Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Red and Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (primarily SiO2)
metamorphic
Red Jasper (Polished)
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Mineral
Jasper (Chert)
Silicon Dioxide (SiO2)
sedimentary
Pyrite in Quartz Matrix
Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)
mineral
Pyrite-bearing Rock / Pyrite Ore
Iron Sulfide (FeS2) in host rock matrix
mineral
Granite
Granite (a common igneous rock)
igneous
Jasper with Hematite inclusions
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
sedimentary
Jade (Nephrite or Jadeite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)
Metamorphic Rock / Mineral
Jasper (specifically Yellow or Bumblebee-like Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary
Pyrite in Shale
Iron Sulfide (FeS2)
mineral
Fulgurite
Fulgurite (Lechatelierite)
metamorphic