Jasper
Silicon dioxide (Microcrystalline quartz, SiO2 with iron oxide 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.
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Vesicular Basalt (Lava Rock)
Vesicular Basalt
igneous
Dyed Blue Agate
Silicon Dioxide (SiO2) with artificial cobalt-based dye
mineral
Quartz (with probable host rock)
Silicon Dioxide (SiO2)
mineral
Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Granite Pebble with Quartz Vein
Granite (Plutonic Igneous Rock) with Quartz (SiO2)
igneous
Jasper (Brown Iron-Rich Variety)
Silicon Dioxide (SiO2) with Fe2O3 (Iron Oxide/Crystalline Quartz)
sedimentary
Basalt
Basalt
Igneous
Blue Lace Agate (Variety of Chalcedony)
Silicon Dioxide (SiO2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Rough Citrine Quartz
Citrine (Silicon Dioxide, SiO2 with iron impurities)
mineral
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Chert (Yellow/Tan Variety)
Chert (SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Vesicular Basalt with Magnetite/Hematite
Mafic Extrusive Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH))
mineral
River Stone (Sandstone or Siltstone)
Sedimentary Rock (Clastic)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Yellow Aventurine
Quartz (Silicon Dioxide) with Mica inclusions (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Agate Geode Slice
Silicon Dioxide (SiO2) with trace elements
sedimentary
Silicon Carbide (Carborundum)
Silicon Carbide (SiC)
mineral
Quartz with inclusions
SiO2
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Asphalt Chunk (with aggregate)
Bituminous concrete / Anthropogenic conglomerate
sedimentary (anthropogenic/man-made conglomerate)
Red Jasper (possibly)
Jasper (a variety of Chalcedony, SiO2)
Mineral
Chrysocolla
Chrysocolla; (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Chalcedony (specifically Agate or Common Opal variety)
Cryptocrystalline Silica (SiO2)
mineral
Epidote-bearing Rock
Epidote / Silicate mineral aggregate
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Blue Topaz (facetted in jewelry)
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Prehnite
Prehnite, Ca2Al(AlSi3O10)(OH)2
mineral
Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
Rock Fragment with Calcite/Quartz Vein
Polymictic Rock Fragment (SiO2 / CaCO3)
igneous
Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)
mineral
Celestite (Celestine)
Strontium Sulfate (SrSO4)
mineral