Basalt with Quartz Vein and Weathering Crust
Amygdaloidal or Porphyritic Basalt
igneous
Category
Mineral (Evaporite)
Browse mineral (evaporite) specimens identified by the Rock Identifier community.
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Yellow Sapphire (Raw)
Corundum (Al2O3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Sandstone (Iron-stained)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Fluorite with Rhodochrosite
Fluorite (CaF2) and Rhodochrosite (MnCO3)
Mineral
Jasper with Quartz Vein
Silicon Dioxide (SiO2) with impurities
sedimentary
Red Sandstone
Arenite (primarily Quartz with Iron Oxide coating)
sedimentary
Blue Aragonite
Aragonite (Calcium Carbonate, CaCO3)
mineral
Granite
Granite (a common name for a felsic intrusive igneous rock)
Igneous Rock
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Amber
Succinate (Fossilized Resin)
mineral
Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Obsidian
Volcanic glass (SiO2 + impurities)
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurity)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Ruby and Diamond Heart Pendant
Corundum (Al2O3) and Diamond (C)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Obsidian
Extrusive igneous volcanic glass (rich in SiO2)
igneous
Quartz (Milky/Crystalline variety)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Cloudy)
Silicon Dioxide (SiO2)
mineral
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (possibly Citrine or Smoky Quartz variety)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky to Clear)
Silicon Dioxide (SiO2)
mineral
Obsidian
Extrusive igneous volcanic glass
igneous
Larimar
NaCa2Si3O8(OH)
gemstone
Lepidolite in Quartz Matrix
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Geode or Concretion
Silica-filled nodule (likely SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Malachite
Copper carbonate hydroxide Cu2CO3(OH)2
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Agate
Silicon dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Bull Quartz with Mica and Host Rock
Massive Quartz (SiO2) with Muscovite/Chlorite inclusions
igneous
Quartzite with inclusions
Metamorphic Rock (Mainly SiO2)
metamorphic
Marble
Recrystallized Calcite / Metamorphosed Limestone (CaCO3)
metamorphic