Brown Agate
Silicon Dioxide (SiO2)
mineral
Category
Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites)
Browse industrial byproduct (often confused with igneous rocks or meteorites) specimens identified by the Rock Identifier community.
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Native Copper with Malachite/Oxide Coating
Native Copper (Cu)
mineral
Green Apophyllite and Stilbite on Quartz Cluster
Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)
Mineral
River Stone (likely Basalt or Greywacke)
Basalt with mineral veining
igneous
Pyrite
Pyrite (FeS2)
Mineral
Gravel (likely Basalt or Greywacke)
Basalt (Mafic volcanic rock)
igneous
Amazonite
Microcline (KAlSi3O8)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite Pebble
SiO2 (Silicon Dioxide)
metamorphic
Native Copper in Basalt
Cu-element in Mafic Volcanic Rock (Basalt)
igneous
Black Sapphire
Corundum (Al2O3)
gemstone
Aquamarine
Beryl (Be3Al2(SiO3)6)
gemstone
Peacock Ore
Bornite (Cu5FeS4)
mineral
Tiny amber-colored crystal fragment
Indeterminate; possibly quartz, feldspar, mica, or a sulfide mineral
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Chalcedony (Common Opal variant)
Silicon dioxide (SiO2) with varying levels of hydration
mineral
Basalt
Extrusive Igneous Basalt
igneous
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Pumice
Pumiceous volcanic glass
igneous
Quartz on Chlorite Schist
Chlorite Schist (Mg,Fe)3(Si,Al)4O10(OH)2 with Quartz (SiO2)
metamorphic
Quartz Pebble
Crystalline Silica (SiO2)
sedimentary
Pyrite in Quartz
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
mineral
Blue Sapphire (in a faceted jewelry setting)
Corundum (Al2O3) with trace Iron and Titanium
mineral
Corundum
Corundum (Al2O3)
Mineral
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (Smoky/Brown variety)
Silicon dioxide (SiO2)
mineral
Agate
SiO2 (Chalcedony/Quartz)
sedimentary
Banded Serpentinite with Calcite Veins
Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Orange Sapphire
Corundum (Al2O3)
gemstone
Granite
Granite
igneous
Pegmatite
Igneous Pegmatite
igneous
Peridotite (Dunite)
Olivine-rich Peridotite ((Mg,Fe)2SiO4)
igneous
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Vesicular Basalt
Basalt (Mafic volcanic rock)
igneous
Yellow or Honey Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Agate Geode
Chalcedony (SiO2 - Silicon Dioxide)
sedimentary (secondary mineral formation)