Milky Quartz (Quartz Vein)
Silicon Dioxide (SiO2)
mineral
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Weathered iron-rich rock, possibly limonite/goethite-bearing breccia
Hydrated iron oxides/hydroxides, mainly limonite (mixture) and goethite, FeO(OH)·nH₂O
mineral
Granite
Phaneritic felsic intrusive igneous rock
igneous
Granite
Intrusive Igneous Rock
igneous
Manganese Oxide Crust on Limestone
Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Extrusive Igneous Rock with Secondary Mineral Fillings
igneous
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Rhyolite with Lithophysae and Iron Oxide
Extrusive igneous rock / Felsic volcanic rock
igneous
Sandstone (River Rock)
Arenite (composed primarily of SiO2)
sedimentary
Veined Grey Metamorphic Pebble
Quartzo-feldspathic vein in Metabasalt / Serpentinite / Slate
metamorphic
Copper-bearing porphyritic rock (likely bornite/chalcopyrite ore)
Altered porphyritic volcanic rock with copper sulfides, chiefly bornite (Cu₅FeS₄) and/or chalcopyrite (CuFeS₂)
igneous
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Lapis Lazuli
Lapis lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)
metamorphic
Lapis Lazuli (Tumbled Specimen)
Lapis Lazuli (Aggregate rock containing Lazurite: (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)
metamorphic
Bauxite
Bauxite (Aluminum Ore)
sedimentary
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Quartz Druzy Geode
Silicon Dioxide (SiO2) - Crystalline Variety
mineral
Decorative polished pebbles
Likely mixed quartz-rich lithologies, including quartzite, jasper, and/or basalt
mineral
Quartz Geode
Silicon Dioxide (SiO2) in Geodic habit
mineral
Gneiss
Gneiss
metamorphic
Fossilized Dinosaur Skull (Tyrannosaurus rex)
Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica
sedimentary
Granite
Intrusive Igneous Rock (Felsic)
igneous
Granite
Intrusive igneous rock (Felsic)
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Basalt (Amygdaloidal)
Amygdaloidal Basalt
igneous
Sandstone (Graywacke)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Fossil bivalve or brachiopod in sedimentary rock
Unidentified fossil shell impression; likely a ribbed bivalve or brachiopod preserved in shale/siltstone
fossil
Dark gray fine-grained stone, likely basalt
Basalt; mainly plagioclase feldspar, pyroxene, and sometimes olivine
igneous
Schist (Oxidized)
Mica Schist with Iron Oxide staining
metamorphic
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Dalmation Jasper (or Dalmation Stone)
Dalmation Stone (composed of Perthite, Quartz, and Arfvedsonite)
igneous
Vesicular Basalt with Epidote
Vesicular Basalt (Mg, Fe)2SiO4 with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Sandstone (Banded)
Clastic Sedimentary Rock: Arenite
sedimentary
Granite
Intrusive Igneous Rock
igneous
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Granite Pebble
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock (Felsic)
igneous
Granite
Intrusive igneous rock
igneous