Quartz (Milky or Cloudy)
Silicon Dioxide (SiO2)
mineral
Category
Mineral Health
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Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Obsidian
Extrusive igneous volcanic glass (rich in SiO2)
igneous
Quartz (Milky to Clear)
Silicon Dioxide (SiO2)
mineral
Obsidian
Extrusive igneous volcanic glass
igneous
Quartz (possibly Citrine or Smoky Quartz variety)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
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
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Agate
Silicon dioxide (SiO2)
mineral
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Fossil Shark Teeth (likely Sand Tiger Shark)
Carcharias taurus (fossilized dentition)
fossil
Granite
Granite (Felsic Intrusive Igneous Rock)
igneous
Amazonite
Microcline (KAlSi3O8) with Pb impurities
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Amygdaloidal Rhyolite
Amygdaloidal felsic extrusive rock
igneous
Granodiorite (River Cobble)
Granodiorite (contains Quartz, Plagioclase Feldspar, Biotite Mica)
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Black Sapphire
Corundum (Al2O3 with iron and titanium impurities)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Kimberlite with Diamond
Kimberlite (Diamond formula: C)
igneous
Granite Pebble
Phaneritic intrusive igneous rock (Quartz, Feldspar, Mica)
igneous
Diorite (Polished River Pebble)
Diorite (Intermediate intrusive igneous rock)
igneous
Gneiss
Gneiss (Metamorphic rock composed primarily of quartz, feldspar, and mica)
metamorphic
Mica Schist with Quartz
Mica-Quartz Schist (Muscovite subclass)
metamorphic
Diorite
Diorite (plutonic igneous rock)
igneous
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Chrysocolla in Matrix
Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Chrysocolla on Matrix
Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Vesicular Basalt
Vesicular Basalt (rich in silicate minerals mostly Plagioclase and Pyroxene)
igneous
Serpentine
Antigorite/Lizardite (Mg, Fe)3Si2O5(OH)4
metamorphic
Diorite
Intermediate plutonic igneous rock
igneous
Cinnabar
Mercury(II) sulfide (HgS)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral