Basalt
Extrusive igneous rock
igneous
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Quartz Vein Rock
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Metamorphic Quartzite
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with impurities, microcrystalline quartz
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Petrified Wood
Silicified wood (primarily quartz, SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Granite Pebble
Phaneritic Igneous Rock
igneous
Granite
Granite (Plutonic Igneous Rock)
igneous
Echinoid Fossil in Flint or Chert Nodule
Echinoidea embedded in sedimentary silica (SiO2)
fossil
Granite
Felsic intrusive igneous rock
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Jasper / Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Jasper and Quartz
Silicon Dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Granite and Igneous Rock Collection
Intrusive igneous rock / Granitoid
igneous
Limestone
Sedimentary Rock (Primarily CaCO3)
sedimentary
Mixed Mineral Assortment (Pyrite, Kyanite, Agate, Jasper)
FeS2 (Pyrite), Al2SiO5 (Kyanite), SiO2 (Agate/Jasper)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Flint
Silicon Dioxide (SiO2)
sedimentary
Chert
Silicon dioxide (Microcrystalline Quartz, $SiO_2$)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Microcline Feldspar
KAlSi3O8
mineral
Pumice
Pumice
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Green Opal
Hydrated amorphous silica (SiO2·nH2O)
mineral
Limonite with Quartz
Hydrated Iron Oxide Hydroxide with Silicon Dioxide (FeO(OH)·nH2O + SiO2)
mineral
Amethyst
Quartz (Silicon Dioxide, SiO2)
gemstone
Fluorite and Mineral Collection
Calcium Fluoride (CaF2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Tiger's Eye
Silicon Dioxide (Quartz pseudomorph after crocidolite), SiO2
mineral
Yellow Jasper
Silicon dioxide, SiO2
mineral
Chevron Amethyst
Silicon Dioxide (Quartz variety), SiO2
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Raw Pink Salt (Himalayan Salt)
Halite (NaCl with trace minerals)
mineral
Fossil Shell
Invertebrate fossil (Mollusca)
fossil