Peacock Ore (Treated Chalcopyrite)
Copper Iron Sulfide (CuFeS2) coated with oxides
mineral
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White Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Quartz (SiO2)
mineral
Copper-bearing Quartz Vein in Host Rock
Quartz with Malachite/Chrysocolla staining
igneous/metamorphic with mineral
Peacock Ore
Bornite (Cu5FeS4)
mineral
Black Obsidian
Volcanic glass
igneous
Wollastonite
Calcium Inosilicate, CaSiO3
mineral
Granite Pebble
Intrusive Igneous Rock (Quartz, Feldspar, Mica)
igneous
Peacock Ore
Bornite (Cu5FeS4) with surface tarnish
mineral
Mixed Rock Collection (Pebbles and Stones)
Various geological specimens
igneous, sedimentary, and metamorphic
Tumbled Agate
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Wavellite with Quartz
Al3(PO4)2(OH,F)3 & SiO2
mineral
Tumbled Agate
Silicon Dioxide (Quartz variety: Chalcedony)
gemstone
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Optical Calcite
CaCO3 (Calcium Carbonate)
mineral
Chert/Flint Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Ca5(PO4)3(F,Cl,OH)
mineral
Tumbled Red Jasper
Quartz (Microcrystalline variety of chalcedony, SiO2)
mineral
Sandstone and Conglomerate pebbles
Sedimentary clastic rock
sedimentary
Rose Quartz
Silicon Dioxide (Quartz), SiO2
mineral
Granite and Porphyry Pebbles
Intrusive Igneous Rock
igneous
Amethyst
Silicon Dioxide (Quartz variety), SiO2
mineral
Desert Rose
Gypsum rosette (CaSO4·2H2O) or Barite rosette (BaSO4)
mineral
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Tumbled Lapis Lazuli
Lapis Lazuli (Rock containing Lazurite, Calcite, and Pyrite)
mineral
Yooperlite (Fluorescent Sodalite-bearing Syenite)
Syenite rich in sodalite
igneous
Tumbled Carnelian
Silicon Dioxide (Variety of Chalcedony), SiO2
gemstone
Tumbled Amethyst
Quartz (Silicon Dioxide, SiO2)
gemstone
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite
metamorphic
Quartz (Chert/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Pink Granite / K-Feldspar
Alkali feldspar granite / Potassium feldspar (Microcline/Orthoclase)
igneous
Crinoid Stem Fossils (Indian Beads / St. Cuthbert's Beads)
Crinoid columnal ossicles (phylum Echinodermata)
fossil
Tiger Iron
Composite rock (Quartz, Tiger's Eye, Hematite, and Jasper)
metamorphic
Amethyst
Quartz (Silicon Dioxide, SiO2)
gemstone
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz crystals on matrix
Silicon dioxide (SiO2)
mineral
Quartz Geode/Vug in Host Rock
SiO2 (Silicon Dioxide) in various host rocks
mineral
Green Banded Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral