Limonite Stained Basalt
Hydrated Iron Oxide on Mafic Volcanic Rock (FeO(OH)·nH2O)
igneous
Category
Industrial Byproduct (Anthropogenic Material)
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Painted Sandstone Cobble
Clastic Sedimentary Rock (Sandstone base)
sedimentary
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
mineral
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2) with Hematite/Limonite
mineral
Smoky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Anthracite Coal
Anthracite (Carbon C)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Diamond (in a jewelry setting)
Carbon (C)
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Amethyst and Limestone
Amethyst (SiO2 - Silicon Dioxide) and Limestone (CaCO3 - Calcium Carbonate)
The purple specimen is a mineral (Amethyst); the white specimen is a sedimentary rock (Limestone or Marble).
Grey Chalcedony
Silicon Dioxide (SiO2)
mineral
White Topaz
Topaz - Al2SiO4(F,OH)2
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Note: Item is not a geological specimen
Homo sapiens (Dermal Appendage: Pilus)
Organic / Biological
Yellow Jasper
Chalcedony (SiO2) with iron oxide inclusions
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Calcite Vug in Limestone
Calcium Carbonate (CaCO3) with Silicon Dioxide (SiO2) inclusions
sedimentary
Granitic Pegmatite with Tourmaline
Granite (Feldspar/Quartz matrix) with Schorl (NaFe2+3Al6Si6O18(BO3)3(OH)3OH)
igneous
Kyanite in Quartz
Al2SiO5 in SiO2
metamorphic
Agate (Carnelian / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Wild Horse Magnesite
Magnesite with Hematite inclusions (MgCO3)
mineral
Almandine Garnet
Almandine (Fe3Al2Si3O12)
mineral
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
mineral
Quartz (Gravel Pebble)
Silicon Dioxide (SiO2)
mineral
Garnet Schist
Almandine Garnet in Mica Schist (Fe3Al2(SiO4)3)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Kyawthuite
Kyawthuite (Bi3+Sb5+O4)
mineral
Quartzite with Iron Mineral Banding
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) staining
metamorphic
Chert (Common Opal variant)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Black Granite (Basalt or Gabbro)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Rose Quartz
SiO2 (Silicon Dioxide)
mineral
Drupa or Druzy Quartz on Geode Fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Sandstone (with manganese staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (with potential Arkose/Lithic characteristics)
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Diamond
Native Carbon (C)
gemstone
Fossilized Shark Tooth (Anterior/Lateral)
Otodus megalodon or Carcharodon carcharias (fossilized)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Boulder Opal
Hydrated Silica (SiO2·nH2O)
mineraloid