Tumbled green aventurine (probable)
Quartz, SiO₂, with green fuchsite mica inclusions
mineral
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
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Chert (Brecciated Chert)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Tumbled brown stone, likely jasper or iron-stained quartz
Microcrystalline quartz (SiO₂), possibly chalcedony/jasper with iron-oxide inclusions
mineral
Basalt (Vesicular)
Vesicular Basalt
igneous
Banded malachite cabochon
Malachite, Cu₂CO₃(OH)₂; the dark bands may be manganese-oxide or other sulfide-rich matrix, and could also indicate a composite or treated specimen
mineral
Copper-bearing Quartz (with Malachite and Iron Oxides)
Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)
Mineral Specimen
Limestone with Calcite Crust
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Weathered quartz-rich rock, possibly granite or quartzite
Indeterminate; likely quartz–feldspar aggregate, possibly granitic gneiss
igneous
Sandstone (Quartz-rich)
Arenite (SiO2)
sedimentary
Sandstone (with Iron Staining)
Arenite (SiO2 with Fe2O3/FeOOH impurities)
sedimentary
Drupa or Druzy Quartz on Geode Fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Dragon Vein Agate
Silicon dioxide / Chalcedony (with heat/dye treatment) SiO2
gemstone
Banded Jasper
Silicate Mineral (Microcrystalline Quartz / SiO2)
sedimentary
Milky Quartz Pebble
Quartz (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Sandstone
Arenite
sedimentary
Amethyst cluster
Amethyst, purple quartz (SiO₂)
mineral
River Pebble (Basalt or fine-grained Quartzite)
Fine-grained Mafic Rock (Volcanic Basalt)
igneous
Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Diamond
Carbon (C)
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Banded Sandstone / Quartzite Pebble
Sedimentary quartz arenite with liesegang banding
sedimentary
Tiger Shark Fossil Tooth
Galeocerdo cuvier (fossilized)
sedimentary
Septarian Nodule
Septaria (composed of Calcite, Aragonite, and Limestone)
sedimentary
Yellow Ocher (Iron-rich Silt/Clay)
Goethite-rich Limonite (FeO(OH)qnH2O)
sedimentary
Dark gray basalt or andesite cobble
Fine-grained mafic to intermediate volcanic rock; commonly plagioclase feldspar, pyroxene, and possibly olivine
igneous
Quartz Vein on Matrix
Silicon Dioxide (SiO2)
mineral
Diamond
C (Carbon)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 + Fe4+)
mineral
Carved lavender chalcedony (likely agate) animal figurine
Microcrystalline quartz, SiO₂; probable chalcedony or pale lavender agate
gemstone
Diamond in Kimberlite
Diamond in Kimberlite Matrix (Diamond: C, Kimberlite: complex Potassic Peridotite)
igneous
Weathered, porous limestone (probable fossiliferous limestone)
Calcite-rich limestone; predominantly CaCO₃
sedimentary
Quartz Crystal (specifically a Double-Terminated variety)
Silicon Dioxide (SiO2) - Low Quartz
mineral
Basalt
Basalt
Igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Smoky Quartz
Smoky Quartz (SiO2)
mineral
River Pebble (Greywacke / Basalt Pebble)
Indeterminate Rounded Pebble (composed of quartz, feldspar, or mafic minerals)
sedimentary
Granite
Phaneritic Plutonic Felsic Rock
igneous
Sandstone
Clastic Sedimentary Rock (primarily SiO2)
sedimentary