Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
Category
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Browse this image does not display a rock, mineral, or geological specimen. it shows a human hand wearing a ring. specimens identified by the Rock Identifier community.
Polished Basalt
Basalt (Mafic volcanic rock)
Igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Granitic Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Sandstone (Quartzite-rich River Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Porphyritic Basalt (with Augite Crystals)
Porphyritic Mafic Volcanic Rock (Fe-Mg Silicates)
igneous
Mookaite Jasper
Silicified Radiolarite (Silicon Dioxide: SiO2)
sedimentary
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Quartz (likely Milky Quartz)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral
Vesicular Basalt with Xenocrysts
Mafic Igneous Plutonic/Extrusive Complex
igneous
Bivalve Shell (Fossil or Contemporary)
Class Bivalvie (various genera and species of clams, cockles, etc.)
Sedimentary (Biogenic sediment or biological remain)
Conglomerate
Conglomerate (Sedimentary Clastic Rock)
sedimentary
Limestone with Calcite
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Granite
Phaneritic Acidic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Petrified Wood (Agatized/Silicified Wood)
Silicified Wood (SiO2 - Silicon Dioxide)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Gneiss (Schistose)
Gneiss
metamorphic
Petrified Wood (Silicified Wood)
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
mineral
Spinifex Textured Komatiite
Komatiite (Mg-rich ultramafic volcanic rock)
igneous
Sandstone Concretion
Sedimentary concretion
Sedimentary
Quartz with inclusions (likely Chlorite or Hornblende) and country rock
SiO2 (Quartz) with associated ferromagnesian minerals
Mineral/Igneous/Metamorphic association
Quartz Vein in Schist
Quartz (SiO2) in Mica Schist
metamorphic
Banded Sandstone
Arenite with Liesegang banding (primarily SiO2 with FeO(OH) impurities)
sedimentary
Pink Granite
Phaneritic Plutonic Felsic Igneous Rock (Granite)
igneous
Sandstone with Liesegang Rings
Arenite with Iron Oxide Concretions
sedimentary
Labradorite (tumbled)
Labradorite (a plagioclase feldspar mineral between anorthite and albite; chemical formula: (Ca,Na)(Si,Al)4O8)
Mineral
Granite (Pink/Red variety)
Phaneritic Felsic Intrusive Igneous Rock (composed primarily of Quartz, K-Feldspar, and Plagioclase)
igneous
Basalt
Basalt (principally Plagioclase Feldspar and Pyroxene)
igneous
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Amethyst
SiO2 (Silicon Dioxide) - a variety of Quartz
Mineral
Galena
Lead Sulfide (PbS)
mineral
Granite (Leucogranite)
Felsic Plutonic Rock (Granite)
igneous
Quartz (variety of colors)
SiO2 (Silicon Dioxide)
Mineral
Gabbro
Gabbro (Mafic Plutonic Rock)
igneous
Basalt with Weathered Surface
Basalt
Igneous
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based with various mineral cements)
sedimentary
Jasper, possibly Brecciated Jasper or Ocean Jasper due to patterns and color
Silicon Dioxide (SiO2), a variety of Chalcedony
Sedimentary Rock
Anthracite Coal
Anthracite (a variety of coal, predominantly carbon)
Sedimentary Rock (Metamorphosed)
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary