Conglomerate
Conglomeratic Sandstone
sedimentary
Category
Not A Natural Rock
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Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Blue goldstone beads
Man-made aventurine glass (silica glass with metallic copper inclusions), not natural lapis lazuli
mineral
Red Siltstone
Clastic Sedimentary Rock
sedimentary
Rounded gray-green pebble, likely fine-grained volcanic rock
Possibly basalt or andesite; exact identification is not possible from the image alone
igneous
Quartz with Iron Staining
Silicon Dioxide with Iron Oxides (SiO2 + Fe2O3)
mineral
Blue slag glass / industrial glass fragment
Artificial silicate glass, composition variable; likely copper- or cobalt-colored furnace slag
mineral
Conglomerate
Clastic Sedimentary Rock
sedimentary
Shale
Lutaceous sedimentary rock
sedimentary
Heart-shaped Limestone
Calcium Carbonate (CaCO3)
sedimentary
Rounded gray pebble, likely fine-grained volcanic rock
Indeterminate; possibly andesite or basalt
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Tektite
Natural impact glass
meteorite
Sandstone Pebble with Mineral Encrustation
Quartz Sandstone with Calcite/Halite Crust
sedimentary
Tektite
Impactite (Natural Silicate Glass)
meteorite
Porphyritic Basalt Pebble
Extrusive igneous rock with plagioclase phenocrysts
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone with Quartz Sphere
Arenite (SiO2-rich sedimentary rock) with Quartzite/Rose Quartz sphere
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Granite
Intrusive Igneous Rock
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Granite Pebble
Intrusive Igneous Rock
igneous
Sandstone Pebble
Arenite (Sandstone)
sedimentary
Unidentified small stone fragments
Indeterminate; the image does not show enough detail to identify a mineral or rock species
mineral
Snowflake obsidian beads
Obsidian, volcanic glass (predominantly SiO₂), with pale cristobalite/spherulitic inclusions
igneous
Pumice
Pumice (felsic volcanic rock)
igneous
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Emerald in Matrix
Beryl (Be3Al2(SiO3)6)
gemstone
Small tan pebble, likely sandstone
Quartz-rich sandstone (tentative identification)
sedimentary
Rounded quartz-rich pebble
Likely quartzite or quartz-rich sandstone; exact identification is uncertain from the image
sedimentary
Orbicular granite (likely rapakivi-type granite)
Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Emerald in Matrix
Beryllium Aluminum Silicate (Be3Al2(SiO3)6)
gemstone
Red Sandstone
Sedimentary Arenite
sedimentary
Tumbled Black Stone
Unknown (possibly basalt, obsidian, or black jasper)
igneous or sedimentary
Unidentified gray metallic object
Not determinable from the image; likely a metal screw or manufactured fastener rather than geological material
mineral
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite (or Engineered Quartz Stone)
SiO2 (Silicon Dioxide)
metamorphic
Limonite (Ironstone)
Limonite (FeO(OH)·nH2O)
mineral
Rounded green-gray pebble, likely altered basalt
Fine-grained mafic volcanic rock; exact identification requires examination
igneous