Tumbled blue-dyed stone, likely basalt or blue aventurine
Likely fine-grained basalt (plagioclase and pyroxene), possibly coated or dyed; exact identification requires testing
igneous
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
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Dalmatian jasper
Orbicular rhyolite, commonly marketed as Dalmatian jasper; quartz–feldspar volcanic rock with dark aegirine/arfvedsonite-like inclusions
igneous
Colorless faceted gemstone, likely cubic zirconia
Synthetic cubic zirconia (zirconium dioxide, ZrO₂); identity is visual and not definitive
gemstone
Granite
Granite
igneous
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Quartz with Mica/Chlorite inclusions
Silicon Dioxide (SiO2) with phyllosilicate inclusions
igneous/metamorphic mineral specimen
Satin Spar (Satin Spar Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Quartz with Iron Oxide Inclusions
Silicon Dioxide (SiO2) with Hematite/Limonite coatings
mineral
Peacock Ore (Bornite or Iridescent Chalcopyrite)
Bornite (Cu5FeS4) or Acid-treated Chalcopyrite (CuFeS2)
mineral
Bornite
Cu5FeS4 (Copper Iron Sulfide)
mineral
Yellow Citrine Quartz
Silicon Dioxide (SiO₂)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Peacock Ore (Chalcopyrite)
Chalcopyrite (CuFeS2)
mineral
Banded Calcite (often marketed as Mexican Onyx or Onyx Marble)
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Banded Calcite (often sold as Onyx)
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Satin Spar (often sold as Selenite)
Gypsum (CaSO4·2H2O)
mineral
Quartzite Pebble
Quartzite
metamorphic
Pumice and Scoria
Vesicular Volcanic Rock (Pumice: Silicic / Scoria: Mafic)
igneous
Quartzite Pebble
Metamorphic Quartz (SiO2)
metamorphic
Basalt River Pebble
Basalt
igneous
Kaolinite (China Clay)
Kaolinite (Al2Si2O5(OH)4)
sedimentary
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (Red/Brown)
Arenite (SiO2 dominated with iron oxides)
sedimentary
River Pebble (Quartzite/Siltstone)
Quartzite or Metasiltstone
metamorphic
Quartzite River Cobble
Quartzite (primarily SiO2)
metamorphic
Granite cobble
Granite (Felsic Plutonic Rock)
igneous
Red Scoria
Scoria (Vesicular Basaltic Andesite)
igneous
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartz Pebble (possibly Chalcedony or Chert)
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Vesicular Basalt (Lava Rock)
Vesicular Basalt
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pumice
Pumicite (Volcanic glass with vesicular texture)
igneous
River Stone (Quartzite)
Metamorphic Quartzite (primarily SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite with Quartz Vein
Metamorphosed Quartz-rich Arenite (SiO2)
metamorphic
Sand Grain (Quartz)
Silicon Dioxide (SiO2)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
River Stone (likely Siltstone or fine-grained Quartzite)
Sedimentary clastic rock containing SiO2 and iron oxides
sedimentary
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
River Rock (Basalt/Greywacke)
Aphanitic Basalt or Lithic Sandstone (Greywacke)
igneous
Quartzite River Stone
Quartzite (SiO2)
metamorphic