Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Category
Anthropogenic (Man Made Product Subject To Geological Processes)
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Dyed Quartz (imitating Emerald/Green Quartz)
Silicon Dioxide (SiO2) with artificial pigment
mineral
Vein-bearing metamorphic rock, likely gneiss or schist
Quartz-feldspar–mica metamorphic rock; exact identification requires testing
metamorphic
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Iron-stained Quartzite
Recrystallized Quartz (SiO2) with Hematite/Limonite staining
metamorphic
Caliche (also known as hardpan, calcrete, kankar)
Primarily composed of calcium carbonate (CaCO₃), often mixed with other minerals like quartz, clay minerals, and iron oxides.
Mineral
Quartzite
Quartzite (Metamorphosed Quartz Arenite)
metamorphic
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Diamond in Kimberlite
Diamond in Kimberlite Matrix (Diamond: C, Kimberlite: complex Potassic Peridotite)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Sandstone
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Red Quartzite
Quartzite (SiO2)
metamorphic
Pink Quartzite Pebble
Quartzite (SiO2)
metamorphic
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone
Arenite
sedimentary
Specular Hematite with Pyrite
Iron Oxide (Fe2O3) with Iron Sulfide (FeS2)
mineral
Conglomeratic concrete or asphalt aggregate surface with dark bituminous chunks
Polymictic gravel aggregate; dark pieces likely bitumen/asphalt, not a natural rock
sedimentary
Sandstone (likely Fossiliferous)
Arenite / Fossiliferous Sandstone (SiO2 composition)
sedimentary
Crushed Stone / Gravel
Aggregatus saxum (variable mineral composition)
sedimentary
Quartzite
Quartzite (Metamorphosed Sandstone)
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Quartzite
Metamorphosed quartz sandstone
metamorphic
Limestone
Sedimentary Rock (Primarily CaCO3)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Goldstone (aventurine glass)
Synthetic copper-bearing soda-lime glass; commonly sold as red goldstone
gemstone
Pyrite
Iron Sulfide (FeS2)
mineral
Porcelain (Stoneware Ceramic)
Mullite / Silica-glass composite (Al6Si2O13)
metamorphic (man-made)
Marble
Metamorphic Limestone (CaCO3)
metamorphic
Quartz
Quartz (SiO2)
Mineral
Quartz Pebble (Geode Nodules / Stream-Rounded Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone.
SiO2 (Silicon Dioxide)
Mineral or Sedimentary (if chert)
Gold Ore in Quartz
Auriferous Quartz (Au + SiO2)
igneous
Peridotite
Ultramafic intrusive igneous rock
igneous
Fossilized Coral (Coquina/Limestone)
Cnidaria Anthozoa (Fossilized)
sedimentary
Chalk
Micrite (primarily Calcium Carbonate, CaCO3)
sedimentary