Quartzite (Engineered Stone)
Silicon Dioxide (SiO2) based synthetic composite
metamorphic
Category
Industrial By Product
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Asphalt (Aggregate)
Bituminous macadam / Concrete Aggregate
sedimentary
Green Slag Glass
Amorphous Silicon Dioxide (with metallic impurities)
Igneous (Anthropogenic)
Pumice
Pumice (a vesicular volcanic glass)
igneous
Turquenite (Dyed Howlite)
Dyed Ca2B5SiO9(OH)5 (Calcium Borosilicate Hydroxide)
mineral
Slag Glass (Cullet)
Amorphous Silica (man-made), primarily SiO2 with trace metal oxides
Mineraloid / Synthetic Glass
Quartzite
Quartzite (primarily SiO2)
metamorphic
Slag Glass
SiO2 (Silicon Dioxide) with impurities
man-made glass
Polished tiger’s-eye
Tiger’s-eye quartz (fibrous chalcedony/quartz, SiO₂)
metamorphic
Siltstone
Siltstone (primarily composed of microcrystalline Quartz and Feldspar)
sedimentary
Red Claystone / Mudstone
Argillaceous sedimentary rock
sedimentary
Pumice
Pumicite / Vesicular Rhyolite
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Pumice
Pumice (Vesicular Felsic Glass)
igneous
Pumice
Pumiceous volcanic glass
igneous
Pumice
Pumicite
igneous
Weathered, iron-stained quartz-rich pebble (uncertain identification)
Microcrystalline quartz, SiO₂, with iron-oxide/hydroxide staining and dark matrix inclusions
mineral
Iron-rich weathered pebble (likely limonite/goethite-bearing rock)
Limonite mixture, commonly dominated by goethite (FeO(OH)) and hematite (Fe₂O₃)
mineral
Pumice
Pumice (Highly vesicular felsic volcanic rock)
igneous
Pumice
Pumicite / Vesicular Rhyolite
igneous
Epidote
Epidote; Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
mineral
Clear quartz chips
Quartz (silicon dioxide, SiO₂)
mineral
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock - Arenite
sedimentary
Blue calcite (likely)
Calcite, calcium carbonate (CaCO₃)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Opalite
Man-made opalized glass
mineral
Tumbled tiger’s eye
Tiger’s eye (chatoyant quartz), SiO₂, typically pseudomorphic quartz after crocidolite
mineral
Tumbled chalcedony or quartz
Microcrystalline silica, SiO₂ (likely chalcedony; possibly milky quartz)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Slag
Anthropogenic Vitrophyre (Iron or Smelting Slag)
Mineral-like byproduct
Bentonite Clay
Montmorillonite (Al2H2O12Si4)
sedimentary
Uncertain polymict breccia or altered volcanic rock
Likely hydrothermally altered volcanic breccia; exact mineral identification requires testing
igneous
Iron-stained weathered pebble
Likely ferruginous sandstone or iron-rich chert; exact identification requires testing
sedimentary
Pumice
Pumice, vesicular volcanic glass (typically silica-rich rhyolitic composition)
igneous
Weathered quartz-rich rock fragment
Likely quartz-bearing feldspathic rock; exact identification requires testing
mineral
Epidote
Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
Mineral
Quartzite
Quartzite (SiO2)
metamorphic
Dead Sea Salt Crust
Halite (NaCl)
sedimentary
Small weathered rock fragment
Indeterminate; possibly limestone or altered volcanic rock
sedimentary
Wollastonite
Calcium Inosilicate Mineral, CaSiO3
mineral
Kyanite in Quartz
Kyanite (Al2SiO5) with Quartz (SiO2)
metamorphic
Weathered iron-rich geode or cavity fragment
Limonite/goethite-rich material, likely coating a weathered basaltic or volcanic host rock
mineral