Limestone Riprap
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Category
None
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Quartzite
Quartzite (mostly SiO2)
metamorphic
Pink Tiger's Eye
Silicified Riebeckite Asbestos (SiO2)
metamorphic
Chert (Chert / Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Common Opal/Jasper variant)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Glacial Erratic (Graywacke/Sandstone)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Green Jasper)
Microcrystalline Quartz (SiO2) with iron silicate inclusions
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
gemstone
Jasper and Agate
Chalcedony (SiO2 with impurities)
sedimentary
Chrysoprase
Silicon dioxide (SiO2) with nickel impurities
mineral
Red Jasper
Silicon Dioxide (SiO2) with hematite inclusions
sedimentary
Amethyst
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Citrine or Yellow Quartz
Quartz (SiO2) with iron impurities
mineral
Red Jasper
Quartz (SiO2) with hematite inclusions
sedimentary
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartz (Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Nodular Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Apache Tear (Obsidian)
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Amethyst
Silicon Dioxide (SiO2) with iron impurities
gemstone
Faceted Clear Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Green Quartz (Prasiolite)
Crystalline Silicon Dioxide (SiO2) with iron impurities
mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
metamorphic
Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Red Sandstone Pebble
Arenite with iron oxide (Hematite)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Dyed Howlite (Purple)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Native Gold
Native Gold (Au)
mineral
Chert (Beach Pebble)
Silicon Dioxide (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral