Porphyritic Basalt or Porphyry
Porphyritic Igneous Rock
igneous
Category
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Basalt
Extrusive Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Basalt (Concrete Aggregate)
Basalt (Mafic volcanic rock)
igneous
Agate
SiO2
Mineral
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Weathered sandstone cobble
Quartz-rich sandstone, primarily SiO₂ with clay/iron-oxide cement
sedimentary
Quartzite with Chlorite/Epidote
Metamorphosed Quartzite (SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Tanzanite
Zoisite (Ca2Al3(SiO4)(Si2O7)O(OH))
gemstone
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Agate
SiO2 (Chalcedony/Quartz)
sedimentary
Agate
Chalcedony (SiO2)
mineral
Fossilized Gastropod Shell
Gastropoda (Class) replacement / internal cast (steinkern)
fossil
Chert / Flint Nodule
Microcrystalline quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled Agate
Silicon dioxide (SiO2)
sedimentary
Blue Agate (Dyed Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz Druzy (on Matrix)
Silicon Dioxide (SiO2)
mineral
Chert Nodules in Limestone
Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Chert Nodules or Concretion
Cryptocrystalline Quartz (SiO2)
sedimentary
Wishing Stone (Basalt/Siltstone with Quartz/Calcite vein)
Carbonaceous Siltstone with Quartz (SiO2) or Calcite (CaCO3) vein
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Conglomerate
Polymictic Conglomerate
sedimentary
Druzy Quartz on Sandstone
Silicon Dioxide (SiO2) with Quartz crystals
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (White/Milky)
Silicon Dioxide (SiO2)
mineral
Sandstone
Sandstone (Siliciclastic Sedimentary Rock)
sedimentary
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Porphyry (Porphyritic Basalt / Andesite)
Porphyritic Igneous Rock
igneous
River Rock
Silica-rich water-worn rock / Quartzite
sedimentary
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Sandstone
Clastic sedimentary rock
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic