Jasper
Microcrystalline Quartz (SiO2)
sedimentary
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Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite
Felsic intrusive igneous rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Amazonite
Microcline feldspar (KAlSi3O8)
mineral
Amazonite
Microcline feldspar (KAlSi3O8)
mineral
Green Aventurine
Quartz with Fuchsite inclusions (SiO2)
mineral
Gold
Native Gold (Au)
mineral
Gold
Gold (Au)
mineral
River Pebble
Quartzite / Lithic Sandstone
sedimentary
Granite
Intrusive Igneous Rock
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Ferrochrome Slag
Calcium-Aluminium-Magnesium Silicate Slag
industrial byproduct
Slag
Metallurgical Slag
igneous
Red Agate
Chalcedony (SiO2)
gemstone
Laterite
Laterite (Iron- and aluminum-rich rock)
sedimentary
Coal
Combustible sedimentary rock
sedimentary
Scoria
Vesicular Mafic Igneous Rock
igneous
Gravel and Pebbles
Unconsolidated rock fragments / detrital sediment
sedimentary
Pumice
Pumice (Vesicular Felsic Igneous Rock)
igneous
Granite with Pyrite or Mica
Phaneritic intrusive igneous rock
igneous
Diabase (Dolerite)
Mafic intrusive igneous rock
igneous
Pumice
Pumice (Glassy Volcanic Rock)
igneous
Quartz (Yellow/Orange variety)
Silicon Dioxide (SiO2)
mineral
Flint
SiO2 (Cryptocrystalline Quartz)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Quartz pebble
Silicon dioxide (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Flint
Silicon dioxide (SiO2) - cryptocrystalline quartz
sedimentary
Sapphire
Corundum (Al2O3)
gemstone
Black Sapphire
Corundum (Al2O3)
gemstone
Obsidian with Cristobalite
Volcanic Glass (Amorphous Silicon Dioxide) with Cristobalite inclusions
igneous
Granite
Intrusive Igneous Rock
igneous
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Diorite
Intermediate intrusive igneous rock
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Lepidolite
K(Li,Al)3(Si,Al)4O10(F,OH)2
mineral
Basalt
Extrusive Igneous Rock (Mafic)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic