Clear Quartz
Silicon Dioxide (SiO2)
mineral
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Green Aventurine
Quartz with Fuchsite inclusions (SiO2)
mineral
Granite Boulder
Intrusive Igneous Rock
igneous
Granite Boulder
Felsic Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Sandstone or Weathered Conglomerate
Sedimentary Rock (Quartzose Sandstone / Lithic Arenite)
sedimentary
Cannonball Concretion
Calcite-cemented Sandstone Concretion
sedimentary
Quartz-veined Sedimentary Rock
Sedimentary rock with hydrothermal quartz veins
sedimentary
Citrine Quartz (Carved Point)
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz (Rose Quartz or Chert variant)
Silicon Dioxide (SiO2)
mineral
Pink Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (Metamorphic Quartz Sandstone)
metamorphic
Ferruginous Quartz
Silicon Dioxide with Iron Oxide Inclusions (SiO2)
mineral
Coal
Bituminous or sub-bituminous coal (carbonaceous rock)
sedimentary
Pink Granite
Granite
igneous
Ferruginous Quartz
Quartz (Silicon Dioxide, SiO2) with Iron Oxide Inclusions
mineral
Granite
Intrusive Igneous Rock
igneous
Petrified Wood
Silicified Wood (SiO2)
fossil
Basalt Pebble
Extrusive Igneous Rock
igneous
Hematoid Quartz
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
mineral
Unakite
Altered Granite (Epidotized Granite)
metamorphic
K-Feldspar / Granite Pegmatite
Potassium Feldspar (Microcline/Orthoclase) with Quartz
igneous
Pegmatite
Granite Pegmatite
igneous
Pegmatite (Graphic Granite / Granite Pegmatite)
Coarse-grained intrusive igneous rock (Felsic)
igneous
Quartzite
Metamorphic Quartz Arenite (SiO2)
metamorphic
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Bumblebee Jasper
Fibrous Calcite with Arsenic and Sulfur Inclusions
gemstone
Petrified Wood
Silicified wood (Quartz replacement of organic wood structure)
fossil
Basalt Pebble
Extrusive Igneous Rock / Basalt
igneous
Ruby (in a ring setting)
Corundum (Al2O3:Cr)
gemstone
Desert Rose (Baryte or Gypsum rosette)
Baryte (BaSO4) or Gypsum (CaSO4·2H2O)
mineral
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Gossan / Iron-Rich Weathered Rock
Hydrated Iron Oxides / Limonite / Goethite
mineral
Rugose Coral Fossil
Order Rugosa
fossil
Sandstone Pebble
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
mineral
Granite
Felsic intrusive igneous rock
igneous