Red Jasper Concretion
Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Organic Materia (Not A Rock Or Mineral)
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Petrified Wood
Silicified Wood (SiO2)
metamorphic
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Quartz Geode
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Milky Quartz with Chlorite Schist Inclusions
Quartz (SiO2) with Chlorite Group silicates (typically (Mg,Fe)3(Si,Al)4O10(OH)2)
metamorphic
Sandstone and Conglomerate pebbles
Sedimentary clastic rock
sedimentary
Coprolite
Fossilized Feces
sedimentary
Bituminous Coal
Organic Sedimentary Rock (composed mostly of carbon with sulfur and hydrogen)
sedimentary
Shale (or Mudstone)
Siltstone/Argillite (composed mainly of clay and silt-sized particles)
sedimentary
Granite
Intrusive Igneous Rock (composed primarily of quartz, alkali feldspar, and plagioclase)
igneous
Copper-bearing Quartz Vein in Host Rock
Quartz with Malachite/Chrysocolla staining
igneous/metamorphic with mineral
Megalodon Shark Tooth
Otodus megalodon
fossil
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Amber
Fossilized Tree Resin
gemstone
Moss Agate
Silicon Dioxide (SiO2) with mineral inclusions of hornblende or chlorite
Mineral (variety of Chalcedony)
Amber
Succinite
mineraloid
Amber
Succinite (C10H16O)
mineraloid
Pearl
Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)
mineral
Dyed Agate (Tumbled)
Silicon Dioxide (Chalcedony variety, artificially dyed)
gemstone
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Chert (White Chert / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Calligraphy Stone
Fossiliferous Limestone (containing Hematite and Shells)
sedimentary
Chert (often called Flint)
Microcrystalline to cryptocrystalline quartz (SiO2)
sedimentary
Moss Agate
Silicon dioxide (SiO2) with mineral inclusions
Mineral
Sand Tiger Shark Tooth
Carcharias taurus (fossilized)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert (specifically Yellow/Honey Jasper variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Vesicular Basalt (Lava Rock)
Vesicular Basalt
igneous
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg3Si2O5(OH)4)
metamorphic
River Pebble (Siltstone / Fine-grained Sandstone)
Sedimentary Pebble (Siliclastic)
sedimentary
Sandstone
Arenite (SiO2 dominant)
sedimentary
Green Sandstone
Glauconitic Sandstone
sedimentary
Fossilized Bone (Petrified Bone)
Permineralized Vertebrate Remains
sedimentary
Chert (Jasper/Chaldcedony)
Silicon Dioxide (SiO2)
sedimentary
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Granite Pebble with Quartz Vein
Granite (Plutonic Igneous Rock) with Quartz (SiO2)
igneous
Fossilized Shark Tooth
Lamniformes (order) fossil
fossil
Petrified Bone Pebble
Silicified Fossilized Bone
fossil
Fossilized Crab Carapace (Concretion)
Decapoda (fossil), typically preserved in calcite or siderite concretion
sedimentary