Coquina / Fossiliferous Limestone
Coquina (composed primarily of Calcium Carbonate / CaCO3)
sedimentary
Category
Anthropogenic (Man Made Material Mimicking Sedimentary Rock)
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Coquina
Coquina (Biogenic Limestone / CaCO3)
sedimentary
Chert (often called Flint or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Basalt
Basalt
igneous
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Sandstone (SiO2-rich clastic sedimentary rock)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (Jasper/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Limestone (Weathered)
Sedimentary Carbonate Rock (CaCO3)
sedimentary
Flaked stone projectile point
Likely worked chert or fine-grained silicified shale; exact lithology cannot be confirmed from the image
metamorphic
Quartz
Silicon dioxide (SiO₂)
Mineral
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Phaneritic plutonic rock (SiO2 typically >69%)
igneous
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2)
sedimentary
Geode (Unopened)
Quartz Geode (SiO2) / Chalcedony Concretion
mineral
Sandstone (Ferruginous)
Arenite (with Iron Oxide)
sedimentary
Tumbled chalcedony or quartz pebble
Microcrystalline quartz, SiO₂ (likely chalcedony); exact identification is uncertain from the image
mineral
Red Slag Glass (Cullet)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Antropogenic (Man-made material)
Gravel / Crushed Stone
Aggregate (mixed mineral rock fragments)
sedimentary
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Yellow chalcedony (likely lemon agate or yellow jasper)
Microcrystalline quartz, SiO₂; possibly iron-bearing jasper or chrysoprase-like chalcedony
mineral
Tumbled aqua glassy mineral specimen, likely chrysocolla or turquoise imitation
Uncertain from image; possible chrysocolla (hydrated copper aluminosilicate, variable composition) or dyed/man-made glass
mineral
Chert (Common Variety, Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Chert (Alpha-Quartz, SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood (Silicified Wood)
Silicified Paleoflora (mainly Quartz, SiO2)
metamorphic
Yellow chalcedony (likely polished/tumbled pieces)
Microcrystalline quartz, SiO₂; commonly called yellow jasper or silicified limestone depending on exact texture
mineral
Fossilized Bored Limestone
Limestone with Ichnofossils (Gastrochaenolites or Entobia)
sedimentary
Crinoid Fossil Stem Segment
Class Crinoidea (Echinodermata)
sedimentary
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Flint
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Sandstone (Garden Boulder)
Sandstone (SiO2 dominated)
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Green Glass Slag
Amorphous Silicon Dioxide (SiO2) with metal oxide impurities
mineraloid (man-made)
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Green glassy mineral specimen, likely rough emerald or green fluorite
Tentatively beryl (Be₃Al₂Si₆O₁₈), emerald variety; synthetic/man-made glass cannot be excluded from the photograph
mineral
Chert / Flint
Chert (varieties include Flint)
Sedimentary
Banded Calcite (often commercially sold as 'Mexican Onyx' or 'Honey Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Tumbled ruby-in-zoisite (likely)
Ruby-bearing zoisite; zoisite Ca₂Al₃(SiO₄)₃(OH), corundum ruby Al₂O₃
metamorphic