Amber
Succinite (Fossilized Tree Resin)
Organic Mineraloid
Category
Not A Rock (Man Made Origin)
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Granite, possibly granodiorite
Coarse-grained felsic plutonic rock; chiefly quartz (SiO₂), potassium feldspar and plagioclase feldspar, with biotite and/or hornblende
igneous
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Asphalt (Bituminous Concrete)
Composite material (bitumen binder with mineral aggregate)
man-made rock (technosol)
Blue cabochon gemstone ring
Uncertain; likely blue sapphire (corundum, Al₂O₃), blue topaz, or synthetic glass/spinel
gemstone
Blue Sapphire
Corundum (Al2O3 with trace amounts of Fe and Ti)
gemstone
Alexandrite
Chrysoberyl (BeAl2O4 with Chromium impurities)
mineral
Ruby
Corundum (Al2O3 with Chromium impurities)
mineral
Chert (Jasper Variant likely)
Silicon Dioxide (SiO2)
Sedimentary Rock or Mineral (depending on origin and purity)
Basalt
Basalt
igneous
Desert Rose (Baryte or Gypsum Rose)
Baryte (BaSO4) or Gypsum (CaSO4·2H2O)
mineral
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Likely iron-rich rock or weathered metallic mineral fragment
Uncertain; possibly limonite/goethite or iron-bearing slag
mineral
Chert (Nodular Chert)
Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Kidney Stone (Urolith / Calcium Oxalate Stone)
Calcium Oxalate Monohydrate (Whewellite) / Calcium Oxalate Dihydrate (Weddellite)
mineral
Synthetic Faux Fur Fursuit
Polyacrylonitrile / Polyester (Synthetic Textile)
not a rock (synthetic material/costume)
Sandstone
Arenite (SiO2 primarily)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Geode (Unopened)
Quartz Geode (SiO2) / Chalcedony Concretion
mineral
Polished kambaba jasper
Orbicular stromatolitic jasper; microcrystalline quartz (SiO₂) with chlorite/amphibole-rich inclusions
sedimentary
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Tektite (Indochinite)
Tektite (SiO2 + Al2O3)
mineraloid
Jet
Lignite (Anthracite-grade compact coal)
sedimentary
Cockle Shell (Fossil or Recent)
Class Bivalvia, Family Cardiidae (e.g., Cerastoderma edule for common cockle)
Sedimentary (Biogenic, a type of fossil)
Sandstone
Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)
Sedimentary
Crinoid Fossil in Limestone
Crinoid columnal (Class Crinoidea) in biomicrite
fossil
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Sandstone
Sandstone (Quartz-rich Arenite / SiO2)
sedimentary
Amber
Fossilized tree resin
gemstone
Amber
Succiniferous fossil resin (C10H16O)
mineraloid
Peridot (Gem-quality Olivine)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert
Microcrystalline quartz (SiO2)
sedimentary
Tumbled orbicular granite
Granite, predominantly potassium feldspar, plagioclase, quartz, and biotite/hornblende
igneous
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Fluorite
Calcium Fluoride (CaF2)
mineral
Granodiorite
Granodiorite (Quartz + Plagioclase + Alkali Feldspar + Biotite/Hornblende)
igneous
Pearl
Pearl; primarily aragonite (CaCO₃) in nacre
gemstone
Yooperlite (Syenite clast containing fluorescent Sodalite)
Sodalite-bearing Syenite
igneous
Diorite (River Pebble)
Intermediate Phaneritic Igneous Rock
igneous
Granite (Pegmatitic)
Phaneritic Felsic Igneous Rock
igneous