Chert (Common Opal/Jasper variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Not A Rock (Man Made Polymer)
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Pallasite Meteorite
Pallasite (Stony-Iron Meteorite)
meteorite
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Grass (Organic Matter/Soil)
Poaceae (family of monocotyledonous flowering plants)
Organic Materia (Not a rock or mineral)
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Gold (Elemental Metal)
Gold (Au)
Mineral
Crushed Stone / Gravel
Aggregatus saxum (variable mineral composition)
sedimentary
Red gemstone ring, likely garnet or synthetic ruby
Possibly almandine garnet (Fe₃Al₂(SiO₄)₃) or corundum/ruby (Al₂O₃); image alone cannot distinguish
gemstone
Chert
Microcrystalline quartz (SiO2)
sedimentary
Mother of Pearl (Nacre) / Shell Fragment
Biogenic Calcium Carbonate (Aragonite and Conchiolin)
fossil
Sand Tiger Shark Tooth (Fossil)
Carcharias taurus (fossilized dentin/enameloid)
fossil
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Crinoid Columnal Fossil in Chert
Crinoidea stemming section in Microcrystalline Quartz (SiO2)
fossil
Pearl
Pearl (Calcium Carbonate with organic conchiolin, CaCO3)
mineral
Chert (with Limestone matrix)
Silicon dioxide (SiO2)
sedimentary
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8) with Albite inclusions
mineral
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and/or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (variations include Flint/Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert / Jasper
Silicon Dioxide (SiO₂)
sedimentary
Diamond
Diamond (pure Carbon, C)
mineral
Silver (Jewelry form)
Native Silver (Ag)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Green Glass Cullet / Recycled Glass
Amorphous Silicon Dioxide (SiO2) with various metal oxides
Man-made Glass (Not a natural rock or mineral)
Lapis Lazuli
Lapis Lazuli (a rock type, not a single mineral, composed primarily of lazurite, calcite, and pyrite)
Mineral, part of a rock
Flint / Chert
Microcrystalline quartz (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint Arrowhead)
Silicon Dioxide (SiO2)
sedimentary
Black Chert River Stone
Cryptocrystalline Quartz (SiO2)
sedimentary
Malachite
Malachite (Cu2CO3(OH)2)
mineral
Chert (Black Chert or Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint Nodules)
Cryptocrystalline Quartz (SiO2)
sedimentary
Tektite (Indochinite)
Tektite (Amorphous Silica Glass)
igneous
Natural Pearl (appearing in a jewelry setting)
Calcium Carbonate (mostly Aragonite), CaCO3 with Conchiolin
mineral
Rough Diamond
Diamond (pure Carbon, C)
mineral
Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
Diamond
Native Carbon (C)
mineral
Chert (Nodule)
Chert (Silicon Dioxide, SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic