Chert / Flint Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Category
Mineral Within Sedimentary Rock
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Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 with assorted lithic fragments)
sedimentary
Common Opal with Host Rock
Opal (Hydrated silica, SiO2·nH2O)
mineral
Druzy Quartz on Matrix (likely Limestone or Sandstone)
Silicon Dioxide (SiO2) with various trace impurities
Mineral on Sedimentary Rock
Almandine Garnet in Schist
Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist
metamorphic
Yellow Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Precious Opal in Matrix
Hydrated Silica (SiO2·nH2O)
mineral
Banded Gneiss Pebble
Banded Gneiss
metamorphic
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Dalmatian Stone
Peralkaline Feldsphathic Igneous Rock
igneous
Quartz Geode (Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Chert (White Chert/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Garnet in Schist
Almandine Garnet in Mica-Schist (Fe3Al2(SiO4)3)
metamorphic
Biotite Gneiss
Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)
metamorphic
Unopened Geode
Geode (containing various mineralization like Quartz SiO2)
sedimentary
Fossilized Insect in Nodular Matrix
Invertebrata / Insecta fossil in sedimentary concretion
fossil
Agate (specifically Chalcedony nodule)
Silicon Dioxide (SiO2)
mineral
Sandstone (specifically Picture Sandstone or Wonderstone)
Arenite (composed primarily of SiO2)
sedimentary
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Veined Limestone (or Quartz-Veined Slate/Shale)
Metamorphosed Sedimentary Rock with Calcite/Quartz Veins
metamorphic
Gneiss (with Garnet)
Gneiss (Feldspar-Quartz-Biotite-Garnet Metamorphic Rock)
metamorphic
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Quartz Geode
Quartz (Silicon Dioxide - SiO2) within a Chalcedony and Limonite shell
sedimentary
Chert Concretion (Flint)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Sandstone (Ferruginous)
Arenite (Fe2O3 staining)
sedimentary
Ironstone (likely siderite or goethite-rich siltstone)
Ferruginous Siltstone
sedimentary
Banded Sandstone (Liesegang Rings)
Sedimentary Arenite (SiO2 with FeO/Fe2O3 impurities)
sedimentary
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Mica Schist
Crystalline Schist (often containing Muscovite, Biotite, and Quartz)
metamorphic
Banded Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone Concretion
Clastic Sedimentary Concretion (SiO2 with Iron Oxide)
sedimentary
Brown Chert
Cryptocrystalline Silica (SiO2)
sedimentary
Green Gneiss
Metamorphic Gneiss
metamorphic
Yellow Jasper / Chalcedony
Silicon Dioxide (SiO2) with iron inclusions
mineral
Triceratops Fossil
Triceratops horridus
fossil
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary