Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Category
Igneous Or Sedimentary (Anthropogenic Modification)
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Quartz pebble (Agate / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Agate Nodule / Weathered Chert
SiO2 (Silicon Dioxide - Microcrystalline Quartz)
Sedimentary / Mineral
Gneiss
Gneiss
metamorphic
Quartz Druzy (on Geode Fragments)
Silicon Dioxide (SiO2)
mineral
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss (specifically Banded Gneiss)
Gneiss
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Banded Gneiss
Gneiss (high-grade metamorphic silicate rock)
metamorphic
Garnet-bearing gneiss
Quartz–feldspar–mica gneiss with iron-rich garnet (commonly almandine)
metamorphic
Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
sedimentary
Fossil shell fragment
Indeterminate molluscan bioclast, likely aragonite or calcite
fossil
Banded Gneiss
Gneiss
metamorphic
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Gneiss
Gneiss
metamorphic
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Carnelian Agate
Chalcedony (SiO2 with Iron Oxides)
sedimentary
Jasper Agate (Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Gneiss
Gneiss
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Gneiss with Quartz Veining
Gneiss (High-grade Metamorphic Rock)
metamorphic
Quartz Geode fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Gneiss
Foliated Metamorphic Rock
metamorphic
Ceramic or Polished Stone Heart (Anthropogenic Material)
Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)
Synthetic/Anthropogenic Mineraloid
Banded gneiss (likely amphibolite-bearing gneiss)
Gneiss; quartz–feldspar–mica/amphibole aggregate
metamorphic
Banded Gneiss
Gneiss (Metamorphic rock predominantly containing quartz, feldspar, and mica)
metamorphic
Gneiss
Gneiss
metamorphic