Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Category
Igneous Or Sedimentary (Anthropogenic Modification)
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Gneiss
Gneiss
metamorphic
Gneiss (specifically Epidote-Quartz Gneiss)
Gneiss containing Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)) and Quartz (SiO2)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Chalcedony (Agate/Carnelian variety)
Cryptocrystalline Quartz (SiO2)
mineral
Ruby in Zoisite
Zoisite with Corundum (Ca2Al3(SiO4)(Si2O7)O(OH) + Al2O3)
metamorphic
Foliated Metamorphic Rock (likely Gneiss or Schist)
Gneissic Metamorphic Rock
metamorphic
Gneiss
High-grade regional metamorphic rock
metamorphic
Gneiss with Quartz Veining
Gneiss (High-grade Metamorphic Rock)
metamorphic
Gneiss Pebble
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Gneiss
Gneiss
metamorphic
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Metamorphic Gneiss
metamorphic
Ferrochrome Slag
Anthropogenic slag (Fe-Cr alloy waste)
industrial byproduct
Cobalt Blue Slag Glass
Amorphous Silicon Dioxide (anthropogenic) with Cobalt additives
mineraloid
Kaolinite (Kaolin)
Kaolinite (Al2Si2O5(OH)4)
mineral
River Stone (River Rock)
Smooth Clastic Sedimentary Rock
sedimentary
Banded Agate
Cryptocrystalline Quartz (SiO2)
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Botryoidal Chalcedony
Silicon Dioxide (SiO2)
mineral
Fluorite
Fluoride (Calcium Fluoride - CaF2)
mineral
Sulemani Hakik (Eye Agate)
Chalcedony (SiO2)
gemstone
River Pebble (Granite/Sandstone Pebble)
Rounded Quartz/Feldspar Gravel Clast
igneous
Quartzite Arrowhead (Archaeological Lithic)
Recrystallized Quartz (SiO2)
metamorphic
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
River Pebble (Gneiss or Granite)
Metamorphic Rock (likely Gneiss or Granitic composition)
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss (River Cobble)
Gneiss
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Granitic Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss (Green Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Carnelian
Silicon dioxide / Chalcedony (SiO2)
mineral
Gneiss
Foliated Metamorphic Gneiss
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Chalcedony (Tumbled Agate/Jasper)
Silicon dioxide (SiO2)
sedimentary