Agate in Matrix
Silicon Dioxide (SiO2) within host rock
mineral
Category
Igneous Or Sedimentary
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Gneiss
Gneiss
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Yellow Chalcedony / Yellow Agate
Silicon Dioxide (SiO2)
mineral
Gneiss with Quartz Vein
Gneiss containing Quartz (SiO2) filler
metamorphic
Chalcedony (Agate/Carnelian)
Cryptocrystalline Quartz (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon dioxide (Chalcedony), SiO2
gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
River Stone (River Rock)
Smooth Clastic Sedimentary Rock
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Gneiss (River Cobble)
Gneiss
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Gneiss (Banded 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
Chalcedony (Quartz Var.)
Silicon Dioxide (SiO2)
mineral
Quartz Geode fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Gneiss
Foliated Metamorphic Rock
metamorphic
Gneiss with Quartz Veining
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
River Pebble (Granite/Sandstone Pebble)
Rounded Quartz/Feldspar Gravel Clast
igneous
Banded Agate
Silicon Dioxide (SiO2)
mineral
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Chalcedony (Grey/White Agate)
Silicon Dioxide (SiO₂)
mineral
Gneiss
High-grade regional metamorphic rock (Foliated)
metamorphic
Gneiss
Gneiss
metamorphic
Carnelian (Chalcedony)
SiO2 (Silicon Dioxide - Microcrystalline Quartz)
mineral
Chalcedony (Agate/Carnelian variant)
Cryptocrystalline Silica (SiO2)
mineral
Heliotrope (Bloodstone)
Cryptocrystalline Quartz (SiO2) with inclusions of Hematite (Fe2O3)
mineral
Yellow Agate
Silicon Dioxide (SiO2)
gemstone
Epidote with Quartz
Ca2(Al,Fe)3(SiO4)3(OH) (Epidote) / SiO2 (Quartz)
mineral
Yellow Chalcedony (likely Carnelian or Agate)
Silicon dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Biotite-rich gneiss (possibly mica schist)
Quartz–feldspar–biotite gneiss; mica-rich metamorphic rock
metamorphic
Gneiss
Gneiss
metamorphic
Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Banded Gneiss
Gneiss
metamorphic
Chalcedony (Agate/Quartz variety)
Cryptocrystalline Quartz (SiO2)
mineral