Granite / Arkosic Sandstone (Coarse Igneous or Sedimentary Aggregate)
Granite / Quartz-Feldspar Aggregate
igneous
Category
Igneous Or Sedimentary
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Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Basalt with Chert or Jasper Inclusion
Igneous basalt / sedimentary chert nodule
igneous
Greenstone (Greywacke or Nephrite Jade variant)
Metamorphosed mafic igneous or sedimentary rock (e.g., Actinolite-Chlorite Schist)
metamorphic
Botryoidal Chalcedony
Chalcedony (SiO2)
Mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Agate
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Carnelian / Agate
Silicon Dioxide (SiO2) - Chalcedony
mineral
Zoisite with Ruby
Anyolite (Calcium aluminum hydroxy silicate with Corundum) Ca2Al3(SiO4)3(OH)
metamorphic
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Tumbled Agate
Silicon Dioxide (Chalcedony / Quartz)
gemstone
Tumbled Agate
Silicon dioxide (SiO2)
sedimentary
Quartz (Chalcedony/Agate)
Silicon Dioxide (SiO2)
mineral
Chalcedony
Chalcedony (SiO2)
mineral
Agate
Silicon dioxide (chalcedony), SiO2
sedimentary
Quartz Geode (with Calcite influence)
Silicon Dioxide (SiO2) with possible Calcium Carbonate (CaCO3)
mineral
Epidote with Quartz Vein
Epidote-bearing metamorphic rock with quartz (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Gneiss and Igneous Rock Collection
Foliated Metamorphic Rock (Gneiss) / Igneous Rocks
metamorphic
Tumbled Agate
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Tumbled Agate
Silicon Dioxide (SiO2)
gemstone
Agate Bookend / Quartz Geode
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Agate
Silicon dioxide (Chalcedony), SiO2
gemstone
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Gneiss
Gneiss
metamorphic
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Chalcedony (Tumbled Agate/Jasper)
Silicon dioxide (SiO2)
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Granite or Granitic Gneiss
Granitoid / Gneiss
Igneous / Metamorphic
Foliated metamorphic rock, likely gneiss or mica schist
Quartz–feldspar–mica metamorphic rock; exact identification is uncertain from the photograph
metamorphic
Agate Nodule
Silicon Dioxide (Quartz/Chalcedony), SiO2
sedimentary
Agate
Silicon Dioxide (Quartz), SiO2
mineral
Tumbled Agate
Silicon Dioxide (Chalcedony variety), SiO2
mineral
Ruby Zoisite
Anyolite (Calcium aluminium silicate with Chromium/Corundum inclusions)
metamorphic
Gneiss
Gneiss
metamorphic
Sulemani Hakik (Eye Agate)
Chalcedony (SiO2)
gemstone
Agate Nodule / Weathered Chert
SiO2 (Silicon Dioxide - Microcrystalline Quartz)
Sedimentary / Mineral
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Tumbled Agate
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary