Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Category
Igneous And Sedimentary
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Banded Agate
Cryptocrystalline Quartz (SiO2)
sedimentary
Banded Agate (Onyx variant)
Silicon dioxide (SiO2)
sedimentary
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Banded Gneiss
Banded Gneiss (High-grade Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Granite Gneiss
Granitic Gneiss
Metamorphic
Dyed Quartz Geode
Dyed crystalline quartz (Silicon Dioxide, SiO2)
mineral
Quartz-veined Gneiss
Gneiss with Quartz (SiO2) intrusions
metamorphic
Quartz Geode
Silicon dioxide (SiO2)
mineral
Gneiss (specifically Banded Gneiss)
Gneiss
metamorphic
Banded Gneiss
Gneiss (Metamorphic high-grade, predominantly SiO2, Al2O3, K2O, Na2O)
metamorphic
Crackle Agate / Dyed Quartz
SiO2 (Silicon Dioxide)
mineral
Quartz Drusy on Matrix
Silicon Dioxide (SiO2)
mineral
Gneiss (specifically Micaceous Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Fancy Jasper
Agate (Silicon Dioxide, SiO2)
sedimentary
Common Opal in Host Rock
Hydrated Silica (SiO2·nH2O)
mineraloid
Weathered metamorphic rock, likely gneiss or schist
Indeterminate foliated silicate rock; commonly quartz–feldspar–mica assemblage
metamorphic
Gneiss
Metamorphic Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Banded Gneiss
Gneiss (Metamorphic rock predominantly containing quartz, feldspar, and mica)
metamorphic
Banded Gneiss
Gneiss (Metamorphic high-grade rock)
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Botryoidal Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (Metamorphic silicate rock)
metamorphic
Gneiss (with Quartzite and Biotite)
Gneiss containing SiO2 (Quartz), K(Mg,Fe)3AlSi3O10(OH)2 (Biotite), and (K,Na,Ca)AlSi3O8 (Feldspar)
metamorphic
Botryoidal Chalcedony (Agate/Desert Rose Chalcedony)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Banded Gneiss
Foliated Gneiss
metamorphic
Botryoidal Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Banded Gneiss (with Quartz Vein)
Gneiss (Metamorphic rock of varying mineralogy)
metamorphic