Banded Agate (Crazy Lace/Mexican Agate Variety)
Silicon Dioxide (SiO2)
mineral
Category
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Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Gneiss (likely)
Gneiss
Metamorphic
Amethyst
Silicon Dioxide (SiO2) with trace Iron (Fe3+)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Amethyst (Tumbled)
Silicon Dioxide (SiO2 with iron impurities)
mineral
Bauxite (Aluminum Ore)
Hydrated aluminum oxides, primarily Al(OH)3, AlO(OH)
sedimentary
Pink Opal
Hydrated silica (SiO2 "n H2O)
mineral
Chalcedony (Yellow/Honey variety)
Microcrystalline Quartz (SiO2)
mineral
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
mineral
Carnelian Agate
Carnelian (Silicon Dioxide - SiO2)
mineral
Moss Agate with Jasper
Chalcedony (SiO2 with inclusions)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Dendritic Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Gold
Native Gold (Au)
mineral
Basalt
Basalt (predominantly Plagioclase Feldspar and Pyroxene)
igneous
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Carnelian
Carnelian (Silicon Dioxide, SiO2)
mineral
Carnelian
Carnelian (variety of Chalcedony, SiO2)
mineral
Amazonite
K(AlSi3O8) - Microcline Feldspar
mineral
Amazonite
Microcline (variety Amazonite) - K(AlSi3O8)
mineral
Carnelian
Carnelian (SiO2 - Chalcedony colored by Iron Oxide)
mineral
Red Jasper
SiO2 (Microcrystalline Quartz)
Mineral
Amazonite
Amazonite (KAlSi3O8)
mineral
Dyed Agate (Tumbled)
Silicon Dioxide (SiO2) - stained microcrystalline quartz
sedimentary
Amethyst
Amethyst (SiO2 with Iron impurities)
mineral
Polished Black Obsidian
Volcanic Glass (70-75% SiO2)
igneous
Native Gold
Native Gold (Au)
mineral
Amethyst (Polished Cabochon)
Silicon Dioxide (SiO2) with iron impurities
mineral
Carnelian Agate
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate/Quartz variety)
Cryptocrystalline Quartz (SiO2)
mineral
Carnelian Agate
Silicon Dioxide (SiO2)
mineral
Carnelian
Carnelian (SiO2 with Iron Oxide impurities)
mineral
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone (lithic wacke)
Arenite / Lithic Wacke (mostly SiO2 with rock fragments)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Amethyst
Quartz (Silicon Dioxide) - SiO2 with Iron impurities
mineral
Amethyst (Faceted Gemstone)
Silicon Dioxide (SiO2) with iron impurities
mineral
ABS Plastic (Acrylonitrile Butadiene Styrene)
(C8H8)x·(C4H6)y·(C3H3N)z
Synthetic Polymer (Synthetic Material)