Sandstone
Arenite
sedimentary
Category
Not A Rock
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Quartz Geode
Crystalline Silver Oxide (SiO2) in Calcareous Host
mineral
Sandstone
Arenite (Sandstone)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite (primarily Quartz Arenite)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Vitreous Silica with Spherulite inclusions (Amorphous SiO2)
igneous
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Picture Sandstone)
Arenite (primarily SiO2)
sedimentary
Snowflake Obsidian
Obsidian with Cristobalite inclusions (70–75% SiO2)
igneous
Yellow Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Jasper (likely Iron-stained)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2)
mineral
Calligraphy Stone
Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
metamorphic
Red Jasper with Quartz Veining
Jasper (Silicon Dioxide, SiO2) with Quartz (SiO2) inclusions
sedimentary
Obsidian
Volcanic Glass (70-75% SiO2)
igneous
Fossiliferous Limestone
Biogenic Limestone (CaCO3)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
sedimentary
River Pebble (Likely Quartzite or Chert)
Quartzite (primarily SiO2)
metamorphic
Sandstone
Arenite (specifically Quartz Arenite)
sedimentary
Jasper (Green Jasper / River Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary
Sandstone
Arenite
sedimentary
Banded Agate (specifically Botswana Agate or Water-line Agate)
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Jasper with Quartz Veins
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Jasper (Iron-stained Quartzite/Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Tree Agate
Chalcedony with Dendritic Chlorite (SiO2 with impurities)
sedimentary/mineral
Quartz Geode
Silicon Dioxide (SiO2) - Crystalline Quartz
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (often composed of Quartz, SiO2)
sedimentary
Moss Agate
Chalcedony (Silicon Dioxide / SiO2)
mineral
Snowflake Obsidian
Volcanic glass with Spherulite inclusions (SiO2)
igneous
Yellow Quartzite (River Pebble)
Quartzite (primarily SiO2 with iron oxide inclusions)
metamorphic
Jasper (brecciated or orbicular variety)
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary/mineral
Sandstone (Wonderstone)
Arenite with Liesegang rings
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Snowflake Obsidian
Volcanic glass with Phenocrysts (SiO2 with Cristobalite inclusions)
igneous