Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide staining)
sedimentary
Category
Organic Gem Material (Botanical)
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Sandstone (likely Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Sandstone
Arenite (primarily Quartz Arenite)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe2O3 enriched)
sedimentary
Gold Nugget
Native Gold (Au)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Sandstone (likely Siltstone or fine-grained Sandstone)
Sedimentary Rock (Clastic)
sedimentary
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Quartzite and Sandstone Pebbles
Silicon dioxide (SiO2)
metamorphic and sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone (Wonderstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Yellow Quartzite (River Pebble)
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Sandstone
Arenite
sedimentary
Sandstone (Calcareous Sandstone)
Calcareous Sandstone (primarily SiO2 with CaCO3 cement)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Sandstone (Quartz Arenite)
Sandstone (dominated by SiO2 quartz grains)
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Ferruginous)
Sandstone (SiO2 with iron oxides)
sedimentary
Siltstone Pebble
Siltstone (fine-grained siliciclastic sedimentary rock)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Arkose or Quartz Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Amber
Fossilized Tree Resin (Successite)
fossil
Fossiliferous Limestone
Limestone (CaCO3 - Calcium Carbonate)
sedimentary
Amber
Succinite (C10H16O)
mineral
Pyrite in Shale
Iron Disulfide (FeS2) in Argillaceous Shale
sedimentary
Green Moss Agate
Agate (Silicon Dioxide - SiO2) with inclusions of hornblende or chlorite
mineral
Pink Opal
Amorphous Hydrous Silica (SiO2·nH2O)
mineral
Amber
Succinite (specifically for Baltic amber; fossilized tree resin)
Organic (Sedimentary-associated)
Pink Opal
Hydrated Amorphous Silica (SiO2·nH2O)
mineraloid
Moss Agate and Hematite
Silica (SiO2) with fibrous inclusions of Manganese or Iron; Hematite (Fe2O3)
mineral
Diorite
Diorite (intermediate intrusive igneous rock)
igneous
Milky Quartz/Gray Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Thulite in Matrix
Pink Zoisite - Ca2Al3(SiO4)3(OH)
metamorphic
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide Fe2O3 cement)
sedimentary
Labradorite
(Ca, Na)(Al, Si)4O8 (Plagioclase Feldspar)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral