Banded Chert / Sandstone Pebble
Microcrystalline Quartz (SiO2) / Silicified Sandstone
sedimentary
Category
Organic (Paper And Cellulose)
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Chert (Nodule / Geode fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Quartz Pebble)
Silicon Dioxide (SiO2)
sedimentary
Fossiliferous Limestone
Limestone (CaCO3 with Limonite/Goethite staining)
sedimentary
Travertine (Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Zebra Marble
Metamorphosed Alabaster/Limestone (CaCO3)
metamorphic
Chert (Nodular)
Chert (SiO2 - Microcrystalline Quartz)
sedimentary
Chert (Iron-Stained)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a secondary sedimentary structure
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Ironstone Concretion / Goethite-Hematite Geode
Goethite / Hematite Concretion (Fe3O4 / FeO(OH) / Fe2O3)
sedimentary
Bituminous Coal
Coal (Organically derived sedimentary rock)
sedimentary
Amber
Succinite (organic gemstone, approx. C10H16O)
fossil
Sandstone with Trace Fossils
Quartz Arenite with Bioturbation (Trace Fossils)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclasts
sedimentary
Amber
Succinicum (Organic polymer, largely C10H16O)
Organic Mineral
Opalite
Synthetic Opalised Glass
Mineral (Synthetic / Man-made)
Limestone River Pebble
Calcium carbonate (CaCO3) - micritic limestone
sedimentary
Black Beach Pebble (Basalt / Slate Pebble)
Rounded Fine-Grained Clastic / Igneous Rock Pebble
sedimentary
Arid Sandy Loam
Arenosols / Regosols
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Organic Inclusions
fossil
Amber
Succinite (fossilized tree resin, C10H16O)
fossil
Red Sandstone with Reduction Spot
Quartzose Sandstone with a Leach/Reduction Spot
sedimentary
Amber
Succinite (specifically for Baltic amber); Approximate formula: C10H16O
Organic Gemstone (Mineraloid)
Amber
Succinite (a specific common type) or Fossilized Tree Resin (C10H16O)
Mineraloid
Chert (variant Flint/Jasper)
Microcrystalline Opaline Silica (SiO2)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxides
mineral
Tree Agate (or Moss Agate)
Dendritic Agate (Silicon Dioxide - SiO2)
mineral
Fossil Coral
Phylum Cnidaria / Rugosa or Tabulata
fossil
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Amber
Succinite (a Fossilized Tree Resin); Chemical formula is approximately C10H16O
Organic mineraloid
Shale
Shale (fine-grained clastic sedimentary rock)
Sedimentary
Chert (Brecciated Chert)
Silicon Dioxide (SiO2)
sedimentary
Amber
Fossilized Tree Resin (C10H16O)
mineral
River Stone (likely Mudstone or Siltstone)
Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)
sedimentary
Petrified Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Moss Agate
Silicon Dioxide (SiO2) with inclusions of hornblende, chlorite, or manganese/iron oxides
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
Mineral (Variety of Chalcedony)
Baltic Amber
Succinite (Polmerized conifer resin)
mineraloid
Moss Agate
Chalcedony (Silicon Dioxide with inclusions) - SiO2
mineral
Pearl
Aragonite and Conchiolin (CaCO3 + organic protein)
mineraloid
Shale with Vein Infillings
Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.
Sedimentary Rock