Anthropogenic Sedimentary Style Organic Solid

Iron-stained chert or siliceous mudstone

Microcrystalline quartz (SiO₂), likely chert with hematite/goethite staining

Shale with Vein Infillings

Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.

Quartz Geode

Silicon Dioxide (SiO2)

Geode (unopened nodule)

Silicon Dioxide (SiO2) Nodule

Yellow Ochre (Limonite)

Limonite (FeO(OH)·nH2O)

Chert (Mookaite style Jasper)

Microcrystalline Quartz (SiO2) with Hematite/Goethite inclusions

Quartz Geode

Silicon Dioxide (SiO2)

Geode (unopened)

SiO2 - Chert-shelled concretion (mostly Quartz)

Quartz Geode (with possible Manganese or Goethite coating)

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Chert / Jasper

Microcrystalline Quartz (SiO2)

Yellow Jasper

Silicon dioxide (SiO2)

Dragon Vein Agate

Chalcedony (cryptocrystalline Quartz), SiO2

Turquoise

Turquoise - CuAl6(PO4)4(OH)8·4H2O

Opal

Hydrated Silica (SiO2·nH2O)

Coal

Coal (Combustible sedimentary rock)

Petrified Wood

Silicified wood (Quartz/Chalcedony replacement of organic matter)

Smoky Quartz (Herkimer-style)

Silicon Dioxide (SiO2)

Geode (Chert/Quartz)

Silicon Dioxide (SiO2)

Concrete-like aggregate surface with embedded rock fragments

Anthropogenic concrete or exposed aggregate; not a natural rock specimen

Hematite Nodules (Moqui Marbles style)

Iron Oxide (Fe2O3)

Painted River Pebble (likely Basalt or Greywacke)

Aphanitic Lithic Clast with Anthropogenic Pigment coating

Banded Chert (Wonderstone-style)

Silicon Dioxide (SiO2)

Coal (Anthracite or Bituminous)

Lithified plant matter (Carbon)

Dead Sea Salt Crust

Halite (NaCl)

Geode with Quartz/Chalcedony

Silicon Dioxide (SiO2)

Chert Breccia

Brecciated Microcrystalline Quartz (SiO2)

Seam Agate

Agate (Banded variety of Chalcedony, SiO2)

Geode Nodules / Chert Pebble

Silicon Dioxide (SiO2) / Quartz concretion

Quartz Geode (partially opened)

Silicon Dioxide (SiO2) with iron staining

Quartz Vein in Siltstone

Siltstone with Quartz (SiO2) inclusion

Quartzite Geode (unopened)

SiO2 (Silicon Dioxide)

Conglomerate

Clastic sedimentary rock (Conglomerate)

Red Jasper

Silicon dioxide with iron impurities (SiO2)

Metaconglomerate

Protolith: Conglomerate (comprising SiO2, Al2O3, etc.)

Inlaid stone ring (likely jasper or agate)

Likely microcrystalline quartz (chalcedony, SiO₂), possibly jasper, with decorative mineral inlays

Quartz-veined Mudstone or Argillite

SiO2 (Quartz) in Siltstone/Mudstone matrix

Quartz Geode (partially filled/solid)

Silicon Dioxide (SiO2)

Quartz Geode

Clear Quartz (Silicon Dioxide, SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Botryoidal Goethite on Quartz

Goethite (α-Fe3+O(OH)) on Quartz (SiO2)

Ambergris

Ambrein (C30H52O)