Organic (Geological Relative)

Blue Lace Agate

Chalcedony (a form of Quartz) - SiO2

Yellow Chalcedony

Chalcedony (a cryptocrystalline variety of Quartz, SiO₂)

Blue Apatite

Apatite, Ca5(PO4)3(F,Cl,OH)

Calcite

Calcite (CaCO₃)

Cockle Shell (Fossil or Recent)

Class Bivalvia, Family Cardiidae (e.g., Cerastoderma edule for common cockle)

Ironstone Concretion (likely)

Goethite/Hematite/Limonite cemented sediment

Chalcedony

Chalcedony (SiO₂)

Chrysoprase

Chalcedony (cryptocrystalline quartz) with nickel inclusions; SiO2

Amazonite

KAlSi3O8 (Potassium Feldspar, variety of Microcline)

Sandstone

Sandstone (various mineral compositions)

Slate

Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.

Unakite

Epidote-Feldspar rock (specifically, a variety of granite)

Citrine

Quartz (SiO₂)

Banded Jasper

Silicon Dioxide (SiO2)

Moss Agate

Moss Agate (a variety of Chalcedony, SiO ₂)

Crushed Limestone

Calcium Carbonate (CaCO3)

Aragonite

Aragonite (Carbonate mineral), CaCO3

Sandstone with Liesegang Rings

Arenite with secondary Iron oxide (Limonite/Goethite) precipitation

Serpentinite (Serpentine Rock)

Serpentinite is a rock composed of one or more serpentine group minerals, chiefly antigorite, chrysotile, and lizardite, with the general formula (Mg,Fe)3Si2O5(OH)4. Often includes other minerals like magnetite, talc, and chromite.

Pink Opal

Hydrated Silica (SiO2·nH2O)

Red Chalcedony (likely dyed)

Chalcedony (a variety of Quartz), SiO2

Blue Chalcedony

Chalcedony (a cryptocrystalline variety of Quartz - SiO₂)

Lepidolite

K(Li,Al)3(Si,Al)4O10(F,OH)2

Calcite

Calcite (CaCO3)

Ferruginous Sandstone (Ironstone)

Sedimentary rock with Limonite/Goethite cement

Fossiliferous Limestone

Fossiliferous Limestone

Anthracite Coal

Anthracite

Shale

Mudstone (composed primarily of clay minerals like kaolinite, illite, and smectite, with quartz and calcite)

Iron Ore / Ironstone Concretion

Mixture of iron oxide/hydroxide minerals, likely some combination of Hematite (Fe2O3), Goethite (α-FeOOH), and Limonite (a general term for hydrated iron oxides of variable composition) or potentially Bauxite (a mixture of aluminum hydroxides, often with iron oxides, (Al(OH)3) and FeO(OH)). The visual characteristics strongly suggest iron-rich material.

Quartz (chalcedony variety) or Limestone with Quartz Veins

SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)

Schist

Schist (various mineral compositions)

Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)

Chalcedony (SiO2), Jasper (SiO2 with impurities)

Ironstone concretion / Limonitic Sandstone

Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)

Aventurine (likely Green Aventurine)

Quartz (SiO2) with included minerals (Fuchsite or Chlorite for green color)

Mookaite Jasper

Siliceous sedimentary rock (variety of Jasper/Chert)

Quartz (possibly milky quartz)

Quartz (Silica; SiO₂)

Coral Fossil (Petrified Coral)

Scleractinia (Order) - Calcified Fossil Skeleton (CaCO3)

Blue Chalcedony and Picture Jasper Beads

Blue Chalcedony (SiO2), Picture Jasper (SiO2)

Slate

Slate (foliated metamorphic rock, primarily composed of quartz, illite, chlorite, and micas)

Calcite

Calcite (Mineral; CaCO₃)

Anthracite Coal

Anthracite (Carbon-based metamorphic rock, 86-97% C)

Coal (Bituminous)

Organic sedimentary rock primarily consisting of carbon (C)