Sedimentary (With Some Aspects Of Mineral Replacement)

Chert (specifically Flint or Common Chert)

Silicon Dioxide (SiO2)

Brachiopod Fossil in Chert

Phylum Brachiopoda within Microcrystalline Quartz (SiO2)

Tufa

Calcareous Tufa (CaCO3)

Hypersthene

(Mg,Fe)SiO3 - Enstatite-Ferrosilite series

Quartz (Crystal/Druzy Quartz)

Quartz (SiO₂)

Kambaba Jasper

Stromatolite (Microbial mat fossil in silicified sediment)

Sandstone

Arenite (a specific type of sandstone with less than 15% matrix)

Chert (Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Red Jasper

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

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.

Fluorite

Fluorite (Calcium Fluoride - CaF2)

Aquamarine with Sunstone

Aquamarine (Be3Al2Si6O18), Sunstone (Na,Ca)Al(Si,Al)Si2O8

Handaxe with Inlaid Fossil Echinoid

Flint / Chert (SiO2) containing a fossil Conulus albogalerus

Red Jasper (beads)

Silicon Dioxide (SiO2) with iron inclusions

Tiger's Eye (Rough)

Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)

Ruby

Corundum (Aluminum Oxide with Chromium), Al2O3:Cr

Chert (Arrowhead or Projectile Point)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Serpentinite

Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Nacre (Mother of Pearl)

Nacre (Biogenic Aragonite/Calcite composite, CaCO3)

Jasper, Agate, Quartz Mix (Polished Beads)

SiO₂ (Silicon Dioxide) for Quartz. Jasper and Agate are cryptocrystalline varieties of Quartz.

Jasper (likely Kambaba or Crocodile Jasper variety)

Silicon Dioxide (SiO2) with inclusions

Yellow Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

Quartz (Smoky/Milky Variety)

Silicon Dioxide (SiO2)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Greenstone

Greenschist (primarily composed of chlorite, actinolite, and epidote)

Smoky Quartz

Silicon Dioxide (SiO2)

Rhodonite

Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3

Smoky Quartz

Silicon Dioxide (SiO2)

Chert (Nodule)

Chert (mainly Microcrystalline or Cryptocrystalline Quartz, SiO2)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) with iron oxide inclusions

Greenstone with Quartz Veining

Epidiorite or Metabasalt with SiO2 (Quartz) veins

Tiger's Eye (Rough Slab)

Pseudomorph of Quartz after Crocidolite (SiO2 with Fe-containing inclusions)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Limonite (Iron Ore/Hydrated Iron Oxide)

Limonite (mixture of FeO(OH)·nH₂O minerals, mainly Goethite, FeO(OH) and Lepidocrocite, FeO(OH))

Epidote

Epidote (Ca2(Al2,Fe3+)AlSi3O12(OH))

Chert

Chert (microcrystalline quartz)

Tiger's Eye (Blue-Gold transition)

Pseudomorph of Quartz after Crocidolite (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz (with inclusions)

Silicon Dioxide (SiO2)