Synthetic (Not A Rock Or Mineral)

Banded Agate (specifically Botswana Agate or Water-line Agate)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Sandstone (likely Quartzose)

Sandstone (Principally SiO2)

Schist

Schist (various mineralogical compositions including mica, chlorite, talc, etc.)

Dragon Blood Jasper

Epidote with Pietersite or Red Jasper (Ca2Al2Fe3+[Si2O7][SiO4]O(OH))

Gneiss

Gneiss

Turquoise in Matrix

Hydrous phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O

Blue Chalcedony

Microcrystalline Quartz (SiO2)

Granite Gneiss

Gneiss (derived from granitic protolith)

Dendritic Opal

Opalized Chalcedony with Manganese Inclusions (SiO2 · nH2O)

Granite

Granite

Banded Gneiss with Quartz Vein

Foliated Metamorphic Rock (Gneiss)

Sandstone

Arenite (composed primarily of SiO2)

Blue Lace Agate

Chalcedony (a form of Quartz) - SiO2

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Chert (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)

Rose Quartz

Silicon dioxide with traces of titanium, iron, or manganese (SiO2)

Amethyst

Amethyst (SiO2 with iron impurities)

Quartz (Milky Quartz / Quartzite)

Silicon Dioxide (SiO2)

Granite

Felsic Intrusive Igneous Rock

Sandstone

Arenite (Clastic Sedimentary Rock)

Drill Core Samples (Varied Lithology)

Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)

Sandstone Concretion with Quartz Center

Sedimentary Clastic Rock (SiO2 matrix with Quartz core)

Obsidian

Amorphous volcanic glass (primarily SiO2)

Sandstone

Arenite (SiO2 based with various mineral cements)

Sandstone

Arenite (primarily SiO2)

Sandstone (Yellow/Siltstone variant)

Arenite (SiO2 primarily)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Limonite Concretion

Goethite-rich Concretion (FeO(OH))

Sandstone (Ferruginous)

Arenite (Fe2O3 enriched)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Basalt with Quartz/Calcite Veins

Basalt (Aphanitic Mafic Volcanic Rock) with Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) inclusions

Quartz (Water-worn pebble)

Silicon Dioxide (SiO2)

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)

Sandstone (Ferruginous)

Arenite (with high iron oxide content)

Ferruginous Sandstone (Ironstone)

Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Sandstone (Ferruginous)

Clastic Sedimentary Rock (Litharenite)

Schist

Mica Schist (contains muscovite/biotite and quartz)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Jasper (specifically Polychrome or Desert Jasper)

Silicon Dioxide (SiO2) with iron oxide and other mineral impurities