Mineral (Specifically A Mineraloid)

Moss Agate

Chalcedony (Silicon Dioxide, SiO2) with dendritic inclusions

Tumbled Moonstone and Amazonite Chips

Orthoclase (KAlSi3O8) and Microcline (KAlSi3O8) of the Feldspar Group

Milky Quartz

Quartz (Silica / Silicon Dioxide), SiO2

Quartz (Milky or Cloudy Quartz)

Silicon Dioxide (SiO2)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Citrine Quartz

Citrine (Silicon Dioxide, SiO2)

Banded Agate / Lace Agate

Agate (Silica/Quartz) - SiO2

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Garnet (specifically Almandine)

Almandine - Fe3Al2(SiO4)3

Yellow Jasper

Cryptocrystalline Quartz (SiO2)

Citrine Quartz

Quartz (SiO2) - specifically, a variety of macrocrystalline quartz

Citrine

Quartz (SiO2) - specifically, a variety of macrocrystalline quartz

Citrine (likely Heat-Treated Amethyst)

Silicon Dioxide (SiO2)

Dalmatian Stone

Dalmatian Jasper (Aphanitic Igneous Rock with Arfvedsonite inclusions)

Basalt with Vesicle/Vug

Basalt (Aphanitic Mafic Igneous Rock)

Beach Pebble (likely Quartz or Chalcedony)

Silicon Dioxide (SiO2)

Chalcedony (specifically Agate or Carnelian pebble)

Chalcedony (Microcrystalline Quartz, SiO2)

Garnet (specifically Almandine or Pyrope)

Almandine: Fe3Al2(SiO4)3 or Pyrope: Mg3Al2(SiO4)3

Chalcedony (specifically Agate or Moonstone-like Quartz)

Silicon Dioxide (SiO2)

Quartz (specifically Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Quartz (specifically Milky Quartz/Quartzite)

Silicon Dioxide (SiO2)

Agate (specifically Waterline or Onyx-type Agate)

Silicon Dioxide (SiO2) - variety Chalcedony

Chalcedony (Common Opal variant or Agate)

Silicon Dioxide (SiO2)

Basalt (Vesicular)

Basalt (Mafic Extrusive Igneous Rock)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Granite (Alkali-feldspar Granite)

Felsic Plutonic Rock (Primary minerals: Quartz SiO2, Orthoclase KAlSi3O8, Plagioclase (Na,Ca)AlSi3O8)

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Quartz (Milky/Opaque variety)

Silicon Dioxide (SiO2)

Polished Basalt

Basalt (Mafic volcanic rock)

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Green Calcite

Calcium Carbonate (CaCO3)

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Moonstone (specifically Rainbow Moonstone / White Labradorite)

White Labradorite (Feldspar Group: (Na,Ca)(Al,Si)4O8)

Diamond

Carbon (C), specifically in an isometric crystal system.

Pyrite

Iron Sulfide (FeS2)

Fluorite

Calcium Fluoride (CaF2)

Quartz (specifically Quartzite or Massive Quartz)

Silicon Dioxide (SiO2)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Aventurine (specifically Green Aventurine)

Silicon Dioxide (Quartz) with inclusions of Fuchsite; SiO2 + K(Al,Cr)2AlSi3O10(OH)2

Sandstone (likely Greywacke or Siltstone variety)

Arenite / Siltstone (primarily SiO2)