Mineral Like (Natural Glass)

Yellow Quartz (Citrine Quartzite)

Silicon Dioxide (SiO2)

Wood Beads (Palmwood/Ebony)

Various species for wood, but often refers to woods like Palmwood (e.g., Borassus flabellifer) or Ebony (Diospyros spp.) for their distinctive grain and hardness.

Aquamarine and clear quartz

Aquamarine (Be3Al2Si6O18), Quartz (SiO2)

Quartz (Milky Quartz / Greenish Quartz)

SiO2 (Silicon Dioxide)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Amethyst

Silicon Dioxide (SiO2) with trivalent iron (Fe3+) impurities

Sandstone (Ferruginous)

Arenite (Fe-oxide cemented)

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Clear Quartz

Silicon Dioxide (SiO2)

Smoky Quartz and Orthoclase Feldspar

Granitic Pegmatite (SiO2 + KAlSi3O8)

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Mica-rich Schist fragment

Mica Schist

Sodalite-rich Syenite (Yooperlite)

Sodalite-rich Syenite (Na8(Al6Si6O24)Cl2 within an igneous matrix)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Black Obsidian

Volcanic Glass (SiO2)

Sandstone (likely Arkosic)

Arenite (SiO2 with KAlSi3O8)

Smoky Quartz

SiO2 (Silicon Dioxide)

Obsidian

Volcanic glass (SiO2-rich extrusive igneous rock)

Slag (Industrial By-product)

Anthropogenic Vitreous Silica/Iron Silicate

Quartz

Silicon Dioxide (SiO2)

Quartzite

Quartzite (Primary mineral: SiO2)

Potassium Feldspar (Orthoclase)

KAlSi3O8 (Potassium Aluminum Silicate)

Black Onyx

Silicon Dioxide (SiO2)

Muscovite Mica (Granitic Pegmatite)

Muscovite - KAl2(AlSi3O10)(OH)2

Diamond

Native Carbon (C)

Yellow Ocher / Limonite

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)

Obsidian

Volcanic glass (high silica volcanic rock)

Slag Glass

Amorphous Silica / Glass Slag

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Chert (Cream Variety)

Microcrystalline silica (SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 primarily)

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide)

Granite

Phaneritic intrusive igneous rock (consisting mainly of Quartz, Alkali Feldspar, and Plagioclase)

Yellow Fluorite

Calcium fluoride (CaF2)

Blue Howlite (Dyed)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Pearl

Organic Mineraloid (CaCO3 + Conchiolin)

Muscovite Mica (in Quartz/Feldspar Matrix)

Muscovite - KAl2(AlSi3O10)(OH)2

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

African Turquoise (Jasper)

Silicon Dioxide (SiO2) - Macro-crystalline Quartz with inclusions

Strawberry Quartz (Quartz with Hematite inclusions)

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Sandstone (Ferruginous)

Arenite (with Iron Oxide)