Mineral (Variety Of Chalcedony)

Rose Quartz

Quartz (Silicon Dioxide, SiO2)

Granite

Granite (Phaneritic intrusion / SiO2 + KAlSi3O8 + NaAlSi3O8)

Quartz (possibly Citrine or Smoky Quartz variety)

Silicon Dioxide (SiO2)

Chert (Green variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

Plagioclase Feldspar (specifically Albite/Oligoclase)

(Na,Ca)(Si,Al)4O8

White Quartz

Silicon Dioxide (SiO2)

Kyanite (in Schist Matrix)

Kyanite (Al2SiO5)

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Obsidian

Volcanic glass

Rose Quartz

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

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

Granite

Phaneritic Felsic Igneous Rock

Schist

Schist (various mineral compositions)

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')

Calcite (Calcium Carbonate, CaCO3)

Chert (also known as Flint or Common Chalcedony)

Cryptocrystalline Silica (SiO2)

Quartzite (specifically Milky Quartz variety)

Quartz (SiO2)

Basalt with Scoria/Vesicular Texture

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Sandstone (Quartzite-rich Cobble)

Clastic sedimentary rock (primarily SiO2)

Rose Quartz

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

Botryoidal Hematite (Kidney Ore)

Hematite (Fe2O3)

Garnet (likely Almandine or Pyrope)

Garnet Group (e.g., Almandine: Fe3Al2(SiO4)3; Pyrope: Mg3Al2(SiO4)3)

Citrine

SiO2 (Silicon Dioxide)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Black Freshwater Pearls

Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3

Serpentinite

Serpentinite (complex silicate minerals including Mg3Si2O5(OH)4)

Scoria

Scoria (a vesicular basalt or andesite)

Rose Quartz

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

Rose Quartz

Silicon Dioxide (SiO2) with trace impurities of Titanium, Manganese, or Iron

Yellow Quartz (Citrine Quartz variety / Ferruginous Quartz)

Silicon Dioxide (SiO2) with iron inclusions

Chert (variations include Flint/Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Conglomerate (River Rock)

Clastic sedimentary rock (primarily SiO2)

Conglomerate

Conglomerate (Rock composed predominantly of rounded clasts > 2mm)

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)

Shale or Mudstone (Based on appearance)

Shale (fine-grained, laminated fissile sedimentary rock) / Mudstone (fine-grained, non-fissile sedimentary rock)

Quartz

Quartz (SiO₂)

Clear Quartz (or Rock Crystal)

Quartz (SiO₂ - Silicon Dioxide)

Basalt

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Yellow Jasper

Jasper, a microcrystalline variety of Quartz (SiO2) with iron inclusions

Black Limestone with Calcite Veining

Bituminous Limestone (CaCO3 with Organic Carbon inclusions)

Chert (variously known as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)