Mineral, Often Found As A Rock (Metamorphic)

Jasper (likely Brecciated or Multi-colored)

Jasper (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Tiger's Iron

Pseudomorphic Quartz Aggregate (contains SiO2 with Fe2O3 and FeOOH)

Tiger's Eye

Pseudomorph of quartz after crocidolite (SiO2 with iron oxide inclusions)

Quartzite

Quartzite (primarily SiO2)

Sandstone (Graywacke)

Clastic Sedimentary Rock (Lithic Sandstone)

Quartz (specifically Milky or Clear Quartz)

Silicon Dioxide (SiO2)

Slate

Slate (Metamorphic Rock)

Smoky Quartz

Silicon dioxide (SiO2)

Smoky Quartz (Tumbled)

Smoky Quartz (SiO2 - Silicon Dioxide)

Larimar

Pectolite (Sodium Calcium Silicate Hydroxide) - (NaCa2(Si3O8)(OH))

Rhodonite

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

Chalcedony (Banded/Mottled Variety)

Chalcedony (a cryptocrystalline variety of Quartz, SiO2)

Peach Moonstone

Orthoclase Feldspar (KAlSi3O8)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Sandstone (Iron-stained)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Gneiss

Metamorphic Gneiss (High-grade regional metamorphism)

Ferruginous Quartz Cobble

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Amethyst on Agate/Basalt Matrix

Silicon Dioxide (SiO2) with iron impurities

Eclogite

Eclogite (Omphacite-Garnet Rock)

Wishing Stone (Quartz-Veined Pebble)

Hydrothermal Quartz in Metasedimentary Matrix (SiO2/Matrix)

Greenschist / Migmatite

Regional Metamorphic Complex (Facies: Greenschist to Amphibolite)

Mica Schist

Mica Schist (primarily Muscovite and Biotite KAl2(AlSi3O10)(OH)2)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone.

SiO2 (Silicon Dioxide)

Gneiss

Metamorphic Rock (Gneissic texture)

Quartzite (Sugar Quartz)

Quartzite (primarily SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Biotite (Mica)

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

Granite Gneiss

Gneiss (High-grade Metamorphic Rock)

Quartzite

Quartzite (primarily SiO2)

Serpentinite

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

Gneiss

Gneiss

Green Aventurine (Green Quartzite)

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Quartzite River Rock

Metaquartzite (majorly SiO2)

Chalcopyrite

Chalcopyrite (CuFeS2)

Fuchsite

Cr-bearing Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Milky Quartz

Silicon Dioxide (SiO2)