Sedimentary Rock (Possibly Conglomerate Or Breccia With A Quartz Vein)

Fired Clay Brick (Anthropic Rock substitute)

Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)

Black Tourmaline

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

Pyrite

Iron Pyrite (FeS2)

Jasper

Silicon Dioxide (SiO2)

River Cobble (Gneiss/Migmatite)

Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)

Fluorite

Fluorite (CaF₂)

White Howlite

Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)

Gneiss

Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica/Amphibole)

Amazonite

KAlSi3O8 (Potassium Aluminum Silicate) - a variety of Microcline Feldspar

Chert / Flint (a variety of Chert)

Chert (SiO2)

River Rock (Glacial Cobbles)

Fluvial Alluvium (Mixed lithology including Quartzite, Basalt, and Granite)

Gneiss

Gneiss (Metamorphic rock of variable composition, typically SiO2 rich)

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Conglomerate

Conglomerative Rudite (SiO2/CaCO3 matrix)

Jasper with Hematite (Red Jasper)

Silicon Dioxide with Iron Oxide (SiO2 and Fe2O3)

Muscovite Mica

Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2

Peridot and Citrine Gemstones (in a ring setting)

Peridot (Olivine: (Mg,Fe)2SiO4), Citrine (Quartz: SiO2)

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Jasper River Pebble

Silicon Dioxide (SiO2)

Chert (Flint)

Chert (SiO2)

Banded Calcite (often sold as 'Mexican Onyx')

Calcite (Calcium Carbonate, CaCO3)

Chakra Stone (Composite / Man-made Bonded Gemstones)

Composite of Quartz, Lapis Lazuli, Aventurine, Tiger's Eye, and Jasper (SiO2, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, etc.)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Pink Stained Rock (Likely Quartzite or Sandstone with Iron Oxide Staining)

Quartzite (metamorphic) or Sandstone (sedimentary); coloration likely due to hematite or other iron oxides.

Graphite

Graphite (Carbon, C)

Ocean Jasper

Silicon Dioxide (SiO2)

Carnelian

Carnelian (a variety of Chalcedony, which is a microcrystalline quartz, SiO2)

Brecciated Quartzite

Brecciated Quartzite

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)

Chrysoprase

Chrysoprase (a variety of Chalcedony, SiO₂)

Jasper

Jasper (a variety of Chalcedony, SiO2)

Galena

Galena (Lead Sulfide), PbS

Amazonite

KAlSi3O8 (Potassium Feldspar, variety of Microcline)

Schist

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

Banded Gneiss

Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica)

Dark Igneous Rock (Likely Basalt or Diabase)

Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.

Banded Gneiss

Gneiss

Chrysoprase

Chalcedony (cryptocrystalline quartz) with nickel inclusions; SiO2

Red Jasper

Jasper (a variety of Chalcedony, SiO₂ with iron oxide inclusions)

Granite or Granodiorite (weathered fieldstone)

Granitoid

Quartz Druzy on Agate (River Cobble)

Silicon Dioxide (SiO2)

Gneiss (likely)

Gneiss