Organic Gemstone (Not A Rock Or Mineral In The Traditional Sense, But Bio Mineralized Material)

Clear/White Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Chert (Jasper variety) with Iron Oxide staining

Cryptocrystalline Quartz (SiO2) with Goethite/Limonite impurities

Granitic Pegmatite

Granite Pegmatite (principally KAlSi3O8, SiO2, and KAl2(AlSi3O10)(OH)2)

Quartz (River Pebble)

Quartz (SiO₂ - Silicon Dioxide)

Black Star Diopside

Diopside (CaMgSi2O6) with asterism

Quartz

Silicon Dioxide (SiO2)

Quartz (possibly milky quartz or quartz with inclusions)

SiO2 (Silicon Dioxide)

Amethyst

SiO2 (Silicon Dioxide)

Tiger's Eye

Silicon dioxide with crocidolite fibers (SiO2 with chrysotile amphibole inclusions)

Fluorite (Green Fluorite on Host Rock)

Fluorite (Calcium Fluoride, CaF2)

Granite (weathered/river-tumbled)

Granite (Plutonic Igneous Rock)

Peridot (Olivine)

Olivine, (Mg,Fe)2SiO4

Goldstone (Red/Brown)

Aventurine Glass (SiO2 with Copper inclusions)

Aquamarine

Aquamarine (Beryl variety) - Be3Al2(Si6O18)

Shell Cameo (Sardonyx Shell)

Cassis madagascariensis (Sardonyx shell)

Chert Pebble/Nodule

Chert (a microcrystalline or cryptocrystalline sedimentary form of quartz, SiO2)

Lapis Lazuli

Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2

Fluorite in Matrix

Fluorite (CaF2) within a host rock matrix

Rough Garnet in Matrix

Almandine Garnet (Fe3Al2Si3O12)

Slag

Anthropogenic Vitrophyre (Iron or Smelting Slag)

African Turquoise (Jasper)

Polychrome African Jasper (often marketed as 'African Turquoise' due to its color, but it is not true turquoise)

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2, with varying amounts of Calcite, Pyrite, and Sodalite).

Black Tourmaline (Schorl)

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

Marble

Marbles are primarily composed of calcite (calcium carbonate, CaCO3) or dolomite (calcium magnesium carbonate, CaMg(CO3)2).

Serpentinite (Serpentine Rock)

Serpentinite is a rock composed of one or more serpentine group minerals, chiefly antigorite, chrysotile, and lizardite, with the general formula (Mg,Fe)3Si2O5(OH)4. Often includes other minerals like magnetite, talc, and chromite.

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Jasper (specifically Brecciated or Agated Jasper)

Silicon Dioxide (SiO2) - Chalcedony with impurities

Quartz (likely a clear or rock crystal variety)

Quartz (SiO2 - Silicon Dioxide)

Amethyst

SiO2 (Silicon Dioxide) - a variety of Quartz

Wood Jasper

Siliceous sedimentary rock (variety of Chert/Chalcedony)

Quartz (likely a weathered/tumbled piece)

Quartz (SiO₂)

Diamond

Carbon (C)

Granite

Granite (a felsic intrusive igneous rock composed primarily of quartz, feldspar, and mica)

Diamond

Diamond (C)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Blue Chalcedony

Chalcedony (a cryptocrystalline variety of Quartz - SiO₂)

Agate

Chalcedony (cryptocrystalline quartz)

Sunstone

Plagioclase Feldspar (specifically Oligoclase variety containing hematite or goethite inclusions)", composition: (Ca,Na)(Al,Si)2Si2O8

Banded Chert in Matrix

Microcrystalline Quartz (SiO2)

Amethyst (Quartz)

SiO2 (Silicon Dioxide)

Lapis Lazuli

Lapis Lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Pyrite, and Calcite)

Granitic Pegmatite

Coarse-grained Granite (KAlSi3O8 + SiO2)