Mineral (Specifically A Gemstone Variety)

Green Chert (Jasper)

Silicon Dioxide (SiO2)

Labradorite

(Ca, Na)(Al, Si)4O8 (Calcium Sodium Aluminum Silicate)

Green Calcite (often commercially called Green Onyx)

Calcium Carbonate (CaCO3)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Flint / Chert

Silicon Dioxide (SiO2)

Peach Moonstone

Orthoclase Feldspar (KAlSi3O8)

Milky Quartz

Silicon Dioxide (SiO2)

Carnelian

Carnelian Chalcedony (SiO2 with Iron Oxide impurities)

Ruby (Corundum)

Corundum (Aluminum Oxide with Chromium), Al2O3:Cr

Labradorite

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

Fancy Jasper

Jasper (Cryptocrystalline Quartz, SiO2)

Polished green-and-white jasper (likely ocean jasper or orbicular jasper)

Microcrystalline quartz/chalcedony (SiO₂) with chlorite, epidote, calcite, and iron-oxide inclusions

Selenite

Gypsum (CaSO4·2H2O), specifically the crystalline variety Selenite

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz or Moonstone

Silicon Dioxide (SiO2) or Potassium Aluminum Silicate (KAlSi3O8)

Feldspar (specifically Orthoclase or Plagioclase)

Potassium Aluminum Silicate (KAlSi3O8) or Sodium/Calcium Aluminum Silicate

Montana Moss Agate

Chalcedony (Silicon Dioxide, SiO2)

Raw Citrine (Yellow Quartz)

Citrine / Silicon Dioxide (SiO2)

Specular Hematite (Specularite)

Iron(III) oxide (Fe2O3)

Larimar

Blue Pectolite (NaCa2Si3O8(OH))

Milky Quartz

Silicon Dioxide (SiO2)

Moonstone

Adularia (Potassium Aluminum Silicate, KAlSi3O8)

Chert (Flint)

Silicon Dioxide (SiO2)

Fancy Jasper

Cryptocrystalline Quartz (SiO2) with iron oxide inclusions

Sandstone (Graywacke)

Clastic Sedimentary Rock (Lithic Sandstone)

Yellow Quartz (Citrine or Iron-Stained Quartz)

Silicon Dioxide (SiO2)

Chlorastrolite (Isle Royale Greenstone)

Chlorastrolite (Pumpellyite-(Mg,Al)), formula: Ca2(Mg,Fe)Al2(SiO4)(Si2O7)(OH)2∙H2O

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite or Limonite inclusions

Moonstone

Orthoclase (Potassium Aluminum Silicate, KAlSi3O8) with inclusions of Albite

Amazonite

Potassium Feldspar (Microcline), K(AlSi3O8)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Chlorastrolite (Isle Royale Greenstone)

Chlorastrolite (Pumpellyite-(Mg,Fe2+): Ca2MgAl2(Si2O7)(SiO4)(OH)2∙H2O)

Milky Quartz

Silicon dioxide (SiO2)

Red Jasper with Quartz

Microcrystalline Quartz (SiO2)

Pink Granite

Granite (Alkali-feldspar granite)

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Ruby

Corundum (Al2O3 with Chromium traces)

Yellow Calcite

Calcium Carbonate (CaCO3)

Red Jasper

Silicon dioxide (SiO2) with iron oxide (Hematite) inclusions

Chert (Flint) with Limestone Matrix

Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)

Mixed Gemstone and Mineral Collection

Mixed Silica and Carbonate minerals (SiO2, CaSO4·2H2O, etc.)

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (goethite)