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White Howlite

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

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Sandstone (likely Arkosic)

Arenite (SiO2 with KAlSi3O8)

Bloodstone

Heliotrope (cryptocrystalline Quartz, SiO2 with inclusions of Hematite)

Ferruginous Sandstone

Sandstone (arenite) with Limonite/Goethite cement

Jasper with Quartz Veining

Silicon Dioxide (SiO2) with impurities

Granodiorite (or Granite) Pebble

Phaneritic Felsic Igneous Pebble

Chert (Yellow Jasper)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Graphite Schist

C (Carbonaceous Schist)

Red Jasper

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Nephrite Jade

Calcium Magnesium Iron Silicate Hydroxide - Ca2(Mg,Fe)5Si8O22(OH)2

Quartz (Iron-stained or Rose variant)

Silicon Dioxide (SiO2)

Clear Quartz (Herkimer Diamond variant)

Silicon Dioxide (SiO2)

Ferruginous Sandstone (Ironstone)

Sandstone with Hematite/Goethite cement (SiO2 + FeO(OH))

Oolitic Limestone (Egg Stone)

Oolite (Chemical sedimentary rock, primarily CaCO3)

Bumblebee Jasper (technically a type of Agate/Anhydrite)

Calcite and Anhydrite with inclusions of Realgar and Orpiment (As2S3)

Labradorite

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

Rainbow Hematite (Man-made/Treated)

Tumbled Hematite with Titanium/Anodized coating (Iron(III) oxide, Fe2O3)

Native Copper (in coinage alloy)

Copper (Cu)

Jasper

Jasper (Silicate mineral, SiO2)

Quartz (Microcrystalline/Chert)

Silicon Dioxide (SiO2)

Moonstone

Adularia (orthoclase) or Albite (plagioclase), a feldspar mineral (KAlSi3O8 or NaAlSi3O8 respectively, often a mixture)

Angelite

Anhydrite (Calcium Sulfate, CaSO4)

Moss Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide

Tree Agate

SiO2

Quartz

Silicon Dioxide (SiO2)

Riverstone Jasper (Chalcedony)

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Granite Cobble

Granite (Phaneritic Quartz-Feldspar Felsic Rock)

Man-made Green Quartz (Lab-grown or Treated)

Silicon Dioxide (SiO2) with artificial coloration

Moss Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide

Jasper

Jasper (Silicon Dioxide) - SiO2

Basalt (with possible iron oxide staining)

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Eudialyte in Syenite (Dragon Blood Stone)

Na15Ca6(Fe,Mn)3Zr3(Si25O73)(O,OH,H2O)3(Cl,OH)2

Granite

Granite (Felsic Plutonic Rock)

Banded Calcite (often marketed as Mexican Onyx or Onyx Marble)

Calcite (Calcium Carbonate, CaCO3)

Gold

Native Gold (Au)

Chert (Septarian Nodules / Weathered Silex)

Microcrystalline Quartz (SiO2)

Basalt

Basalt (Aphanitic Mafic Volcanic)

Granite

Phaneritic Felsic Igneous Rock

Chert (Flint Nodules)

Silicon Dioxide (SiO2)