Mineral (Specifically A Variety Of Quartz)

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Limestone (specifically Dolomitic/Crystalline Limestone)

Sedimentary Carbonate Rock (CaCO3 / CaMg(CO3)2)

Blue Chalcedony

Silicon Dioxide (SiO2)

Chert (often called Flint when dark)

Sedimentary cryptocrystalline quartz (SiO2)

Chert (Field Stone/Jasper variety)

Microcrystalline Quartz (SiO2)

Jasper

Jasper (Cryptocrystalline Quartz, SiO2)

Chert (Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Marble

Metamorphosed Limestone/Dolomite

Sandstone

Arenite (composed primarily of SiO2)

Sapphire (likely blue synthetic sapphire or blue glass in a ring)

Corundum (Al₂O₃), specifically the blue variety due to trace amounts of iron and titanium impurities. If synthetic, it would still be Al₂O₃.

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

Quartzite

Quartzite (SiO2)

Red Jasper

Silicon dioxide (microcrystalline quartz with iron oxide inclusions), SiO2

Green Jasper with Quartz veins

Jasper (Silicon Dioxide, SiO2)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Dalmatian Stone (Dalmatian Jasper)

Dalmatian Stone (A variety of Perthite / Aplite)

Chert (varieties include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Jasper (Red Jasper)

Silicon Dioxide (SiO2) with iron oxide inclusions

Iron-stained Milky Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Diabase

Diabase (also known as Dolerite)

Porphyritic Andesite

Andesite (Porphyry)

Apache Tears (Obsidian)

Volcanic Glass (SiO2 - Silicon Dioxide with impurities)

Green Aventurine

Aventurine (Silicon dioxide, SiO₂)

Included Quartz Beads (likely Phantom Quartz or Garden Quartz)

Quartz (SiO2) with various mineral inclusions

Quartzite

Quartzite (primarily SiO2)

Banded Calcite (often commercially called 'Mexican Onyx')

Calcium Carbonate (CaCO3)

Amazonite (likely mixed with other feldspars/minerals)

Amazonite is a variety of Microcline, which is a tectosilicate mineral, formula KAISi3O8. The mixed beads could include other feldspars or quartz.

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (Quartz Sandstone)

Arenite (primarily SiO2)

Pyrite on Quartz matrix

Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)

Pink Quartzite (Water-worn)

Quartzite (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Granite

Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Yellow Jasper (Beach Pebble)

Silicon Dioxide (SiO2) with iron hydroxide impurities

Chert (varietal: Jasper or Ironstone nodule)

Microcrystalline Quartz (SiO2) with iron oxides

Jasper (Red Jasper)

Silicon Dioxide (SiO₂)

Chert (Flint/Jasper variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Aquamarine

Beryl (Be3Al2Si6O18)

Red Jasper

Jasper (Silicon Dioxide, SiO2 with iron oxide impurities)

Milky Quartz

Silicon Dioxide (SiO2)