Organic Gemstone (Not A Rock Or Mineral)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chert (and Chert-based Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sedimentary

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite, Sodalite, Calcite, and Pyrite)

Mixed Gemstone Bracelet

Mixed natural minerals and rocks (e.g., Rhodonite, Malachite, Sodalite, Rose Quartz, Black Tourmaline, Quartz/Chalcedony variants)

Mineral/Rock assemblage

Banded Agate (specifically Carnelian Agate slice)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Epidosite (Epidote-rich rock)

Epidosite (consisting primarily of Epidote: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Epidote

Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

Prasiolite and Quartz Crystal Cluster

Quartz (SiO2); Prasiolite is a variety of Quartz

Limestone (specifically Bituminous or Carbonaceous Limestone)

Calcium Carbonate (CaCO3) with Organic Impurities

Red Jasper

Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)

Labradorite (Larvikite variety)

Plagioclase Feldspar (Na,Ca)(Al,Si)4O8 with Monzonite/Syenite matrix

igneous

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.

Igneous

Dalmatian Stone (Dalmatian Jasper)

Dalmatian Stone (A variety of Perthite / Aplite)

Igneous

Baroque Pearl

Calcium Carbonate (Aragonite or Calcite) and Conchiolin

Organic Gemstone

Amber (Cherry Amber)

Succinite (C10H16O)

Organic Gemstone

Amber

Succinite (Resinite), C10-H16-O

Chert (Chalcedony)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chert (Iron-rich variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sunstone

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

sedimentary (secondary classification: cryptocrystalline quartz)

Jasper pebble

Silicon dioxide (SiO2) with iron oxide inclusions

Amber

Succinite (fossilized tree resin)

mineraloid

Chert / Flint

Microcrystalline or cryptocrystalline quartz (SiO2)

Amber

Succinite (Fossilized Resin C10H16O)

Organic Mineraloid

Jasper

Jasper (Silicon Dioxide, SiO2)

Chert (specifically Yellow/Brown Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Red Moss Agate (Jasper)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Green Moss Agate

Silicon Dioxide with inclusions (SiO2 + Mn/Fe)

Amber

Amber (Succinite), fossilized tree resin

Mineraloid

Chert (Commonly known as Flint or Jasper when pigmented)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Chalky/Gray Variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Granite

Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)

igneous

Quartz (Float/Abraded)

Quartz (SiO₂)

Quartz (Pebble)

Quartz (SiO₂)

Amber / Copal

Fossilized Tree Resin (Succinate)

Mineraloid

Mica Schist

Mica Schist (primarily Muscovite and Quartz)

Chert (Brown Variety)

Silicon dioxide (SiO2)

Pink Quartzite

Quartzite (SiO2 with minor iron oxide impurities)

Pyrite

Iron Sulfide (FeS2)

Chert (specifically Red Chert/Jasper variety)

Silicon Dioxide (SiO2)