Mineral (Native Element Alloy)

Milky Quartz

Silicon Dioxide (SiO2)

Granite

Plutonic Igneous Rock

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Obsidian

Volcanic Glass (predominantly SiO2)

Quartz Druzy

Silicon Dioxide (SiO2)

Dyed Crackle Quartz

Silicon Dioxide (SiO2) with synthetic dye

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Azurite in Matrix

Azurite (Cu3(CO3)2(OH)2) in Rhyolite or Sandstone matrix

Amygdaloidal Basalt

Amygdaloidal Basalt with Secondary Infilling (e.g., Agate, Quartz, or Zeolite)

Copper Ore (Chrysocolla/Malachite in host rock)

Hydrated copper phyllosilicate and copper carbonate hydroxide

Fluorite (Green Fluorite)

Fluorite (Calcium Fluoride, CaF2)

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Rounded granite cobble

Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende

Milky quartz (rough quartz fragment)

Quartz, silicon dioxide (SiO₂)

Milky quartz with iron-oxide staining

Quartz (silicon dioxide, SiO₂), commonly intergrown massive quartz

Tumbled and polished quartz crystal points

Quartz (silicon dioxide, SiO₂), chiefly rock crystal with smoky or included varieties

Clear quartz crystal point

Quartz (silicon dioxide, SiO₂), likely a polished or cut crystal

Weathered river stones, likely basaltic andesite and related volcanic rocks

Fine-grained mafic/intermediate volcanic rocks; commonly basalt (plagioclase + pyroxene ± olivine) or andesite (plagioclase + pyroxene ± amphibole)

Lapis Lazuli (Low-grade)

Lapis Lazuli (Aggregate of Lazurite, Calcite, and Pyrite)

Quartz Pebble

Silicon Dioxide (SiO2)

Unakite Epidote-Granite

Unakite (Epidotized Granite)

Quartz Pebble

Silicon Dioxide (SiO2)

Bauxite

Bauxite (Al2O3·2H2O)

Orthoclase Feldspar

Potassium Feldspar (KAlSi3O8)

Quartz Pebble

Silicon Dioxide (SiO2)

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Greenstone / Epidosite

Epidosite (Metasomatic rock consisting mainly of Epidite Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH) and Quartz)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Lapis Lazuli

Lapis Lazuli (Complex aggregate mainly of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite

Hydrothermal Quartz or Quartzite (SiO2)

Lapis Lazuli

Na8[Al6Si6O24]S2 (Lazurite component), a rock composed primarily of Lazurite, Calcite, and Pyrite

Quartz with Mafic Inclusions

Silicon Dioxide (SiO2) with host igneous matrix

Demitasse Granite (Diorite-Granite transition)

Intermediate Plutonic Rock (Granodiorite/Diorite mix)

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Lapis Lazuli

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Quartz (Yellow/Tan Quartzite Pebble)

Silicon Dioxide (SiO2)

Lapis Lazuli

Sodalite-rich metamorphic rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Quartz (Milky/Crystal variety)

Silicon Dioxide (SiO2)

Greenstone

Metabasalt (composed mainly of chlorite, epidote, and actinolite)

Lapis Lazuli

Lapis Lazuli (A complex rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Aquamarine

Beryl (Be3Al2Si6O18) with trace Iron (Fe2+)