Mineral And Organic Gemstone

Petrified Wood

Silicified Wood (SiO2)

Septarian Nodule (Micro-fragment)

Septarian Nodule / Concretion (CaCO3 + CaMg(CO3)2 + Quartz)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Quartz (Milky/Iron-stained)

Silicon Dioxide (SiO2)

Jasper (specifically Polychrome or Desert Jasper)

Silicon Dioxide with impurities (SiO2)

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Chrysocolla in Matrix

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)

Epidote and Quartz in Basalt

Epidote [Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)] in Metabasalt

K2 Jasper (K2 Granite)

Azurite in Granite (Biotite Granite containing Azurite)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Epidote with Quartz

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

Quartz Geode

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Quartz Geode (Nodule)

Silicon Dioxide (SiO2)

Black Onyx

Cryptocrystalline Quartz (SiO2 with organic/iron impurities)

Blue Agate (Tumbled and Dyed)

Silicon Dioxide (SiO2) with likely organic dyes

Milky Quartz with Iron Inclusions

Crystalline Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Mixed Gemstone Beaded Jewelry

Various minerals (e.g., Quartz varieties like Rose Quartz, Amethyst; Peridot; Garnet; etc.)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz with Inclusions

Quartz (Silicon Dioxide, SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Epidote

Calcium aluminum iron silicate hydroxide (Ca2(Al,Fe)3(SiO4)3(OH))

Pearl (Imitation or Cultured)

Calcium Carbonate (Aragonite/Calcite) - CaCO3

Chert (Arrowhead Fragment)

Microcrystalline Quartz (SiO2)

Chert (Flint nodule)

Silicon dioxide (SiO2)

Garnet

Almandine (Fe3Al2(SiO4)3)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Liesegang Ring Siltstone

Siltstone with iron oxide Liesegang bands

Fluorite (specifically Blue John or Banded Fluorite)

Calcium Fluoride (CaF2)

Howlite

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

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Chert (Green Chert or Jasper)

Microcrystalline Quartz (SiO2)

Talc

Talc (Mg₃Si₄O₁₀(OH)₂)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Shale or Siltstone

Sedimentary Clastic Rock (Variable mineral composition including quartz and clay minerals)

Arsenopyrite in Quartz Matrix

Arsenopyrite (FeAsS) with Quartz (SiO2)