Synthetic Material (Not A Rock Or Mineral)

Sandstone

Arenite (Siliclastic sedimentary rock), SiO2 + various minerals

Chert / Flint

Cryptocrystalline quartz (SiO2)

Quartz (Raw Chunk)

Silicon Dioxide (SiO2)

Iron-stained Quartz

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Bauxite (Pisolitic Bauxite)

Bauxite (mixture of Hydrous Aluminum Oxides)

Greenstone (Epidote/Chlorite Rich Rock)

Metabasalt (often contains Epidote Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))

Lapis Lazuli

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

Limonite with Opal infusion

FeO(OH)·nH2O (Limonite) / SiO2·nH2O (Opal)

Lapis Lazuli (Raw)

Lazurite-rich metamorphic rock; Na3Ca(Al3Si3O12)S

Milky Quartz with Mineral Inclusions

Quartz (Silicon Dioxide, SiO2)

Turquoise in Matrix

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

Gneiss (with Quartzite layers)

Gneissic Metamorphic Rock

Amygdaloidal Basalt with Agate/Chalcedony Infills

Amygdaloidal Basalt (Composition: SiO2 and (Mg,Fe)2SiO4 in matrix; SiO2 in amygdule)

Limestone Breccia

Sedimentary Breccia (Calcareous)

Sandstone

Arenite (primarily SiO2)

Stichtite in Serpentine (Atlantisite)

Mg6Cr2CO3(OH)16·4H2O (Stichtite) within Mg3Si2O5(OH)4 (Serpentine)

Sandstone with Quartz Veining

Clastic sedimentary rock (SiO2 dominated)

Biotite Schist

Biotite Schist

Vesicular Basalt with Amygdaloidal Infill

Basalt (Mafic Extrusive Igneous Rock)

Banded Agate

Cryptocrystalline variety of Quartz (SiO2)

Petrified Wood

Silicified Wood (primarily Quartz / Chalcedony: SiO2)

Ironstone Concretion (Nutstone)

Ironstone (with High Limonite/Hematite Content)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Geode (Unopened)

Silicon Dioxide (SiO2) in sedimentary vugs

Basalt with Calcite Veining

Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Milky Quartz Pebble (Iron-Stained)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Red Jasper

Red Jasper (variety of Chalcedony, SiO₂)

Green Onyx (Banded Calcite)

Travertine (CaCO3 - Calcium Carbonate)

Chert (often called Flint in this context)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Pyrite

Iron Sulfide (FeS2)

Biotite (Black Mica)

Biotite (K(Mg,Fe)3AlSi3O10(OH)2)

Jasper with Quartz inclusions

Silicon Dioxide (SiO2)

Shale

Shale (Sedimentary rock composed of mud/clay minerals)

Lapis Lazuli (Raw Ore)

Na8[Al6Si6O24]n(S,Cl,SO4,OH)2 (Lazurite component)

Clear Quartz Cluster

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble (Water-worn Quartzite)

Silicon Dioxide (SiO2)