Mixed (Predominantly Sedimentary And Igneous)

Red Jasper (in Quartz/Chalcedony)

Silicon Dioxide (SiO2) with iron oxide inclusions

Banded Sandstone / Quartzite with Mineral Veins

Sedimentary rock (Quartz arenite with iron oxide/silica banding)

Sandstone (Pebble)

Sandstone

Black obsidian (probable)

Volcanic glass; predominantly SiO₂

Obsidian Arrowhead

Volcanic Glass (predominantly SiO2)

Obsidian

Volcanic Glass (predominantly SiO2)

Obsidian

Volcanic Glass (predominantly SiO2)

Obsidian (specifically Rainbow or Silver Sheen Obsidian)

Volcanic Glass (predominantly SiO2)

Black Obsidian

Volcanic Glass (predominantly SiO2)

Obsidian

Volcanic Glass (predominantly SiO2)

Sandstone (Weathered Pebble)

Sedimentary Rock (Quartz arenite)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Red Sandstone Pebble

Sedimentary Quartz Arenite / Arkose

Sandstone

Clastic sedimentary rock (Quartz arenite)

Sandstone

Clastic sedimentary rock (Quartz arenite or Arkose)

Tumbled hematite (likely hematite-rich iron oxide)

Hematite, Fe₂O₃; possibly mixed with magnetite, Fe₃O₄

Polished red jasper with quartz/chalcedony

Jasper (microcrystalline quartz, SiO₂), locally mixed with chalcedony or quartz

Likely granite or granitic gneiss

Coarse-grained quartz–feldspar–mica rock; possibly biotite granite or banded granitic gneiss

Mixed rock fragments, likely granite and weathered metamorphic rock

Granite (quartz–feldspar–mica aggregate) with probable schist/gneiss fragments

Rose Quartz

Silicon Dioxide (SiO2) with microscopic fibrous inclusions

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Amethyst variety)

Silicon Dioxide (SiO2)

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Conglomeratic sandstone or breccia

Lithic arkose / polymictic conglomeratic sandstone

Carnelian

Chalcedony (SiO2) with Iron Oxide impurities

Sandstone

Clastic sedimentary rock

Weathered limestone fragment

Limestone, predominantly calcite (CaCO₃)

Amethyst (Chevron or Banded Amethyst)

Silicon Dioxide (SiO2) with trace Iron (Fe)

Fossiliferous limestone

Bioclastic limestone, predominantly calcite (CaCO₃)

Boji Stone (Pop Rocks or Moqui Marbles)

Iron-manganese oxide concretion (Goethite/Hematite/Jarosite)

Metallic sulfide mineral specimen, likely pyrite

Pyrite (FeS₂), possibly a pyrite-rich sulfide aggregate

Azurite and Malachite

Cu3(CO3)2(OH)2 (Azurite) / Cu2CO3(OH)2 (Malachite)

Chrysocolla in Matrix

Chrysocolla (Cu,Al)2H2Si2O5(OH)4·nH2O

Sandstone Pebble

Sedimentary Rock (Quartz Arenite)

Sandstone

Arenite (predominantly SiO2 with iron oxides)

Granite

Intrusive Igneous Rock

Amethyst

Silicon Dioxide with iron impurities (SiO2)

Snowflake Obsidian

Obsidian with Cristobalite inclusions (Amorphous SiO2 + SiO2 inclusions)

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Peach Moonstone

Potassium Aluminum Silicate, KAlSi3O8

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Red Jasper (possibly Red Coral or dyed Howlite)

Silicon Dioxide (SiO2) with Iron Oxide inclusions