Sedimentary (Secondary Mineral) Within Igneous

Amygdaloidal Basalt with Agate/Quartz Infill

Basalt with Secondary Silicate Mineralization (SiO2)

Quartz with Mafic Inclusions

Silicon Dioxide (SiO2) with host igneous matrix

Native Gold

Native Gold (Au)

Pink Granite

Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)

Banded Chalcedony (Agate)

Cryptocrystalline Quartz (SiO2)

Quartz Drusy (on Geode Fragment)

Crystalline Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz (or Vein Quartz)

Silicon Dioxide (SiO2)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Quartz Geode

Quartz (Silicon Dioxide, SiO2)

Amethyst and Hematite Bracelet

Amethyst (SiO2) and Hematite (Fe2O3)

Quartz Geode

Silicon Dioxide (SiO2)

Limonite (Iron Ore)

Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)

Amethyst (Geode Fragment)

Silicon Dioxide with iron impurities (SiO2)

Gneiss

Gneiss

Basalt with Quartz/Calcite Vein

Basalt (Mafic Volcanic Rock with secondary mineralization)

Turquoise

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

Quartz Pebble

Silicon Dioxide (SiO2)

Granitoid (with Epidote and Orthoclase)

Crystalline Felsic Intrusive Rock (containing SiO2, KAlSi3O8, and Ca2(Al2,Fe)(Si2O7)(SiO4)O(OH))

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions

Basalt (with possible quartz/calcite inclusion)

Extrusive mafic igneous rock

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

Dark volcanic rock, likely basalt

Basalt; fine-grained mafic silicate rock dominated by plagioclase and pyroxene, commonly with olivine

Amygdaloidal Basalt

Basalt with secondary mineral infilling (SiO2/CO3)

Amethyst (Quartz)

Silicon Dioxide (SiO2) with iron impurities

Healer's Gold (Pyrite and Magnetite in Schist)

Magnetite (Fe3O4) and Pyrite (FeS2) in Mica Schist

Limonite-stained Quartz

Silicon Dioxide (SiO2) with Iron Oxide/Hydroxide (FeO(OH)·nH2O) staining

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Limestone with Secondary Mineralization

Calcium Carbonate (CaCO3)

River Stones (Quartzite and Sandstone)

Quartzite / Sedimentary Rock (SiO2 dominant)

Brecciated Jasper

Silicon Dioxide (SiO2) with iron impurities

Botryoidal Hematite

Iron(III) oxide (Fe2O3)

Polished basalt with a quartz vein

Basalt, cut by milky quartz (SiO₂)

Rhodochrosite

Manganese carbonate (MnCO3)

Gossanous Sandstone (likely Terrestrial)

Arenite with Iron-Oxide inclusions

Limonite with Hematite

Hydrated iron(III) oxide-hydroxide with variable composition (FeO(OH)·nH2O)

Limonite with Trace Fossils

Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)

Amethyst (Variety of Quartz)

Silicon Dioxide (SiO2)

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)