Sedimentary (Secondary Mineral) Within Igneous

Amygdaloidal Basalt

Amygdaloidal Basalt

Amethyst

Quartz (Silicon Dioxide with Iron impurities), SiO2

Banded Rhyolite (likely Green Jasper/Agate variety)

Silicon Dioxide (SiO2) with mineral inclusions

Amygdaloidal Basalt with Epidote

Vesicular Basalt with secondary Epidote/Quartz mineral infill

Basalt with Quartz/Calcite Veins

Basalt (Aphanitic Mafic Volcanic Rock) with Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) inclusions

Chalcedony (Yellow/Honey variety)

Microcrystalline Quartz (SiO2)

Aragonite Star Cluster

Aragonite (Calcium Carbonate - CaCO3)

Limonite (Iron Stone/Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

Banded River Cobble with Mafic Dike

Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion

Agate

Silicon Dioxide (SiO2) - variety Chalcedony

K2 Jasper (Beads)

Granodiorite with Azurite and Malachite

Sapphire (Corundum)

Corundum (Al2O3)

Basalt (Vesicular)

Basalt (Mafic Extrusive Igneous Rock)

Agate

Silicon Dioxide (SiO2)

Diamond

Carbon (C)

Gold Nugget

Native Gold (Au)

Basalt with Amygdules

Amygdaloidal Basalt

Labradorite (a variety of Feldspar)

Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)

Ruby (Corundum)

Al2O3 (Aluminium oxide with Chromium impurities)

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide)

Gneiss

Gneiss (high-grade metamorphic rock typically composed of quartz, feldspar, and mica)

Basalt with Quartz Veining

Amygdaloidal Basalt (predominately SiO2 and (Na,Ca)(Si,Al)4O8)

Basalt with Quartz Vein

Basalt (SiO2 vein inclusion)

Yellow Jasper

Chalcedony (Silicon Dioxide with Iron inclusions), SiO2

Limonite (Ironstone Concretion)

Limonite (Hydrous ferric oxide mixture, FeO(OH)·nH2O)

Boxwork Siderite or Sepatarian Nodule Weathering

Siderite (FeCO3) with secondary mineralization or Boxwork Geode fragment

Limonite (Iron Ore)

Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O)

Smoky Quartz

Smoky Quartz (SiO2)

Greenstone / Diabase Porphyry

Porphyritic Diabase (Micro-gabbro)

Granite Gneiss

High-grade regional metamorphic rock (Quartz-Feldspar Gneiss)

Quartz Pebble (Iron-Stained)

Silicon Dioxide (SiO2)

Limonite (Iron Ore)

Limonite (Hydrous ferric oxides), generic formula FeO(OH)·nH2O

Basalt with Quartz/Calcite Veins

Amygdaloidal Basalt (SiO2 or CaCO3 inclusions)

Druzy Quartz (on Geode Fragment)

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss (Metamorphic Rock)

Gneiss

Sandstone (Quartzite texture)

Arenite (SiO2 secondary)

Garnet-Bearing Gneiss

Almandine-Garnet Gneiss

Sandstone with Liesegang Rings

Arenite with Iron Oxide Concretions

Sandstone (River Rock)

Arenite (composed primarily of SiO2)

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Milky Quartz (Crystal Cluster)

Silicon Dioxide (SiO2) - Quartz Variety