Sedimentary (Secondary Mineral) Within Igneous

Yellow Agate

Silicon Dioxide (SiO2)

Ferruginous Quartz

Iron-stained Quartz (Silicon Dioxide, SiO2 with Fe2O3 inclusions)

Magnetite (potentially as a Lodestone or within Ironstone)

Magnetite (Fe3O4)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Gold Ore

Native Gold (Au)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Druzy Agate (Star-cut Geode Slice)

Silicon Dioxide (SiO2) - Microcrystalline and Macrocrystalline Quartz

Gold Nugget

Native Gold (Au)

Pink Granite

Phaneritic Plutonic Igneous Rock (high K-feldspar content)

Olivine (Peridotite)

(Mg,Fe)2SiO4 (Magnesium Iron Silicate)

Apache Tear

Obsidian (Volcanic Glass), formula: 70–75% SiO2 plus MgO, Fe3O4

Peridotite (with Olivine)

Peridotite (rich in Olivine, (Mg,Fe)2SiO4)

Gold Nugget

Native Gold (Au)

Diamond

Diamond (C)

Granite (Dioritic variant)

Granite (Phaneritic Igneous Rock)

Hematite

Hematite (Fe2O3)

Boxwork Quartz / Septarian Jasper

Boxwork (SiO2 with iron oxide inclusions)

Shale (possibly)

Shale (fine-grained clastic sedimentary rock)

Black Obsidian

Volcanic Glass (Amorphous Silicon Dioxide, SiO2)

Chert (Chert / Flint nodule)

Silicon Dioxide (SiO2)

Crazy Lace Agate

Silicon dioxide (SiO2) - a variety of banded Chalcedony (cryptocrystalline quartz)

River/Stream Pebble

Clast / Detrital Grain / Rounded Sedimentary Particle (Compositionally variable, commonly Quartz, Feldspar, Chert, or other resistant rock fragments)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Slate

Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.

Arid Sandy Loam

Arenosols / Regosols

Blue Aventurine

Quartzite with inclusions of Dumortierite (SiO2 + Al7(BO3)(SiO4)3O3)

Basalt

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Granite (Alkali-feldspar Granite)

Granite (composed primarily of Quartz, K-Feldspar, and Plagioclase)

Granitoid (Granitic Rock)

Granitoid (Quartzo-feldspathic plutonic rock)

Graphic Granite

Pegmatitic Quartz-Feldspar Granite

Diorite

Diorite (Intermediate intrusive igneous rock)

Schist (specifically Chlorite/Greenschist)

Chlorite Schist

Gneiss (specifically a Banded Gneiss cobble)

Gneiss (composed mainly of Quartz, Feldspar, and Biotite/Amphibole)

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Chert (Yellow Chert/Flint)

Silicon Dioxide (SiO2)

Red Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Jasper (Chocolate or Brown Jasper)

Silicon Dioxide (SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Jasper

Silicon dioxide (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions