Anthropogenic (Man Made Product Subject To Geological Processes)

Quartz (Milky/Sugar variety)

Silicon Dioxide (SiO2)

Diamond

Carbon (C)

Rhodonite, Gray Moonstone, and White Feldspar Mix

Multiple: MnSiO3 (Rhodonite), (K,Na)AlSi3O8 (Feldspar/Moonstone)

Quartz Geode Fragment with Iron Staining

Silicon Dioxide (SiO2)

Calcite

Calcium Carbonate (CaCO3)

Granodiorite with Quartz Veining

Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Red Jasper

Jasper (a variety of Chalcedony, SiO₂ with iron oxide inclusions)

Limestone (Karst formation)

Calcium Carbonate (CaCO3)

Psilomelane (Black Hematite varietal)

Barium Manganese Oxide (Ba,H2O)2Mn5O10

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Ferruginous Quartz

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Quartzite

Metamorphic Quartz Sandstone

Calcite

Calcium Carbonate (CaCO3)

Mica schist (possibly garnet–mica schist)

Muscovite–biotite schist; chiefly quartz, feldspar, muscovite, and biotite

Bauxite

Aluminium ore (Hydrated aluminium oxides AlOx(OH)3-2x)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartzite on Matrix

Crystalline Silicon Dioxide (SiO2) within metamorphic matrix

African Turquoise (Jasper)

Polychrome African Jasper (often marketed as 'African Turquoise' due to its color, but it is not true turquoise)

Citrine Quartz

Silicon Dioxide (SiO2)

Quartzite pebble

Quartzite (SiO2 silicon dioxide)

Milky Quartz

Silicon Dioxide (SiO2)

Chert with Limestone

Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) Matrix

Quartzite

Quartzite (SiO2)

Bauxite

Bauxite (Al(OH)3, AlO(OH))

Green Fluorite

Calcium fluoride (CaF2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Vein / Milky Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Pyrite (FeS₂)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Pale granite pebble (tentative identification)

Granite; a coarse-grained felsic intrusive igneous rock composed primarily of quartz and feldspar, with minor mica or amphibole

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (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.

Rhodonite

Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3

Limestone (Micrite/Chalky variety)

Calcium Carbonate (CaCO3)

Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Peridotite (with Olivine)

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

Fossil Coral

Coral Limestone (a type of biogenic sedimentary rock)

Pyrite

Iron Sulfide (FeS2)

Limestone

Calcium Carbonate (CaCO3)