Man Made Silicate (Anthropogenic Glass)

Olivine (Peridotite)

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

Rhodonite

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

Rhodonite

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

Fossilized Shell in Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Crystal Quartz Beads (likely Clear Quartz)

Quartz (SiO₂)

Schorl (Black Tourmaline) in Quartz and Feldspar

NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)

Diamond in Kimberlite

Diamond in Kimberlite Matrix (Diamond: C, Kimberlite: complex Potassic Peridotite)

Diamond (in a jewelry setting)

Cubic Carbon (C)

Granite

Granite (Felsic intrusive igneous rock)

Rhodonite

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

Rhodonite

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

Eclogite garnet in matrix

Eclogite (Garnet-Omphacite rock)

Orthoclase Feldspar (or K-Feldspar)

Orthoclase (KAlSi3O8)

Fossilized Coral (Coquina/Limestone)

Cnidaria Anthozoa (Fossilized)

Basalt

Basalt (Mafic volcanic rock)

Rhodonite

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

Rhodonite

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

Olivine

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

Rhodonite

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

Olivine (Peridotite)

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

Pearl

Calcium Carbonate (CaCO3) with Conchiolin

Sapphire (likely blue synthetic sapphire or blue glass in a ring)

Corundum (Al₂O₃), specifically the blue variety due to trace amounts of iron and titanium impurities. If synthetic, it would still be Al₂O₃.

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Rhodonite

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

Rhodonite

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

Amethyst Geode

Silicon Dioxide (SiO2) with trace Iron (Fe3+) impurities

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide impurities, SiO2 + Fe2O3)

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions

Quartzite

Quartzite (primarily SiO2)

Quartz (Crystal/Druzy Quartz)

Quartz (SiO₂)

Quartz (likely a clear or rock crystal variety)

Quartz (SiO2 - Silicon Dioxide)

Quartz (likely milky/gray variety)

Quartz (SiO₂)

Rhodonite

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

Rhodonite

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

Rhodonite

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

Rhodonite

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

Jasper (Mookaite style)

Jasper (Silica-rich Microcrystalline Quartz, SiO2)

Kaolinite (Chalky Clay)

Kaolinite (Al2Si2O5(OH)4)

Red Garnet

Almandine and Pyrope (Silicate minerals: Fe3Al2(SiO4)3 and Mg3Al2(SiO4)3)

Ruby in Zoisite (Anyolite)

Anyolite (Combination of Corundum and Zoisite)

Bauxite

Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))

Schist

N/A (a rock type, not a mineral formula)