Igneous And Metamorphic

Milky Quartz with Iron Inclusions

Quartz (Silicon Dioxide, SiO2)

Quartz with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions

Milky quartz (rough quartz fragment)

Quartz, silicon dioxide (SiO₂)

Citrine Quartz Crystal Cluster

Silicon Dioxide (SiO2) with iron impurities

Amethyst (Chevron or Banded Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Smoky Quartz (Vein Quartz)

Quartz (Silicon Dioxide, SiO2)

White quartz in dark matrix (likely quartz-bearing breccia or polished composite specimen)

Quartz, SiO₂, in an unidentified dark silicate matrix

Likely hematite-rich ironstone or metallic mineral fragment

Hematite (Fe₂O₃), possibly with magnetite (Fe₃O₄) or metallic iron

Milky quartz with iron-oxide staining

Quartz (SiO₂), likely ferruginous milky quartz

Milky quartz (likely vein quartz)

Quartz, silicon dioxide (SiO₂)

Quartz Pebble

Silicon Dioxide (SiO2)

Citrine

Citrine (Silicon Dioxide - SiO2)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Likely quartz-rich mineral fragment

Quartz (SiO₂), possibly iron-stained or included quartz

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Labradorite (a variety of Feldspar)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(OH)2

Sodalite

Sodalite (Na4Al3Si3O12Cl)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Citrine Quartz Cluster

Silicon Dioxide (SiO2)

Green Quartz (Prasiolite)

Crystalline Silicon Dioxide (SiO2)

Amethyst

Quartz (Silicon Dioxide, SiO2) with iron impurities

Smoky Quartz

Silicon Dioxide (SiO2)

Quartz River Pebbles

Silicon Dioxide (SiO2)

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Quartz

Silicon dioxide (SiO2)

Calcite (Yellow/Orange variety - sometimes called Honey Calcite)

Calcite

Quartz pebble

Silicon dioxide (SiO2)

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Orange Quartz with Hematite inclusions

Quartz (SiO2) with Hematite (Fe2O3) inclusions

Yellow Quartz (Citrine-colored Quartz)

Silicon Dioxide (SiO2)

Moonstone

Orthoclase Feldspar (KAlSi3O8)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Jasper, Agate, Quartz Mix (Polished Beads)

SiO₂ (Silicon Dioxide) for Quartz. Jasper and Agate are cryptocrystalline varieties of Quartz.

Biotite Mica

Biotite, K(Mg,Fe)3AlSi3O10(F,OH)2

Green Tourmaline (Verdelite)

Tourmaline Group; often Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4) or Dravite (NaMg3Al6(BO3)3Si6O18(OH)4)

Rose Quartz

Rose Quartz (SiO2)

Amethyst (Geode Fragment)

Silicon Dioxide (SiO2 with iron impurities)