Mineral With Metamorphic Or Igneous Host

Labradorite

Labradorite (a variety of Plagioclase Feldspar), Na(AlSi3O8) to Ca(Al2Si2O8)

Quartzite with Quartz Geode / Vug

Crystalline Silicon Dioxide (SiO2) in Metamorphic Host

Pegmatite

Igneous Pegmatite (Quartz-Feldspar-Biotite)

Garnet

Almandine (Fe3Al2(SiO4)3)

Green aventurine quartz (likely)

Quartz, SiO₂, colored mainly by fuchsite mica or chlorite inclusions

Green Aventurine

Quartz (Silicon Dioxide, SiO2) with fuchsite inclusions

Garnet (Red Garnet)

Garnet Group. The red varieties seen in jewelry are typically Almandine (Fe3Al2(SiO4)3), Pyrope (Mg3Al2(SiO4)3), or a mix of the two (pyrope-almandine series).

Polished rhodonite

Rhodonite, (Mn,Fe,Mg,Ca)SiO₃

Metallic sulfide mineral specimen, likely pyrite

Pyrite (FeS₂), possibly a pyrite-rich sulfide aggregate

Quartz with Schist Inclusion

Crystalline Silicon Dioxide (SiO2) with Muscovite/Biotite Schist

Small white mineral fragment

Likely quartz (SiO₂), possibly calcite (CaCO₃)

Magnetite

Magnetite (Fe3O4)

Vein-bearing metamorphic rock, likely gneiss or schist

Banded silicate rock; likely quartz–feldspar–mica gneiss with a quartz vein

Banded River Cobble with Mafic Dike

Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion

Quartz Vein in Siltstone

Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix

Wishing Stone (Quartz-Veined Basalt)

Amygdaloidal Basalt with Quartz (SiO2) vein

Smoky Quartz in Matrix

Silicon dioxide (SiO2) within Pegmatite/Gneiss

Quartz-bearing Pegmatite with Metallic Sulfides

Pegmatite / Quartz-Feldspar Matrix with Pyrite and Mica

Milky Quartz with Schist Matrix

Silicon Dioxide (SiO2) with Mica Schist Matrix

Copper Ore

Cupriferous Rock / Mixed Mineral Matrix

Basalt-Amugydule (Amygdaloidal Basalt)

Aphanitic Mafic Igneous Rock with Vesicle Infillings

Emerald in Matrix

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Quartz

Silicon dioxide (SiO2)

Smoky Quartz on Feldspar (Granite Pegmatite)

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)

Quartz with Mica Schist Matrix

Quartz (SiO2) in Mica Schist Matrix

Green Moss Agate

Agate (Silicon Dioxide - SiO2 with inclusions of Manganese/Iron oxides)

White Topaz

Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Quartz in Basalt (Xenocryst)

Silicon Dioxide (SiO2) in Mafic Igneous Volcanic Rock

Dendritic Agate

Chalcedony (Silicon Dioxide) with Manganese or Iron Oxide inclusions

Agate (Plume/Moss variety)

Cryptocrystalline Quartz (SiO2) with iron/manganese inclusions

Almandine Garnet in Matrix

Almandine (Fe3Al2(SiO4)3)

Small quartz-rich rock fragment (possibly weathered quartz vein material)

Quartz (SiO₂) in an undetermined host rock; the image is insufficient to identify the host confidently

Pyrite-bearing rock, likely pyrite schist or phyllite

Quartz–mica-rich metamorphic rock with disseminated pyrite (FeS₂); exact rock type cannot be confirmed from the image

Quartz Vein in Sedimentary Matrix

Silicon Dioxide (SiO2) with host rock

Tumbled K2 stone (granite with blue azurite)

K2 granite, chiefly quartz–alkali feldspar–biotite with azurite inclusions

Pyrite-bearing rock

Likely pyrite (FeS₂), possibly with quartz or other sulfide minerals

Milky Quartz Pebble with Matrix

Quartz (SiO2)

Black Tourmaline

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Quartz Vein in Host Rock (Likely Slate or Shale)

Hydrothermal Quartz (SiO2) in Pelitic host rock

Quartz

Quartz (SiO2 - Silicon Dioxide)

Pegmatite

Igneous Pegmatite (Granitic Composition)