Mineral, Sediment

Citrine

Silicon Dioxide (SiO2) with iron impurities

Rose Quartz

SiO2 (Silicon Dioxide with trace amounts of titanium, iron, or manganese)

Raw Emerald

Beryl (Be3Al2(SiO3)6) with Cr/V impurities

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Amazonite

Microcline (KAlSi3O8)

Amethyst

Silicon Dioxide with Iron impurities (SiO2)

Labradorite

(Ca, Na)(Al, Si)4O8 (Plagioclase Feldspar)

Rhodonite

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

Chalcedony (Quartz Var.)

Silicon Dioxide (SiO2)

Amethyst

Silicon Dioxide with Iron impurities (SiO2)

Herkimer Diamond

Quartz (Silicon Dioxide, SiO2)

Optical Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Herkimer Diamond

Quartz (Silicon Dioxide, SiO2)

Quartz Geode in Sedimentary Matrix

Silicon Dioxide (SiO2) within a limestone/dolostone host

Yellow Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Leopard Skin Jasper

Chalcedony (cryptocrystalline quartz) with inclusions

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Shale

Lutaceous Sedimentary Rock

Garnet (Almandine)

Almandine Garnet (Fe3Al2(SiO4)3)

Garnet (Almandine/Pyrope variety)

Silicate mineral group; typically Fe3Al2(SiO4)3 (Almandine) or Mg3Al2(SiO4)3 (Pyrope)

Peridot (likely, based on color and appearance)

Olivine group mineral, specifically (Mg,Fe)2SiO4 (Forsterite-Fayalite solid solution series)

Garnet (likely Almandine or Pyrope)

Garnet Group (e.g., Almandine: Fe3Al2(SiO4)3; Pyrope: Mg3Al2(SiO4)3)

Sugilite

Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)

Asphalt (Bituminous pavement fragment)

Artificial conglomerate / Bitumen-Aggregate mixture

Quartz (Milky/Smoky variety on matrix)

Silicon Dioxide (SiO2)

Pink Granite

Phaneritic intrusive igneous rock (Felsic)

Coarse-grained Quartz with Feldspar inclusions

Crystalline Quartz (SiO2) with Orthoclase/Plagioclase Feldspar inclusions

Foliated Gneiss (River-Worn Pebble)

Gneiss (High-grade Regional Metamorphic Rock)

Basalt with Plagioclase Phenocrysts

Porphyritic Basalt

Basalt with Quartz/Calcite Inclusions

Mafic Volcanic Rock (Fe-Mg silicate rich)

Quartzite (Yellow/Iron-stained Quartz)

Quartzite (primarily SiO2 with iron oxide impurities)

Granite with Orthoclase and Hematite Staining

Phaneritic Felsic Igneous Rock (primarily SiO2 with KAlSi3O8)

Granite

Phaneritic Plutonic Felsic Rock

Pink Granite

Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)

Gneiss (Metamorphic Rock)

Gneiss

Quartzite Pebble (with Iron Inclusions)

Quartzite (primarily SiO2 with Fe2O3/FeOOH impurities)

Basalt with Epidote Veins

Mafic Igneous Rock (Basalt)

Geode (unopened)

Chert / Chalcedony Geode (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Diamond (Uncut Crystal)

Carbon (C)