This Appears To Be A Man Made Metallic Object, Likely Jewelry, Not A Natural Rock, Mineral, Or Geological Specimen.

Quartz / Vein Quartz

Quartz (Silicon Dioxide, SiO2)

Cloud Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz (Tumbled)

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Peridot (Olivine)

Olivine ((Mg,Fe)2SiO4)

Obsidian

Obsidian (Volcanic Glass)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Diorite (possibly fine-grained variety or a related intermediate intrusive rock like a felsic gabbro or a dark granodiorite)

Diorite (Igneous rock, intrusive, intermediate composition)

Diamond

Diamond (pure carbon; C)

Granite

Granite (Felsic intrusive igneous rock)

Lapis Lazuli

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Chert (Brown variety / Common Jasper)

Microcrystalline Quartz (SiO2)

Chalcedony

Chalcedony (SiO₂)

Diamond

Diamond (C)

Amethyst Quartz (Amethyst Geode)

Silicon Dioxide (SiO2) with iron impurities

Diamond (in a gold ring)

Diamond (pure carbon, C)

Almandine Garnet

Iron aluminum silicate (Fe3Al2(SiO4)3)

Moonstone

Orthoclase Feldspar (KAlSi3O8)

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Obsidian

Obsidian (Volcanic Glass; SiO2 content > 70%)

Peridot and Citrine Gemstones (in a ring setting)

Peridot (Olivine: (Mg,Fe)2SiO4), Citrine (Quartz: SiO2)

Druzy Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (pronounced 'nice')

Crazy Lace Agate

Agate (Cryptocrystalline Quartz), Silicon Dioxide (SiO2)

Red Jasper

Jasper (Silicon Dioxide with iron oxide inclusions), SiO2

Ruby

Corundum (Al2O3 with Chromium traces)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide - SiO2)

Chrome Diopside

Magnesium Calcium Silicate (MgCaSi2O6) containing Chromium impurities

Dalmatian Stone

Dalmatian Jasper / Feldspathic Igneous Rock

Jasper

Jasper / Silicon Dioxide (SiO₂)

Fulonite (Fulgurite-like)

Fulgurite (SiO2 fused silica/lechatelierite)

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite or Iron Oxide inclusions

Rose Quartz

Quartz (SiO2) with trace impurities causing pink color

Red Jasper

Opaque microcrystalline Quartz (SiO2 with Fe2O3 inclusions)

Mahogany Obsidian

Obsidian (Volcanic Glass) with Hematite/Magnetite inclusions