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

Pyrite

Pyrite (Iron sulfide, FeS₂)

Quartz (specifically Clear Quartz or Rock Crystal)

Silicon Dioxide (SiO2)

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Petrified Wood

Silicified wood (Quartz/Chalcedony/Opal)

Charoite

Charoite (Hydrated potassium sodium calcium barium strontium silicate hydroxyfluoride)

Dragon Blood Jasper (Epidote with Piedmontite or Quartz)

Epidote-rich Quartzite / SiO2 with (Ca2(Al2,Fe)(Si2O7)(SiO4)O(OH))

Obsidian

Obsidian (Volcanic Glass)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Rhodonite

Rhodonite (MnSiO3)

Quartz (Milky/Clear Quartz)

Silicon Dioxide (SiO2)

Dalmatian Jasper

Peralkaline rhyolite

Chevron Amethyst

Quartz (SiO2) with patterned Amethyst and White Quartz/Milky Quartz

Moonstone

Adularia (orthoclase) or Albite (plagioclase), a feldspar mineral (KAlSi3O8 or NaAlSi3O8 respectively, often a mixture)

Sapphire (Corundum)

Corundum (Al2O3), variety Sapphire

Banded Iron Formation (BIF)

Banded Iron Formation (composed primarily of Hematite [Fe2O3], Magnetite [Fe3O4], and Chert [SiO2])

Quartz (Milky or White Quartz)

Silicon Dioxide (SiO2)

Quartz / Chert

Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Moss Agate

Chalcedony (Silicon Dioxide, SiO2) with inclusions

Epidote

Epidote (formula: Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Flower Agate

Chalcedony (cryptocrystalline Quartz) with Spherulite inclusions; SiO2

Quartz (Rose or Milky)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal

Jade

There are two distinct minerals commonly known as Jade: Nephrite (a calcium magnesium silicate - Ca2(Mg,Fe)5Si8O22(OH)2) and Jadeite (a sodium aluminum silicate - NaAlSi2O6). Based on the image showing a typically softer, more fibrous appearance, it is likely Nephrite.

Pyrite

Pyrite (Iron Disulfide), FeS2

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Red Sandstone

Arenite (primarily composed of SiO2 with Fe2O3 cement)

Clear Quartz (Druzy/Crystal Cluster)

Silicon Dioxide (SiO2)

Banded Sandstone (Zebra Stone)

Arenite with Iron Oxide Banding (Liesegang rings)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Mixed Gemstone Bracelet

Mixed natural minerals and rocks (e.g., Rhodonite, Malachite, Sodalite, Rose Quartz, Black Tourmaline, Quartz/Chalcedony variants)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Caliche (also known as hardpan, calcrete, kankar)

Primarily composed of calcium carbonate (CaCO₃), often mixed with other minerals like quartz, clay minerals, and iron oxides.

Banded Iron Formation (BIF)

Banded Iron Formation

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide)

Moldavite

Moldavite (Siliceous vitreous substance)

Schist

Schist (various mineral compositions)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)