Mineral With Metamorphic Or Igneous Host

Quartz with Mica

Silicon Dioxide (SiO2) with Mica group inclusions

Hypersthene (or Enstatite/Ferrosilite)

Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)

Quartz Vein in Host Rock

Quartz (SiO2) in Mafic or Sedimentary Matrix

Quartz pebble

Silicon Dioxide (SiO2)

Ruby / Pink Sapphire

Corundum (Al2O3 with Chromium impurities)

Quartz-rich pegmatite (likely feldspar–quartz rock)

Granitic pegmatite; predominantly quartz (SiO₂) and feldspar, with possible mica and iron-oxide staining

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite (on host rock)

Iron Sulfide (FeS2)

Banded Chalcedony (Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Quartz-rich rock or quartz specimen

Quartz (SiO₂), likely massive quartz or quartz-bearing host rock

Metal-rich sulfide ore, likely galena-bearing rock

Galena (PbS) with pyrite/chalcopyrite in a host rock; exact identification requires testing

Pegmatite

Igneous Pegmatite

Black Sapphire (Basaltic Blue Sapphire)

Corundum (Al2O3)

Small polished or naturally worn stone, possibly quartz-bearing rock

Indeterminate from the blurred image; likely quartz (SiO₂) or a pale feldspar-rich fragment

Milky Quartz

Silicon Dioxide (SiO2)

Blue Apatite

Apatite group (Ca5(PO4)3(F,Cl,OH))

Blue Sapphire (Tumbled/Polished)

Corundum (Al2O3)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Quartz Vein in Schist

Quartz-rich Micaceous Schist (SiO2 + phyllosilicates)

Epidote

Epidote (Ca2(Al, Fe)3(SiO4)3(OH))

Milky quartz-rich vein rock

Quartz, SiO₂, likely massive or microcrystalline quartz

Unidentified translucent mineral fragment, possibly quartz

Likely quartz (SiO₂), though the photograph is insufficient for confident identification

Greenstone / Serpentinite

Serpentine-group / Altered Mafic Rock

Iron-rich quartz pebble

Quartz (SiO₂) with iron-oxide staining or inclusions; exact identification is uncertain from the photo

Tumbled quartz pebble (probable)

Quartz, silicon dioxide (SiO₂), possibly milky quartz or quartz-rich river stone

Likely milky quartz

Quartz (silicon dioxide, SiO₂)

Quartz crystal-bearing rock

Quartz (SiO₂), likely a milky/clear quartz vein specimen

Prasiolite

Silicon Dioxide (SiO2)

Iron-stained Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Rose quartz

Quartz (silicon dioxide, SiO₂), pink variety

Bronzite

Enstatite (magnesium iron silicate), (Mg,Fe2+)SiO3

Star Sapphire

Corundum (Al2O3) with Rutile inclusions

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Black Tourmaline (Schorl)

Schorl (Sodium iron silicate hydroxide boron silicate); NaFe3Al6(BO3)3Si6O18(OH)4

Garnet

Almandine formula: Fe3Al2(SiO4)3

Milky Quartz with Matrix

Silicon Dioxide (SiO2)

Milky quartz-rich rock

Quartz, SiO₂; possibly quartzite or massive vein quartz

Quartz vein rock (milky quartz)

Milky quartz, SiO₂; likely quartz-rich vein material in altered host rock

Serpentinite

Serpentinite (Hydrated magnesium iron phyllosilicate)

Garnet fragments

Garnet-group silicate, most likely almandine–pyrope or spessartine; composition varies, commonly (Fe,Mg,Mn)₃Al₂Si₃O₁₂

Massive Quartz with Host Rock

Silicon Dioxide (SiO2)

Gold-Bearing Quartz Ore

Crystalline Silicon Dioxide (SiO2) with Trace Aurum (Au)