Synthetic (Ceramic)

Pyrite-bearing quartz vein rock

Pyrite (FeS₂) in quartz, possibly with iron-oxide weathering products

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Black Star Diopside

Diopside (CaMgSi2O6) with Magnetite inclusions

Quartz (Milky or Iron-Stained)

Silicon Dioxide (SiO2)

Quartz Pebble (Sea Glass-like texture)

Silicon Dioxide (SiO2)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Feldspar (Orthoclase / Alkali Feldspar)

KAlSi3O8 (Potassium Feldspar / Orthoclase)

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Quartz (Bull Quartz)

Silicon Dioxide (SiO2)

Quartz (Milk or Ice Quartz)

Silicon Dioxide (SiO2)

Milky Quartz (Water-worn Pebble)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Green Kyanite

Kyanite (Al2SiO5)

Chert (and/or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz / Milky Quartz

Silicon Dioxide (SiO2)

Granitic Pegmatite

Granite Pegmatite (principally KAlSi3O8, SiO2, and KAl2(AlSi3O10)(OH)2)

Quartz crystal pendant

Quartz (silicon dioxide, SiO₂), likely rock crystal or milky quartz

Rounded quartz-rich pebble

Likely milky quartz (SiO₂), possibly quartzite or a quartz-rich river pebble

Milky quartz with iron staining

Quartz, silicon dioxide (SiO₂)

Quartzite pebble with Mafic inclusions

Quartzite (SiO2)

Plagioclase Feldspar (specifically Albite/Oligoclase)

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

Blue Kyanite

Kyanite (Al2SiO5)

Psilomelane (Black Hematite/Manganese Ore)

Barium Manganese Oxide (Formula: BaMn9O18(OH)4)

Kyanite (within Quartz)

Kyanite (Al2SiO5) in crystalline Quartz base (SiO2)

Quartzite

Quartzite (composed primarily of SiO2)

Milky quartz vein fragment

Quartz (silicon dioxide, SiO₂), massive/microcrystalline variety

Milky Quartz (with trace inclusions)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Lepidolite Ore

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Iron-stained quartz (likely quartzite or quartz-rich rock)

Quartz, silicon dioxide (SiO₂), with iron-oxide staining

Milky quartz with iron-oxide staining

Quartz, silicon dioxide (SiO₂), likely massive or coarsely crystalline; brown areas are limonite/goethite staining

Milky quartz

Quartz (silicon dioxide, SiO₂)

Chert (Nodule)

Silicon Dioxide (SiO2)

Rough Quartz (with Feldspar inclusions)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Milky quartz (rough crystal)

Quartz, silicon dioxide (SiO₂)

Milky quartz (quartz-rich rock)

Quartz, silicon dioxide (SiO₂); likely massive quartz with minor iron-stained impurities

Milky quartz

Quartz (SiO₂), likely massive milky quartz

Milky quartz with iron-oxide staining

Quartz (silicon dioxide, SiO₂)