Man Made Metamorphic Style Composite

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Quartzite

Quartzite (composed primarily of SiO2)

Granite

Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).

Black Pearl (Tahitian Type)

Aragonite / Conchiolin composite (CaCO3)

Quartz

Silicon Dioxide (SiO2)

Blue Apatite

Fluorapatite / Chlorapatite [Ca5(PO4)3(F,Cl,OH)]

Peacock Ore

Bornite (Cu5FeS4) or Chalcopyrite treated with acid

Schist

N/A (a rock type, not a mineral formula)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Gneiss

Gneissic Metamorphic Rock

Yellow Quartzite River Stone

Quartzite (SiO2)

Quartzite river stone

Quartzite (SiO2 silicon dioxide)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

River Rock (Quartzite/Chert conglomerate)

Quartzite (SiO2)

Pink feldspar fragment (probable orthoclase or microcline)

Potassium feldspar, KAlSi₃O₈

Polished serpentine pebble

Serpentinite, chiefly serpentine-group minerals (chrysotile, lizardite, antigorite)

Milky quartz (likely quartz-rich rock)

Quartz, silicon dioxide (SiO₂)

Clear quartz (likely quartz crystal fragment)

Quartz, silicon dioxide (SiO₂)

Crushed Limestone

Calcium Carbonate (CaCO3)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Quartzite

Quartzite (mostly SiO2)

Druzy Quartz on Vesicular Basalt

Silicon Dioxide (SiO2) in an extrusive Mafic igneous host rock

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Schist

Schist

Granite Gneiss

Felsic Gneiss (composed of Quartz, Feldspar, and Biotite)

Grey Agate (Banded Chalcedony)

Agate (Silicon Dioxide - SiO2)

Milky quartz–rich rock

Quartz (SiO₂), likely massive milky quartz with minor dark inclusions

Granite

Granite (a plutonic rock)

Map Jasper (Grey Picasso Jasper)

Silicon Dioxide (SiO2) with impurities

Magnetite-rich iron ore

Magnetite (Fe₃O₄), possibly with hematite and silicate matrix

Quartz (likely)

Quartz (SiO2 - Silicon Dioxide)

Seraphinite

Clinochlore (a variety of the chlorite group)

Pebble

Clast (specifically a granule or small pebble)

Blue Quartzite (likely dyed)

Silicon dioxide (SiO2) with likely color treatment

Gneiss

Gneiss

Milky quartz cluster

Quartz (silicon dioxide, SiO₂), likely druzy or microcrystalline quartz

Gneiss with Iron Staining and Sulfide Mineralization

Metamorphic Gneiss / Amphibolite with Iron/Sulfide Oxidation

Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)

Chalcedony (SiO₂)

Citrine

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine/Lemon Quartz)

Silicon Dioxide (SiO2)

Citrine Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)