GRAY

Acanthite
Andradite (Garnet)
Anglesite
Anhydrite
Antimony
Apatite
Aragonite
Argentite
Arsenic
Arsenopyrite
Augite
Barite
Beryl
Bismuth
Borax
Calcite
Celestine
Celsian (Feldspar)
Cerussite
Chalcedony
Chrysoberyl
Corundum
Cristobalite
Diamond
Diopside
Dolomite
Enstatite
Epsomite
Fluorite
Galena
Garnet
Glauberite
Graphite
Grossular (Garnet)
Gypsum
Hafnon
Halite
Hedenbergite
Hematite
Hydrozincite
Hypersthene
Jadeite
Johannsenite
Kernite
Lead
Loellingite
Magnesite
Mercury
Microcline (Feldspar)
Olivine
Opal
Orthoclase (Feldspar)
Pectolite
Phosgenite
Pitchblende (Uraninite)
Platinum
Pyromorphite
Quartz
Rammelsbergite
Rhodochrosite
Safflorite
Sanidine (Feldspar)
Serpentine
Siderite
Silver
Smithsonite
Sphalerite
Spodumene
Stibarsen
Strontianite
Tellurium
Tephroite
Thenardite
Topaz
Tourmaline
Tremolite
Ulexite
Uraninite
Vanadinite
Witherite
Wollastonite
Zircon

Many more to come soon!