RAITE (Hydrated Sodium Calcium Manganese Titanium Iron Silicate Hydroxide)
RAMMELSBERGITE (Nickel Arsenide)
RAMSDELLITE (Manganese Oxide)
REALGAR (Arsenic Sulfide)
RED BERYL (Beryllium Aluminum Silicate)(Information)
RHABDOPHANE (Hydrated Cerium Lanthanum Neodymium Phosphate)
RHODIZITE (Potassium Cesium Beryllium Aluminum Borate)
RHODOCHROSITE (Manganese Carbonate)(Information)
Rhodochrosite on Marmatite
RHODONITE (Manganese Iron Magnesium Calcium Silicate)
RICHTERITE (Sodium Calcium Magnesium Iron Silicate Hydroxide)
ROCK_CRYSTAL (variety of Quartz- Silicon Oxide)
ROMANECHITE (Hydrated Barium Manganese Oxide)
ROSASITE (Copper Zinc Carbonate Hydroxide)
ROSE_QUARTZ (variety of Quartz- Silicon Oxide)( Information )
ROQUESITE (copper indium sulfide) (Group)
RUBY (Variety of Corundum - Aluminum Oxide)
RUTILE (Titanium Oxide)
RUTILATED QUARTZ (Information)